BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:On the way to a world-competitive fission fragment facility at SAR AF DTSTART;VALUE=DATE-TIME:20190719T150000Z DTEND;VALUE=DATE-TIME:20190719T153000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-940@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Israel Mardor (Soreq Nuclear Research Center)\nCombi ning an Ion Catcher\, which is based on the cryogenic stopping cell that i s being designed for the Low Energy Branch at the Super-FRS at FAIR [1]\, with the high-power accelerator SARAF II\, currently under construction at Soreq NRC [2]\, and a liquid lithium target [3] will enable creating a re search facility for neutron-rich exotic isotopes based on high-energy neut rons induced fission. I will outline a conceptual design and possible impl ementation of the Ion Catcher at SARAF\, along with rate estimations\, whi ch indicate that such a facility will be potent in a world competitive man ner\, with neutron-rich isotope production rates higher than much larger f uture facilities such as FRIB.\n\nReferences:\n[1] T. Dickel et al.\, “C onceptional design of a novel next-generation cryogenic stopping cell for the Low-Energy Branch of the Super-FRS”\, Nucl. Instr. and Meth. B 376 2 16-220 (2016)\n[2] I. Mardor et al.\, “The Soreq Applied Research Accele rator Facility (SARAF): Overview\, research programs and future plans”\, Eur. Phys. J. A (2018) 54: 91\n[3] S. Halfon et al.\, “Note: Proton irr adiation at kilowatt-power and neutron production from a free-surface liqu id-lithium target”\, Rev. Sci. Inst. 85\, 056105 (2014) \n\nemail: mardo r@tauex.tau.ac.il\n\nhttps://nyx.physics.mcgill.ca/event/149/contributions /940/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/940/ END:VEVENT BEGIN:VEVENT SUMMARY:Present status and future plans for slow and stopped beams in RIKE N DTSTART;VALUE=DATE-TIME:20190719T133000Z DTEND;VALUE=DATE-TIME:20190719T140000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-941@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Peter Peter Schury ()\nThe accelerator complex at RI KEN's Nishina Center for Accelerator Based Science offers presently unpara lleled intensity and variety of radioactive ion beams. The accelerator co mplex employs multiple facilities utilizing in-flight fission and fragment ation\, fusion\, and multi-nucleon transfer reactions to provide radioacti ve ion beams spanning the table of isotopes from $^{6}$He to $^{294}$Og. In order to make these beams viable for low-energy experimental techniques (e.g. ion traps) requires the use of high-pressure gas cells. Several su ch systems are in various states of readiness.\nThe SHE-mass gas cell\, lo cated after the gas-filled recoil ion separator GARIS-II has been successf ully operated since 2016. Recent modifications of the SHE-mass system wil l be discussed and select results presented.\nA medium-size gas cell is ne aring construction for use in symbiotic measurements. It will be used as a beam dump for in-beam gamma-ray experiments and in conjunction with a mul ti-reflection time-of-flight mass spectrograph will enhance the in-beam ga mma-ray experiments. The design of the system and its planned usage will be discussed.\nTo provide access to neutron-rich heavy isotopes which are difficult to access via in-flight fission and fragmentation\, the KEK Isot ope Separation System (KISS) utilizes multi-nucleon transfer reactions. T he transfer products are stopped and neutralized in an argon-filled gas ce ll. Atoms of a desired element can be selectively re-ionized using a two- color resonance laser ionization scheme. Ions of the selected element are accelerated to 30 keV and isobarically purified via a magnetic dipole pri or to being delivered to a measurement station. A new "gas-cell cooler-bu ncher'' has recently been installed to efficiently convert the 30 keV beam to be compatible with ion traps. The system will be described and its pe rformance reported.\n\nhttps://nyx.physics.mcgill.ca/event/149/contributio ns/941/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/941/ END:VEVENT BEGIN:VEVENT SUMMARY:Addressing the systematics in phase-imaging ion-cyclotron-resonanc e measurements at the Canadian Penning Trap mass spectrometer DTSTART;VALUE=DATE-TIME:20190718T153000Z DTEND;VALUE=DATE-TIME:20190718T160000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-942@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Dwaipayan Ray (University of Manitoba)\nPhase-imagin g ion-cyclotron-resonance (PI-ICR) is a novel technique for determining th e cyclotron frequency ($\\nu_{c}$) of an ion trapped in a Penning trap. Fi rst developed by the SHIPTRAP group at GSI [1]\, this technique relies on measuring the radial phase a trapped ion accumulates over a period of time . At the Canadian Penning Trap mass spectrometer (CPT) in Argonne National Laboratory (ANL)\, PI-ICR is currently employed [2\,3]. The measurement c ampaigns and extensive tests over the last few years have revealed a numbe r of systematics relating to the alignment between the magnetic field and ejection optics\, the stability of the Penning trap electric field\, and t he initial magnetron motion of the ions [4]. These systematics and the eff orts to address them will be presented. \n\nThis work is supported by Natu ral Sciences and Engineering Research Council (NSERC\, Canada) under Appli cation Number SAPPJ-2018-00028\, U.S. Department of Energy (DOE)\, Office of Nuclear Physics under Contract Number DE-AC02-06CH11357(ANL)\, and Faci lity for Rare Isotope Beams - China Scholarship Council (FRIB-CSC) Fellows hip under Grant Number 201704910964.\n \n\n\n[1] S. Eliseev *et al.*\, Ap pl. Phys. B 114 (2014) 107.\n[2] R. Orford\, N. Vassh *et al.*\, Phys. Re v. Lett. 120 (2018) 262702.\n[3] D.J. Hartley\, F.G. Kondev\, R. Orford * et al.*\, Phys. Rev. Lett. 120 (2018) 182502.\n[4] R. Orford\, PhD thesis \, McGill University\, Canada (2018).\n\nhttps://nyx.physics.mcgill.ca/eve nt/149/contributions/942/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/942/ END:VEVENT BEGIN:VEVENT SUMMARY:Efficient Ion Thermalization and Mass Spectrometry of (Super-)Heav y Elements at SHIPTRAP DTSTART;VALUE=DATE-TIME:20190718T150000Z DTEND;VALUE=DATE-TIME:20190718T153000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-918@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Oliver Kaleja (MPIK Heidelberg\, JGU Mainz\, GSI Dar mstadt)\nThe quest for the *island of stability*\, a region of nuclides wi th enhanced stability around proton and neutron numbers $Z\\approx 114-126 $ and $N\\approx 184$\, respectively\, is at the forefront of nuclear phys ics. The survival of superheavy elements is intimately linked to nuclear s hell effects\, which can be experimentally probed by mass measurements. Ex periments around this region are hampered by extremely low production rate s of down to few ions per month. Nonetheless\, the Penning-trap mass spect rometer SHIPTRAP\, located at the GSI in Darmstadt\, Germany\, has shown t hat direct high-precision measurements of atomic masses of $_{102}$No and $_{103}$Lr isotopes around the deformed shell closure $N=152$ are feasible and provide indispensable knowledge on binding energies\, shell effects a nd yield important anchor-points on $\\alpha$-decay chains\, affecting abs olute mass values up to the heaviest elements.\n\nTo continue this groundb reaking program and to proceed towards heavier and more exotic nuclides\, the drop in production rate has to be accomodated by several improvements. The Penning-trap system was recently relocated\, allowing to integrate a second-generation gas-stopping cell\, operating at cryogenic temperatures. Its stopping efficiency was optimized using the SRIM simulation software\ , and its purity was recently investigated using recoil-ion sources. In ad dition\, the Phase-Imaging Ion-Cyclotron-Resonance (PI-ICR) technique was developed\, increasing the sensitivity of mass measurements. To fully expl oit its enhanced mass resolving power required improving the temporal stab ility of the electric and magnetic fields. Furthermore\, its applicabilty in low-rate measurements\, accumulating only few ions in total\, yet had t o be proven.\n\nIn the SHIPTRAP experimental campaign in summer 2018\, we extended direct high-precision Penning-trap mass spectrometry into the reg ion of the heaviest elements using the PI-ICR technique. For the first tim e\, direct mass measurements of $^{251}$No\, $^{254}$Lr and the superheavy nuclide $^{257}$Rf were performed with rates down to one detected ion per day. Despite lowest rates the PI-ICR technique allowed resolving the isom eric states $^{251m\,254m}$No and $^{254m\,255m}$Lr from their respective ground states with mass resolving powers of up to 10.000.000 and to accura tely determine their excitation energies\, which had previously been deriv ed only indirectly via decay spectroscopy.\n\nIn this contribution an over view of the technical developments and the recent results will be given.\n \nhttps://nyx.physics.mcgill.ca/event/149/contributions/918/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/918/ END:VEVENT BEGIN:VEVENT SUMMARY:Design\, optimization and commission of a multi-reflection time-of -flight mass analyzer at IMP/CAS DTSTART;VALUE=DATE-TIME:20190717T133000Z DTEND;VALUE=DATE-TIME:20190717T140000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-947@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Yongsheng Wang (Institute of Modern Physics\, Chines e Academy Science)\nA multi-reflection time-of-flight mass analyzer is bei ng constructed for isobaric separation and mass measurement at IMP/CAS (In stitute of Modern Physics\, Chinese Academy Science). A new method includi ng two sub-procedures\, global search and local refinement\, has been deve loped for the design of MRTOF mass analyzer. The method can be used to opt imize the parameters of MRTOF-MS both operating in mirror-switching mode a nd in-trap-lift mode. By using this method\, an MRTOF mass analyzer\, in w hich each mirror consists of five cylindrical electrodes\, has been design ed. In the mirror-switching mode\, the maximal mass resolving power has be en achieved to be 1.3 × 10$^5$ with a total time-of-flight of 6.5 ms for the ion species of $^{40}$Ar$^{1+}$ [1]\, and in the in-trap-lift mode\, i t is 1.6 × 10$^5$ with a total time-of-flight of 6.4 ms [2]. The simulati on also reveals the relationships between the resolving power and the pote ntials applied on the mirror electrodes\, the lens electrode and the drift tube.\nThis MRTOF-MS has been constructed and is being commissioning now. The preliminary test results show that it works [2].\nIn this conference\ , we will present the design details\, optimization method and the test re sults obtained. \n\n**References:**\n[1] Y.L. Tian\, Y.S. Wang\, J.Y. Wang \, et al.\, Int. J. Mass Spectrom. 408\, 28–32 (2016).\n[2] Jun-Ying Wan g\, Yu-Lin Tian\, Yong-Sheng Wang\, et al.\, Nucl. Instrum. Meth. B\, (201 9).\n\ne-mail: yswang629@impcas.ac.cn\n\nhttps://nyx.physics.mcgill.ca/eve nt/149/contributions/947/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/947/ END:VEVENT BEGIN:VEVENT SUMMARY:Actinide beams by light-ion induced fusion-evaporation for mass-\, decay- and optical spectroscopy at IGISOL DTSTART;VALUE=DATE-TIME:20190716T133000Z DTEND;VALUE=DATE-TIME:20190716T140000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-934@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Ilkka Pohjalainen (University of Jyväskylä)\nThe p roduction of actinide ion beams has become a focus of recent efforts at th e IGISOL facility of the Accelerator Laboratory\, University of Jyväskyl ä\, especially aimed at the measurement of nuclear properties of heavy el ements using high-resolution optical spectroscopy [1]. The first successfu l proof-of-principle on-line experiment for the production of actinides fr om a light-ion fusion-evaporation reaction has recently been performed wit h protons on $^{232}$Th targets. Several alpha-active reaction products we re detected\, reaching as neutron deficient as $^{224}$Pa through the $^{2 32}$Th(p\, 9n)$^{224}$Pa with a 60 MeV primary beam. By detection of gamma -rays in coincidence with the alpha-decay\, new information on the decay r adiation has been obtained on nuclei including $^{226}$Pa.\n\nDirect detec tion of long lived actinides such as $^{229}$Th which is of special intere st due to the extremely low-energy isomer [2]\, was not possible due to lo w alpha-activity as well due to low $Q_{EC/\\beta^-}$ values\, rendering s eparation of isotopes even with high resolution Ramsey cleaning with the P enning trap ineffective. Therefore\, the novel Phase-Imaging Ion Cyclotron Resonance (PI-ICR) method [3] at JYFLTRAP is to be used for for a direct yield determination of long-lived isotopes in an upcoming experiment. This will also allow direct high-precision mass measurements creating new anch or points in the mass network calculations which currently rely on long ch ains of alpha decays in the actinide region of the nuclear chart. \n\nAn i mportant aspect of these developments has been related to target manufactu ring. In addition to metallic thorium targets\, several new $^{232}$Th tar gets manufactured by a novel Drop-on-Demand inkjet printing method [4] wer e successfully tested. These targets were provided by the Nuclear Chemistr y Institute of Johannes Gutenberg-Universität Mainz who will now provide several new targets from other more exotic actinides such as $^{233}$U or $^{237}$Np. With these new targets we expect to access several new isotope s in the neutron-deficient actinide region for decay and optical spectrosc opy as well as for mass measurements.\n\n[1] A. Voss et al.\, Phys. Rev. A \, 95 (2017) 032506.\n[2] L. von der Wense et al.\, Nature\, 533 (2016) 47 .\n[3] D. Nesterenko et al.\, Eur. Phys. J. A\, 54 (2018) 154.\n[4] R. Haa s. et al.\, Nucl. Instr. Meth. A\, 874 (2017) 43.\n\nhttps://nyx.physics.m cgill.ca/event/149/contributions/934/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/934/ END:VEVENT BEGIN:VEVENT SUMMARY:Conference Check In DTSTART;VALUE=DATE-TIME:20190715T220000Z DTEND;VALUE=DATE-TIME:20190715T223000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-949@nyx.physics.mcgill.ca DESCRIPTION:https://nyx.physics.mcgill.ca/event/149/contributions/949/ LOCATION:Thomson House Restaurant URL:https://nyx.physics.mcgill.ca/event/149/contributions/949/ END:VEVENT BEGIN:VEVENT SUMMARY:Welcome Reception DTSTART;VALUE=DATE-TIME:20190715T223000Z DTEND;VALUE=DATE-TIME:20190716T000000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-719@nyx.physics.mcgill.ca DESCRIPTION:https://nyx.physics.mcgill.ca/event/149/contributions/719/ LOCATION:Thomson House Restaurant URL:https://nyx.physics.mcgill.ca/event/149/contributions/719/ END:VEVENT BEGIN:VEVENT SUMMARY:Recent results from the FRS Ion Catcher DTSTART;VALUE=DATE-TIME:20190718T131000Z DTEND;VALUE=DATE-TIME:20190718T133000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-948@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Ivan Miskun (1 II. Physikalisches Institut\, Justus- Liebig-Universität Gießen\, 35392\, Gießen\, Germany 2 GSI Helmholtzze ntrum für Schwerionenforschung GmbH\, 64291\, Darmstadt\, Germany)\nThe F RS Ion Catcher setup [1] is used for thermalization and high-resolution me asurements of exotic nuclei produced at relativistic energies of up to 1 G eV/u at the fragment separator (FRS) at GSI. It consists of a cryogenic ga s-filled stopping cell (CSC)\, an RFQ beamline and a multiple-reflection t ime-of-flight mass-spectrometer (MR-TOF-MS)\, which can be used for mass m easurements with mass accuracies down to $6\\cdot10^{-8}$ [2] and for the production of isobarically and isomerically clean beams. \nOver the last y ears\, several technical improvements and upgrades were implemented to the setup. New techniques for enhancing the selectivity of ion transport base d on ion mobility and dissociation of molecular contaminants were develope d. The RFQ beamline was expanded and upgraded with improved differential p umping\, a mass filter and a laser ablation carbon cluster ion source. The areal density of the CSC was increased to 10 mg/cm$^2$. A novel method fo r half-lives and branching ratios measurements [3] using the CSC as an ion trap for controllable storing of ions was developed and demonstrated. \nI n addition\, the progress on the technical design of the CSC for the Low-E nergy Branch of the Super-FRS at FAIR will be reported.\n \nReferences: \n [1] W. R. Plass et al.\, Nucl. Instrum. Methods B\, 317 (2013)\n[2] S. Ay et et al.\, accepted to Phys. Rev. C\, arXiv:1901.11278 (2019) \n[3] I. M iskun et al.\, submitted to Eur. Phys. Journal A\, arXiv:1902.11195 (2019) \n\ne-mail: Ivan.Miskun@physik.uni-giessen.de\n\nhttps://nyx.physics.mcgi ll.ca/event/149/contributions/948/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/948/ END:VEVENT BEGIN:VEVENT SUMMARY:Single Barium Atom Detection in Solid Xenon for the nEXO Experimen t DTSTART;VALUE=DATE-TIME:20190716T200000Z DTEND;VALUE=DATE-TIME:20190716T202000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-946@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Christopher Chambers (McGill University)\nThe propos ed nEXO experiment is a tonne-scale liquid xenon time projection chamber\, designed to search for neutrinoless double beta decay in xenon-136 [1]. A critical concern for any rare decay search is reducing or eliminating bac kgrounds that will interfere with the signal [2]. A powerful background di scrimination technique is the positive identification (“tagging”) of t he decay daughter\, in this case barium.\n \nA technique being developed i n the nEXO collaboration is the trapping and extraction of the Ba daughter ion in solid xenon on a cryogenic probe\, then using fluorescence spectro scopy to tag\, i.e.\, identify the barium atom. Individual barium atoms\, implanted into Xe ice as Ba ions\, have been imaged in solid xenon\, and the 619 nm emission of atomic barium in solid xenon has been assigned to s ingle vacancy trapping sites [3].\n\n1. Al Kharusi et al. (nEXO Collaborat ion)\, arXiv:1805.11142 *[physics.ins-det]* (2018).\n2. Albert et al. (nEX O Collaboration)\, *Phys. Rev. C* **97**\, 065503 (2018).\n3. Chambers et al. (nEXO Collaboration)\, *Nature* **569**\, 203-207 (2019).\n\nhttps://n yx.physics.mcgill.ca/event/149/contributions/946/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/946/ END:VEVENT BEGIN:VEVENT SUMMARY:SIMULATION VS. PERFORMAMCE OF THE TRIUMF CANREB RFQ COOLER-BUNCHER DTSTART;VALUE=DATE-TIME:20190718T195000Z DTEND;VALUE=DATE-TIME:20190718T201000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-945@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Chris Charles (TRIUMF)\nThe CANadian Rare-isotope la boratory with Electron Beam ion source (CANREB) project at TRIUMF [1] prod uces a large variety of rare radioactive and stable isotope beams for fund amental research. Essential to CANREB is a new radiofrequency quadrupole ( RFQ) cooler-buncher [2] operating in grade 5.0 helium gas at 3 MHz\, 1.2 k V$_{pp}$ (q $\\sim$ 0.2) with 60-70 W input RF power. The RFQ is designed to (A) accept beams with <100 pA currents at <60 keV energies\, and (B) de liver cooled and bunched beams <10$^6$ ions/bunch at 100 Hz with >90$\\%$ efficiency\, <10 eV energy spread\, and short <1 us time-spread. Commissio ning tests with picoamp beams of 30 keV $^{133}$Cs$^{+1}$ (r $\\sim$ 5 mm\ , angular spread $\\sim$ 10 mrad) in $\\sim$ 5 mtorr helium yield >90$\\%$ transmission through the RFQ with >80$\\%$ bunching efficiency. Simulatio ns agree with $^{133}$Cs$^{+1}$ performance characteristics. Here we discu ss simulation of beam properties in the RFQ obtained with SIMION to actual performance for $^{133}$Cs$^{+1}$\, $^{85}$Rb$^{+1}$ and other isotopes o f interest\, over a range of energies. Preliminary results indicate q-valu es for RFQ operation with >90$\\%$ transmission occur for 60 keV: $^{133} $Cs$^{+1}$ = 0.10-0.25\, $^{85}$Rb$^{+1}$ = 0.09\, and $^{133}$Cs$^{+1}$ ( 18.5 keV) = 0.14-0.30\, $^{85}$Rb$^{+1}$ (29 keV) = 0.12-0.16.\n\nReferenc es:\n\n[1] The CANREB project for charge state breeding at TRIUMF. F. Ames \, R. Baartman\, B. Barquest\, C. Barquest\, M. Blessenohl\, J. R. Crespo López-Urrutia\, J. Dilling\, S. Dobrodey\, L. Graham\, R. Kanungo\, M. Ma rchetto\, M. R. Pearson\, and S. Saminathan. Proceedings of the “17th In ternational Conference on Ion Sources”\, Oct. 15-20\, 2017\, Geneva Swit zerland\, AIP Conf. Proc. 2011\, 070010-1–070010-3\; (2018).\n\n[2] B.R. Barquest\, J.C. Bale\, J. Dilling\, G. Gwinner\, R. Kanungo\, R. Krucken\ , M.R. Pearson. Development of a new RFQ beam cooler and buncher for the C ANREB project at TRIUMF. NIMB 376 (2016)\, 207-210.\n\n\ne-mail: ccharles @triumf.ca\n\nhttps://nyx.physics.mcgill.ca/event/149/contributions/945/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/945/ END:VEVENT BEGIN:VEVENT SUMMARY:Barium Ion Transport in High Pressure Xenon Gas using RF Carpets DTSTART;VALUE=DATE-TIME:20190716T153000Z DTEND;VALUE=DATE-TIME:20190716T160000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-944@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Katherine Woodruff ()\nA background-free measurement of neutrinoless double beta decay can be achieved\nwith the detection of the daughter nucleus. Methods to image the daughter\nbarium ion in the dec ay of xenon-136 are being developed for use in high\npressure gas time pro jection chambers by the NEXT collaboration. A major\nremaining challenge i s the transport of the barium ion to a small imaging\nregion within the de tector. In this talk I will discuss the plans for testing\nRF carpet perfo rmance in high pressure gas\, early simulation results\, and \nexperimenta l tests of RF high voltage behavior in high pressure systems. I will\nalso discuss our studies of ion drift properties in DC fields in high pressure \ngases.\n\nhttps://nyx.physics.mcgill.ca/event/149/contributions/944/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/944/ END:VEVENT BEGIN:VEVENT SUMMARY:Barium Tagging in High Pressure Xenon Gas DTSTART;VALUE=DATE-TIME:20190716T150000Z DTEND;VALUE=DATE-TIME:20190716T153000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-943@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Ben Jones (UTA)\nThe identification of a single bari um ion in coincidence with an energy deposit measured with a precision of 1% in xenon is widely recognized as an unambiguous signature of neutrinole ss double beta decay. The detection of single ions in tons of gas or liqu id xenon\, however\, is a major experimental challenge. In this talk I wi ll discuss barium tagging methodologies based on single molecule fluoresce nce imaging adapted to high pressure xenon gas time projection chambers. Recent advances in ion sensing chemistry and gas phase microscopy will be presented\, followed by a discussion of the subsequent R&D steps planned b y the NEXT collaboration to enable an ultra-low background\, barium taggin g neutrinoless double beta decay technology.\n\nhttps://nyx.physics.mcgill .ca/event/149/contributions/943/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/943/ END:VEVENT BEGIN:VEVENT SUMMARY:MORA project and optimization of transparent ion trap geometry DTSTART;VALUE=DATE-TIME:20190717T152000Z DTEND;VALUE=DATE-TIME:20190717T154000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-939@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Meriem BENALI (LPC Caen\, France )\nThe MORA (Matter 's Origin from the RadioActivity of trapped and oriented ions) project [1] is part of the research on CP violation that could explain the matter-ant imatter asymmetry observed in the universe\, through the measurement of th e so-called D correlation. MORA uses an innovative in-trap orientation met hod which combines the high trapping efficiency of a transparent Paul trap with laser orientation techniques. The MORA setup will permit to reach pr ecision on D down to a few $10^{-5}$\, which allows to probe the Final Sta te Interactions (FSI) effects for the first time.\n Within the framework o f this project\, a three-dimensional Paul trap (MORATrap) geometry has b een optimized to broad the quadrupolar region\, where the contribution of higher order harmonics is reduced. MORATrap is composed of three conic rin g pairs with a mid-plane symmetry\, its geometry is inspired from the exi sting transparent Paul trap\, LPCTrap [2]. Our trap optimization was carri ed out by minimizing high order harmonics and maximizing the quadrupolar t erm in the spherical harmonics expansion of the generated potential in the trap center. Our simulation is based on solving Laplace's equation with t he AXIELECTROBEM software developed at LPC Caen coupled to some $\\chi^2$ minimization.\n\n\n[1] P. Delahaye et al.\, arXiv:1812.02970\, proceedings of the TCP 2018 conference\, to appear in Hyp. Int.\n[2] P.~Delahaye et al.\, arXiv:1810.09246 [physics.ins-det]\, submitted to EPJA.\n\nhttps://n yx.physics.mcgill.ca/event/149/contributions/939/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/939/ END:VEVENT BEGIN:VEVENT SUMMARY:A compact gas filled linear Paul trap for CRIS experiments. DTSTART;VALUE=DATE-TIME:20190716T182000Z DTEND;VALUE=DATE-TIME:20190716T184000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-938@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Ben Cooper (University of Manchester)\nThe CRIS tech nique (Collinear Resonance Ionisation Spectroscopy) has been shown to be a n efficient method for accessing fundamental nuclear properties of exotic isotopes [1]. The technique can be applied to stable ion beams produced vi a laser ablation [2] which are pulsed due to the method of production. How ever\, with radioactive cases produced at the ISOLDE (Isotope separator On -line) facility at CERN\, a gas filled linear Paul trap is required for cr eating ion bunches. Currently\, radioactive ion beams are produced via pro ton impact with a suitable target at ISOLDE. The resulting beam is then tr apped\, cooled\, and bunched using the ISCOOL device following mass separa tion. The ion bunches are then directed to the CRIS setup where they are p repared for laser spectroscopy experiments. The technique has been shown t o reveal properties such as nuclear spins\, magnetic and electric quadrupo le moments\, and isotopic variations in the nuclear mean square charge rad ii. Measurement of these properties is made possible with ion beams that h ave been bunched with reduced emittance. The CRIS method has so far measur ed fundamental nuclear properties of neutron deficient Francium [3]\, and neutron rich radium [4] isotopes\, among others. We envisage significant improvements to the CRIS technique following the installation of an indepe ndent gas filled linear Paul trap at ISOLDE as an alternative to the ISCOO L device. This would reduce set up times prior to time constrained experim ents at the ISOLDE facility. It would enable constant optimisation of beam transport and quality. It would also trivialise switching from a radioact ive beam to a stable reference isotope from our independent offline ion so urce. We provide an overview of the work completed since the first prototy pe was constructed and installed at the University of Manchester [5]\, whe re tests utilising a Ga ion source are ongoing. These tests include ion tr ansport and gas attenuation within the device. Spatial limitations require that the new device is compact (<80 cm in length). SIMION calculations es timate that a prototype device with a 20 cm rod length could achieve a tra pping efficiency of up to ~ 40% with a mean energy spread of ~ 4 eV. \n\n[ 1]: T.E Cocolios et al. Nucl\, Inst\, Methods in Phys Res B\, 317 (2013) [2]: R . F. Garcia Ruiz et al. Phys. Rev. X 8\, 041005 (2018) [ 3]: K.T. Flanagan et al. Phys rev lett 111\, 212501 (2013) [4]: K. M. Lynch et al. Phys. Rev. C 97\, 024309 (2018) [5]: B. S. Cooper et al. Hyperfine Interact\, 240:52 (2019)\n\nhttps://ny x.physics.mcgill.ca/event/149/contributions/938/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/938/ END:VEVENT BEGIN:VEVENT SUMMARY:Development of offline ion source for collinear laser spectroscopy at the SLOWRI facility in RIKEN DTSTART;VALUE=DATE-TIME:20190716T184000Z DTEND;VALUE=DATE-TIME:20190716T190000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-937@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Minori TAJIMA (RIKEN Nishina Center)\nWe have prepar ed an offline ion source mainly for a planned collinear laser spectroscopy of RI beams at the SLOWRI facility in RIKEN. It was designed to provide l ow-emittance ion beams including refractory elements such as Zr\, by combi ning laser ablation of a solid target in He gas and RF ion guide system [1 ]. We have connected the ion source to a test beamline and observed about $10^7$ singly charged ions per laser pulse ($\\le 10$ Hz) extracted at 10 keV. The current situation including tests to evaluate the performance wil l be presented.\n\n**References:**\n[1] M. Wada *et al*.\, Nucl. Instrum. Methods Phys. Res. **B** 204\, 570 (2003).\n\ne-mail: mtajima@riken.jp\n\n https://nyx.physics.mcgill.ca/event/149/contributions/937/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/937/ END:VEVENT BEGIN:VEVENT SUMMARY:The ELI-IGISOL radioactive ion beam facility at ELI-NP DTSTART;VALUE=DATE-TIME:20190716T140000Z DTEND;VALUE=DATE-TIME:20190716T143000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-936@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Paul Constantin (ELI-NP (Romania))\nThe Extreme Ligh t Infrastructure for Nuclear Physics (ELI-NP) facility will make available in the near future two new photon installations: a high-power laser syste m and a high-brilliance gamma beam system\, which can be used together or separately.\nThe ELI-IGISOL project [1] will use the primary gamma beam to generate a Radioactive Ion Beam (RIB) via photofission in a stack of Uran ium targets placed at the center of a gas cell [2]. The particular technol ogy used for this gas cell is the High Areal Density with Orthogonal extra ction Cryogenic Stopping Cell (HADO-CSC) [3] featuring ion extraction orth ogonal to the primary beamline. The gas cell is coupled to a radio-frequen cy quadrupole for beam formation. The exotic neutron-rich nuclei will be separated\, and their mass measured\, by a high-resolution Multiple-Reflec tion Time-of-Flight (MR-ToF) mass spectrometer. The isomerically pure RIBs [4] obtained with the MR-ToF will be further measured by a β-decay tape station and a collinear laser spectroscopy station.\nThe latest developmen ts in the simulation and design of the gas cell are presented. We report b enchmark calculations of the production rates and of the extraction time a nd efficiency from the gas cell. Starting from these studies\, the optimal design of the cell and its state-of-the-art technologies is discussed. Va rious testing units for the HADO-CSC components that are being developed a t ELI-NP will be presented. \n\n 1. D.L. Balabanski et al.\, “Photofissi on Experiments at ELI-NP”\, *Rom. Rep. Phys.* **68**\, S621 (2016).\n 2. P. Constantin et al.\, “Design of the gas cell for the IGISOL facility at ELI-NP”\, *Nucl. Inst. Meth. B* **397**\, 1 (2017).\n 3. T. Dickel et al.\, “Conceptual design of a novel next-generation cryogenic stopping cell for the Low-Energy Branch of the Super-FRS”\, *Nucl. Inst. Meth. B* **376**\, 216 (2016).\n 4. T. Dickel et al.\, “First spatial separation of a heavy ion isomeric beam with a multiple-reflection time-of-flight ma ss spectrometer”\, *Phys. Lett. B* **744**\, 137 (2015).\n\nhttps://nyx. physics.mcgill.ca/event/149/contributions/936/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/936/ END:VEVENT BEGIN:VEVENT SUMMARY:Status of St. Benedict at the Nuclear Science Laboratory DTSTART;VALUE=DATE-TIME:20190717T150000Z DTEND;VALUE=DATE-TIME:20190717T152000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-935@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Daniel Burdette (University of Notre Dame)\nSt. Bene dict\, the Superallowed Transition Beta-Neutrino Decay-Ion-Coincidence Tra p\, is in development at the University of Notre Dame's Nuclear Science La boratory. This ion trapping system will be composed of three main compone nts. The first component will be a large-volume gas cell which will therm alize ions through collisions with a buffer gas\, coupled with a RF-funnel -based ion guide system followed by a sextupole ion guide (SPIG) for extra ction. Then\, a radiofrequency quadrupole (RFQ) will take the continuous b eam from the gas catcher and produce a cooled\, bunched beam for injection into a linear Paul trap. The Paul trap will hold the ions near rest until they decay\, and surrounding detectors will be used to determine the kine matics of the decay particles. The $\\beta$-decay spectrum can be extracte d from this information\, and used to determine the $\\beta$-$\\nu$ angula r correlation coefficient\, $a_{\\beta\\nu}$. This will allow for the det ermination of the Fermi to Gamow-Teller mixing ratio\, $\\rho$\, for membe rs of the ensemble of T=1/2 superallowed $\\beta$ decays whom have not had this quantity measured experimentally. The determination of $\\rho$ for t hese decays will allow for the calculation of a precision $\\text{V}_{\\te xt{ud}}$ value complementary to the current precision limit provided by su perallowed $0^+$$\\rightarrow0^+$ decays. The current status of the projec t will be presented. This work is funded by the National Science Foundatio n Major Research Instrumentation grant PHY-1725711.\n\nhttps://nyx.physics .mcgill.ca/event/149/contributions/935/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/935/ END:VEVENT BEGIN:VEVENT SUMMARY:Overview of progress at SMI-2019 DTSTART;VALUE=DATE-TIME:20190719T153000Z DTEND;VALUE=DATE-TIME:20190719T160000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-933@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Iain Moore (University of Jyväskylä)\nThis talk wi ll provide an overview of the field of Stopping and Manipulation of Ions a nd related topics based on the recent progress presented by the different contributions within SMI-2019. A final focus will aim to look towards the future and the puzzles and possibilities we may face in the coming years w hich will set the scene for the next conference.\n\nhttps://nyx.physics.mc gill.ca/event/149/contributions/933/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/933/ END:VEVENT BEGIN:VEVENT SUMMARY:The CISe project DTSTART;VALUE=DATE-TIME:20190716T193000Z DTEND;VALUE=DATE-TIME:20190716T200000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-932@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Julia Even (University of Groningen)\nGas-catchers a re widely used in experimental nuclear physics to slow down for precision measurements. Chemical reactions of the ions with impurities in the gas ca n affect the extraction efficiency. Thus\, there is lots of effort to keep the gas inside the catcher as clean as possible.\nOur aim is to explore t he potential of chemical reactions for Chemical Isobaric Separation (CISe) . We are currently building a new setup consisting of a gas-catcher and a commercial quadrupole Time-of-Flight mass-spectrometer. First studies in a hexapol collision cell have been performed to investigate the ion chemist ry of tin\, indium\, cadmium and silver.\nIn this contribution\, an overvi ew of the project will be presented.\n\nhttps://nyx.physics.mcgill.ca/even t/149/contributions/932/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/932/ END:VEVENT BEGIN:VEVENT SUMMARY:Characterization of supersonic jets for in-gas-jet laser ionizatio n spectroscopy at the IGLIS laboratory and of gas flow inside the ion guid e at the IGISOL-4 facility DTSTART;VALUE=DATE-TIME:20190718T180000Z DTEND;VALUE=DATE-TIME:20190718T182000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-931@nyx.physics.mcgill.ca DESCRIPTION:Speakers: ALEXANDRA ZADVORNAYA (University of Jyväskylä)\nNo ble gases such as argon and helium are utilized within the In-Gas Laser Io nization and Spectroscopy (IGLIS) [1] and Ion Guide Isotope Separation On- Line (IGISOL) [2] techniques to thermalize and transport nuclear reaction products\, which often have short lifetimes and small production yields. T o facilitate the spectroscopic studies of the properties of nuclear reacti on products\, thorough understanding and characterization of utilized gas flows are essential. Characterization was performed experimentally at both the IGLIS and IGISOL-4 laboratories and numerically using the Computation al Fluid Dynamics (CFD) Module of COMSOL Multiphysics.\n\nWith the in-gas- jet method\, an extension of the IGLIS technique\, the spectral resolution is improved by more than one order of magnitude in comparison to in-gas-c ell laser ionization spectroscopy [3]\, while maintaining a high efficienc y. This allows the determination of nuclear properties with higher precisi on. The flow parameters of such supersonic gas jets were characterized at the IGLIS laboratory at KU Leuven using Planar Laser Induced Fluorescence (PLIF) and will be discussed in the first part of this talk. The projected temperature associated (Doppler) broadening\, which can be attained with an upgraded in-gas-jet method\, was estimated to be about 140 MHz for the No isotopes. Moreover\, the numerical calculations were performed to obtai n temperature\, velocity and Mach number profiles of supersonic jets forme d by a de Laval nozzle. The experimental and numerical in-gas-jet results agreed reasonably well for a range of coordinates after the nozzle’s exi t [4].\n\nExtraction efficiencies and delay times of subsonic helium and a rgon flows inside a fission ion guide are being characterized at the IGISO L-4 facility at the University of Jyvaskyla using a radioactive 223Ra α-r ecoil source (T1/2=11.4 d). The status of these measurements will be discu ssed in the second part of this talk. This characterization defines lower limits of production yields and lifetimes of the nuclear reaction products to be studied using gas cells. \n\n[1] Yu. Kudryavtsev et al.\, Beams of short lived nuclei produced by selective laser ionization in a gas cell\, Nucl. Instrum. Meth. Phys. Res. B\, 114\, 350 (1996) \n\n[2] I. D. Moore\, P. Dendooven\, and J. Ärje\, The IGISOL technique—three decades of dev elopments. In: Äystö J.\, Eronen T.\, Jokinen A.\, Kankainen A.\, Moore I.D.\, Penttilä H.\, Three decades of research using IGISOL technique at the University of Jyväskylä. Springer\, Dordrecht (2013)\n\n[3] R. Ferre r et al.\, Towards high-resolution laser ionization spectroscopy of the he aviest elements in supersonic gas jet expansion\, Nat. Commun. 8\, 14520 ( 2017)\n\n[4] A. Zadvornaya et al.\, Characterization of Supersonic Gas Jet s for High Resolution Laser Ionization Spectroscopy of Heavy Elements\, Ph ys. Rev. X\, 8\, 041008 (2018)\n\nhttps://nyx.physics.mcgill.ca/event/149/ contributions/931/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/931/ END:VEVENT BEGIN:VEVENT SUMMARY:Recent experimental results of KEK Isotope Separation System (KISS ) DTSTART;VALUE=DATE-TIME:20190719T131000Z DTEND;VALUE=DATE-TIME:20190719T133000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-930@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Yutaka Watanabe (KEK WNSC)\nKEK Isotope Separation S ystem (KISS) is a laser ion source with an argon gas cell\, we have been d eveloping at RIKEN RIBF facility [1\,2]. The KISS project is motivated by the systematic nuclear spectroscopy of neutron-rich nuclei at the north-ea st part of the nuclear chart\, that is from around neutron-magic number 12 6 to the trans-uranium region. The systematic studies of lifetimes\, masse s\, beta-gamma spectroscopy and laser spectroscopy of those nuclei will pr ovide information of nuclear structures\, which is crucial inputs to the t heoretical predictions of nuclear parameters included in the the simulatio n of r-process nucleosynthesis\, its astrophysical environments remain unr evealed yet.\n\nKISS has an argon gas cell which is optimized to efficient ly collect and extract nuclear products in the multi nucleon transfer (MNT ) reactions\, which are considered to be appropriate mechanism to produce neutron-rich nuclei of interest [3\,4]. The employment of a doughnut-shape d gas cell with high-vacuum condition of the primary beam line improved th e extraction efficiency [5]. The laser resonance ionization technique is u sed to element-selectively ionize the element of interest. Those photo-ion s are transported by RF ion guides through the differential pumping area a nd are finally accelerated by a high voltage to select one species of isot opes with a mass separator. In-gas-cell and in-gas-jet laser ionizations a re utilized at KISS.\n\nIn this presentation\, we will report the present status\, the recent experimental results and the future plan of KISS.\n\n[ 1] Y. Hirayama et al.\, Nucl. Instrum. and Methods B 353 (2015) 4.\n[2] Y. Hirayama et al.\, Nucl. Instrum. and Methods B 376 (2016) 52.\n[3] Y.H. K im et al.\, EPJ Web of conferences 66 (2014) 03044.\n[4] Y.X. Watanabe et al.\, Phys. Rev. Lett. 115 (2015) 172503.\n[5] Y. Hirayama et al.\, Nucl. Instrum. and Methods B 412 (2017) 11.\n\nhttps://nyx.physics.mcgill.ca/eve nt/149/contributions/930/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/930/ END:VEVENT BEGIN:VEVENT SUMMARY:Development of a New Laser Ablation Ion Source DTSTART;VALUE=DATE-TIME:20190718T182000Z DTEND;VALUE=DATE-TIME:20190718T184000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-929@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Tim Ratajczyk (TU Darmstadt\, Institut für Kernphys ik\, Darmstadt\, Germany)\nA new laser ablation ion source is under develo pment at the Institute for Nuclear Physics\, TU Darmstadt for high-precisi on collinear laser spectroscopy. The design will combine the versatility o f laser ablation ion production and the non-conservative cooling in Helium buffer gas\, to produce a low emittance ion beam of a wide range of eleme nts. It is based on the original idea of an RF-only ion funnel [1] using o nly the gas jet to transport the ablated ions\, which are radially confine d by RF electrodes. Additionally\, this design will contain a new feature that will allow to further cool and bunch the ion beam. For this purpose\, an additional RF electrode stack is placed in the next pumping stage supe rimposed by a DC gradient towards the exit [2]. The last electrode can be connected to a positive voltage to create a potential barrier and stop the ions to produce a narrow ion bunch. Detailed computer simulations have sh own that this ion source [3] will allow us to produce various high-quality continuous and pulsed ion beams\, with low transverse and longitudinal em ittance. We will present the current status and first results of this proj ect development.\n\n[1] Victor Varentsov\, A new Approach to the Extractio n System Design\, SHIPTRAP\nCollaboration Meeting\, 19 March\, 2001\, DOI: https://doi.org10.13140/RG.2.2.30119.55200\n\n[2] Victor Varentsov\, Prop osal for a new Laser ablation ion source for LaSpec and MATS testing\, NUS TAR Collaboration Meeting\, 1 March\, 2016\, DOI: https://doi.org10.13140/ RG.2.2.10904.39686\n\n[3] T. Ratajczyk\, V. Varentsov and W. Nörtershäus er\, Status of a new laser ablation ion beam\nsource for LASPEC\, GSI-FAIR SCIENTIFIC REPORT 2017\, DOI: https://doi.org10.15120/GR-2018-1\n\nhttps: //nyx.physics.mcgill.ca/event/149/contributions/929/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/929/ END:VEVENT BEGIN:VEVENT SUMMARY:MIRACLS: A Multi Ion Reflection Apparatus for Collinear Laser Spe ctroscopy DTSTART;VALUE=DATE-TIME:20190717T140000Z DTEND;VALUE=DATE-TIME:20190717T143000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-928@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Simon Sels (CERN)\nLaser spectroscopy is a well-esta blished technique for studying nuclear ground-state properties in a model- independent way. By observing the isotope shifts and hyperfine structures of the atoms’ spectral lines\, the technique provides access to the char ge radii and electromagnetic moments of the nuclear ground- and isomeric s tates [1\, 2]. While in-source laser spectroscopy in a hot cavity is a ver y sensitive method that is able to measure rare isotopes with production r ates below one particle per second at ISOL facilities [3]\, the spectral r esolution of this method is limited by Doppler broadening to ~5 GHz. Colli near laser spectroscopy (CLS) on the other hand\, provides an excellent sp ectral resolution of ~10 MHz [1] which is of the order of the natural line widths of allowed optical dipole transitions. However\, CLS requires yiel ds of more than 100 or even 10\,000 ions/s depending on the specific case and spectroscopic transition [4].\n\nThe MIRACLS project at CERN aims to d evelop a laser spectroscopy technique that combines both the high spectral resolution of conventional fluorescence CLS with an enhanced sensitivity factor of 20-600 depending on the mass and lifetime of the studied nuclide . The sensitivity increase is derived from an extended observation time pr ovided by trapping ion bunches in a Multi-Reflection Time-of-Flight device where they can be probed several thousand times [5]. A proof-of-principle apparatus\, operating at 2 keV beam energy\, has been assembled at CERN I SOLDE with the goal of demonstrating the MIRACLS concept\, benchmark simul ations [6] that will be employed to design a future device operating at 30 keV and further technological developments.\n\nRecently\, first measureme nts have been performed with the proof-of-principle apparatus using stable magnesium isotopes as a first test case. Laser spectroscopy has been perf ormed on 24\,26Mg+ ions trapped for more than 5000 revolutions in the MR-T oF. Line widths close to the Doppler limit in this 2-keV machine have been achieved. Furthermore\, a.o. collinear-anticollinear spectroscopy has bee n performed on 40Ca+ ions. Extensive characterizing study of the device is ongoing.\nThis talk will introduce the MIRACLS concept\, present the firs t results and current status of the project as well as an outlook towards further developments.\n\n[1] K. Blaum\, et al.\, Phys. Scr. T152\, 014017 (2013)\n[2] P. Campbell et al.\, Prog. Part. and Nucl. Phys. 86\, 127-180 (2016)\n[3] B. Marsh et al.\, Nature Physics 14\, 1163-1167 (2018)\n[4] R. Neugart\, J. Phys. G: Nucl. Part. Phys. 44 (2017)\n[5] S. Sels et al.\, N ucl. Instr. Meth. B\, In press (2019) DOI: 10.1016/j.nimb.2019.04.076\n[6 ] F. Maier\, et al. Hyperfine Interact (2019) 240:54\n\nhttps://nyx.physic s.mcgill.ca/event/149/contributions/928/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/928/ END:VEVENT BEGIN:VEVENT SUMMARY:Particle-in-Cell Simulations for Studies of Space Charge Effects i n Ion Trap and Ion Transport Devices DTSTART;VALUE=DATE-TIME:20190718T140000Z DTEND;VALUE=DATE-TIME:20190718T143000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-927@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Ryan Ringle (NSCL/FRIB)\nOne of the least intuitive phenomena in ion trap or ion transport devices is the effect of large numb ers of charged particles\, also known as space charge\, on the performance of the device. Space charge can shield applied DC and RF fields\, leading to poor transport efficiencies and increased spatial and energy distribut ions. Robust simulation methods must be employed in order to mitigate thes e effects and to gain a better understanding of the device in the presence of space charge. However\, standard ion optics software\, such as SIMION [1]\, have limited ability to handle space charge\, or are not optimized t o efficiently study the system of interest. Therefore\, other\, more speci alized\, techniques must be used.\n\nThe particle-in-cell (PIC) method has been used to study plasmas and gravitational systems for decades\, typica lly employing 2D or 3D coordinate systems. Thorough treatments of the subj ect can be found in [2\, 3]. Modern desktop computing hardware make 3D PI C simulations with millions of super particles possible in a reasonable am ount of time without requiring a high-performance computing cluster. The 3DCylPIC package [4] was developed to study devices at FRIB/NSCL\, such as RF carpets\, gas cells\, radiofrequency quadrupole cooler/bunchers\, MR-T OFs\, etc.\, that need to operate effectively in the presence of large amo unts of space charge. In this talk I will describe how 3DCylPIC operates and present the results of simulations of devices that are currently in us e\, making comparisons to measurements where possible.\n\n[1] D. A. Dahl\ , Int. J. Mass Spectrom. 200 (2000) 3–25. \n[2] C. K. Birdsall\, A. B. Langdon\, Plasma physics via computer simulation\, McGraw-Hill\, New York\ , 1985. \n[3] R. W. Hockney\, J. W. Eastwood\, Computer simulation using particles\, A. Hilger\, Bristol [England] \; Philadelphia\, 1988. \n[4] R . Ringle\, Int. J. Mass Spectrom. 303 (2011) 42-50.\n\nhttps://nyx.physics .mcgill.ca/event/149/contributions/927/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/927/ END:VEVENT BEGIN:VEVENT SUMMARY:The Advanced Cryogenic Gas Stopper at NSCL – Progress towards Op erations DTSTART;VALUE=DATE-TIME:20190718T133000Z DTEND;VALUE=DATE-TIME:20190718T140000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-926@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Kasey Lund (The National Superconducting Cyclotron L aboratory )\nThe Advanced Cryogenic Gas Stopper (ACGS) has successfully de livered its first rare isotope beam for experiments at the National Superc onducting Cyclotron Laboratory (NSCL). The ACGS has shown an increase ext raction efficiency\, reduce transport time\, reduce molecular contaminatio n of the isotope of interest\, and the ability to minimize space charge ef fects. This is achieved by a novel 4-phase Radio Frequency wire-carpet whi ch generates a traveling electrical wave for fast and efficient ion transp ort\, cryogenic cooling of the helium gas chamber reduces unwanted molecul ar formation\, and the new planar geometry with the wire-carpet in the mid -plane of stopper alleviates space charge effects. Offline testing of ACGS has shown wire-carpet transport efficiencies greater than 95% and transpo rt speeds up to 100 m/s. Operating at a temperature of near 80 K\, ACGS de livered argon-44 to the ReA3 system reliably for over a week with a beam r ate up to twice as much as advertised on the ReA3 Beam List. This presenta tion will show the most recent online and offline performance of the ACGS and discuss advancements made regarding extraction from the gas stopper.\n \nhttps://nyx.physics.mcgill.ca/event/149/contributions/926/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/926/ END:VEVENT BEGIN:VEVENT SUMMARY:First application of mass selective re-trapping enables mass measu rements of neutron-deficient Yb and Tm isotopes despite strong isobaric ba ckground DTSTART;VALUE=DATE-TIME:20190717T131000Z DTEND;VALUE=DATE-TIME:20190717T133000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-924@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Moritz Pascal Reiter (JLU Giessen\, TRIUMF)\nTRIUMF ’s Ion Trap for Atomic and Nuclear science (TITAN) [1] located at the Is otope Separator and Accelerator (ISAC) facility\, TRIUMF\, Vancouver\, Can ada is a multiple ion trap system specialized in performing high-precision mass measurements and in-trap decay spectroscopy of short-lived radioacti ve ions. Although ISAC can deliver high yields for some of the most exotic species\, many measurements suffer from strong isobaric background. In or der to overcome this limitation an isobar separator based on the Multiple- Reflection Time-Of-Flight Mass Spectrometry (MR-TOF-MS) technique has been developed and installed at TITAN [2]. \nMass selection is achieved using dynamic re-trapping of the ions of interest after a time-of-flight analysi s in an electrostatic isochronous reflector system [3]. Re-using the injec tion trap of the device for the mass-selective re-trapping\, the TITAN MR- TOF-MS can operate as its very own high resolution isobar separator prior to mass measurements within the same device. This combination of operation modes boosts the dynamic range and background handling capabilities of th e device\, enabling high precision mass measurements with ion of interests to contaminant ratios of 1:10^6. \nWe will discuss the technical aspects of re-trapping and recent results of mass measurements of neutron-deficie nt Yb and Tm isotopes investigating the persistence of the N=82 neutron sh ell closure far from stability made possible by employing for the first ti me online mass selective re-trapping to supress strong isobaric background . \nReferences: \n[1] J. Dilling et al.\, NIM B 204\, 2003\, 492–496\n[2 ] C. Jesch et al.\, \, Hyperfine Interact. 235 (1-3)\, 2015\, 97–106\n[3 ] T. Dickel et al. J. Am. Soc. Mass Spectrom. (2017) 28: 1079\n\nhttps://n yx.physics.mcgill.ca/event/149/contributions/924/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/924/ END:VEVENT BEGIN:VEVENT SUMMARY:Status of the radiofrequency quadrupole cooler/buncher at TRIUMF-C ANREB DTSTART;VALUE=DATE-TIME:20190718T193000Z DTEND;VALUE=DATE-TIME:20190718T195000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-923@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Brad Schultz (TRIUMF)\nThe Canadian Rare-isotope fac ility with Electron Beam ion source (CANREB) is currently being commission ed at TRIUMF in Vancouver\, Canada. CANREB will accept rare isotope beams from the Isotope Separator and Accelerator (ISAC) or Advanced Rare Isotope Laboratory (ARIEL) facilities. The ions will be charge bred using an elec tron beam ion source (EBIS) to 3 ≤ m/q ≤ 7 for post-acceleration to me dium- and high-energy experiments. For injection into the EBIS\, continuou s ion beams from the source will be cooled and bunched using a radiofreque ncy quadrupole (RFQ) cooler/buncher. Results from initial RFQ commissionin g tests\, as well as an overall status of CANREB\, will be presented.\n\nh ttps://nyx.physics.mcgill.ca/event/149/contributions/923/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/923/ END:VEVENT BEGIN:VEVENT SUMMARY:Laser Resonance Chromatography (LRC): A new methodology in superhe avy element research DTSTART;VALUE=DATE-TIME:20190716T180000Z DTEND;VALUE=DATE-TIME:20190716T182000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-922@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Mustapha Laatiaoui (JGU Mainz)\nOptical spectroscopy constitutes the historical path to accumulate basic knowledge on the atom and its structure. Former work based on fluorescence and resonance ioniza tion spectroscopy enabled identifying optical spectral lines up to element 102\, nobelium [1\, 2]. Beyond nobelium\, solely predictions of the atom ’s structure exist\, which in general are far from sufficient to reliabl y identify atoms from spectral lines. One of the major difficulties in ato mic model calculations arise from the complicated interaction between the numerous electrons in atomic shells\, which necessitate conducting experim ents on such exotic quantum systems. The experiments\, however\, face the challenging refractory nature of the elements\, which lay ahead\, coupled with shorter half-lives and decreasing production yields.\nIn this contrib ution\, a new concept of laser spectroscopy of the superheavy elements is proposed. To overcome the need for detecting fluorescence light or for neu tralization of the fusion products\, which were employed up to date when l acking tabulated spectral lines\, the new concept foresees resonant optica l excitations to alter the ratio of ions in excited metastable states to i ons in the ground state. The excitation process shall be readily measurabl e using electronic-state chromatography techniques [3\, 4] as the ions exh ibit distinct ion mobilities at proper conditions and thus drift at differ ent speeds through the apparatus to the detector. The concept offers unpar alleled access to laser spectroscopy of many mono-atomic ions across the p eriodic table of elements\, in particular\, the transition metals includin g the high-temperature refractory metals and the elusive superheavy elemen ts like rutherfordium and dubnium at the extremes of nuclear existence.\n\ nThis project has received funding from the European Research Council (ERC ) under the European Union’s Horizon 2020 research and innovation progra mme (No. 819957)\n\n**References**\n1. J. Reader A. Kramida\, Yu. Ralchenk o and NIST ASD Team (2018)\, 2019.\n2. M. Laatiaoui et al.\, Nature\, 538 (2016) 495.\n3. P. R. Kemper and M. T. Bowers\, J. Phys. Chem.\, 95 (1991) 5134.\n4. M. J. Manard and P. R. Kemper\, Int. J. Mass Spectrom.\, 407 (2 016) 69.\n\nhttps://nyx.physics.mcgill.ca/event/149/contributions/922/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/922/ END:VEVENT BEGIN:VEVENT SUMMARY:Improvement of a dc-to-pulse conversion efficiency of FRAC DTSTART;VALUE=DATE-TIME:20190718T184000Z DTEND;VALUE=DATE-TIME:20190718T190000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-921@nyx.physics.mcgill.ca DESCRIPTION:Speakers: So Sato (Department of Physics\, Rikkyo University\, Toshima\, Tokyo 171-8501\, Japan)\nAt the SCRIT electron scattering facil ity at RIKEN [1\,2]\, we aim at realizing the world's first electron scatt ering experiment of unstable nuclei\, after succeeding in principle verifi cation experiment using stable nuclei $^{132}$Xe [3].\nIn order to perform electron scattering with unstable nuclei with small production rate\, it is important to accumulate and inject ions efficiently into the SCRIT devi ce. For this purpose\, it is necessary to convert a continuous ion beam from the ISOL type ion separator ERIS [4] to a pulsed beam with the pulse duration of 300~500 μs.\nWe developed a dc-to-pulse converter\, called FR AC [5]\, based on RFQ linear ion trap and have attained the dc-to-pulse co nversion efficiency of 5.6%. \nWe modified the FRAC to further improve the efficiency\, and enabled cooling of the trapped ions by Xe gas of ~10$^{- 3}$ Pa. Then an electric field gradient was applied in the longitudinal di rection of FRAC.\nAs a result\, the conversion efficiency was improved by more than 10 times compared to that before modification. Details of the mo dification and its latest performance will be presented.\n\n**References:* *\n[1] M. Wakasugi et al.\, Nucl. Instrum. Meth. **B317**\, 668 (2013).\n[ 2] T. Ohnishi et al.\, Physca Scripta **T166**\, 014071 (2015).\n[3] K. Ts ukada et al.\, Phys. Rev. Lett. **118**\, 262501 (2017).\n[4] T. Ohnishi e t al.\, Nucl. Instrum. Meth. **B317**\, 357 (2013).\n[5] M. Wakasugi et al .\, Rev. Sci. Instrum. **89**\, 095107 (2018).\n\nhttps://nyx.physics.mcgi ll.ca/event/149/contributions/921/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/921/ END:VEVENT BEGIN:VEVENT SUMMARY:Reviewing the success of radioactive-ion manipulation with RFQ tra ps and recalling the contributions from McGill DTSTART;VALUE=DATE-TIME:20190716T131000Z DTEND;VALUE=DATE-TIME:20190716T133000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-920@nyx.physics.mcgill.ca DESCRIPTION:Speakers: David Lunney (CSNSM/IN2P3 Orsay)\nIon cooling and tr apping techniques have opened new vistas in the physics associated with ex otic (short-lived) nuclides and helped cure the ills of isobaric contamina tion. The ability of condensing ion-beam phase space using soothing cold b uffer gas accompanied by electromagnetic confinement has created a new par adigm: beam preparation. The main player in this field is the so-called R FQ cooler-buncher\, a segmented linear Paul trap that can capture exotic n uclides hot off the target\, reducing emittance by grouping ions into a ti ght bunch. \n\nInspired by a 1982 sabbatical leave in Mainz with the grou p of H.-J. Kluge developing Penning traps for ISOLDE\, the late R.B. Moore initiated the first ion-catching developments at McGill with many of deta ils elaborated (at the bar) in Thomson House\, the SMI2019 conference venu e. \n\nBunchers are now used for mass measurements and collinear laser spe ctroscopy of exotic nuclides. Further evolutions have them preceeding dip ole mass separators to increase resolving power and even inside ISOL targe t modules combined with laser ionization for beam purification. RFQ bunch ers are also necessary preparatory devices for the fabulous multi-reflecti on time of flight (MRToF) mass spectrometers that are now pervading the ra dioactive-ion scene.\n\nIn this presentation\, the (local) history will be briefly told and the rich evolution of cooler-bunchers will be illustrate d as exhaustively as time will permit.\n\nhttps://nyx.physics.mcgill.ca/ev ent/149/contributions/920/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/920/ END:VEVENT BEGIN:VEVENT SUMMARY:The N=126 factory at Argonne National Laboratory DTSTART;VALUE=DATE-TIME:20190719T140000Z DTEND;VALUE=DATE-TIME:20190719T143000Z DTSTAMP;VALUE=DATE-TIME:20260305T141753Z UID:indico-contribution-149-919@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Adrian A. Valverde (Argonne National Laboratory)\nTh e properties of nuclei near the neutron $N=126$ shell are critical to the understanding of the production of elements via the astrophysical $r$-proc ess pathway\, particularly for the $A\\sim195$ abundance peak [1]. Unfortu nately traditional particle-fragmentation\, target-fragmentation\, or fiss ion production techniques do not efficiently produce these nuclei. Multi-n ucleon transfer (MNT) reactions between two heavy ions\, however\, can eff iciently produce these nuclei [2]. The $N=126$ factory currently under con struction at Argonne National Laboratory's ATLAS facility will make use of these reactions to allow for the study of these nuclei [3]. Because of th e difficulty collecting MNT reaction products\, this new facility will use a large-volume gas catcher\, similar to the one currently in use at CARIB U\, to convert these reaction products into a low energy beam that will in itially be mass separated with a magnetic dipole of resolving power $R\\si m10^3$. Subsequently\, the beam will pass through an RFQ cooler-buncher an d MR-TOF system to provide high mass resolving power ($R\\sim10^5$) suffic ient to suppress isobaric contaminants. The isotopically separated\, bunch ed low-energy beams will then be available downstream for measurements suc h as mass measurements using the CPT mass spectrometer or decay studies. T he status of the facility under construction will be presented\, together with commissioning results of the component devices. This work was support ed in part by the U.S. Department of Energy\, Office of Nuclear Physics\, under Contract No. DE-AC02-06CH11357\; by NSERC (Canada)\, Application No. SAPPJ-2018-00028\; by the National Science Foundation under Grant No. PHY -1713857\; by the University of Notre Dame\; and used resources of ANL’s ATLAS facility\, an Office of Science User Facility.\n\n[1] M. Arnould\, S. Goriely\, and K. Takahashi\, Phys. Rep. **450**\, 97 (2007) \n[2] V. Za grebaev and W. Greiner\, Phys. Rev. Lett. **101**\, 122701 (2008)\n[3] G. Savard\, M. Brodeur\, J.A. Clark and A.A. Valverde\, Nucl. Instr.\nMeth. P hys. Res. B Proceedings of EMIS-2018 (in press)\n\nhttps://nyx.physics.mcg ill.ca/event/149/contributions/919/ LOCATION:McGill University Ball Room URL:https://nyx.physics.mcgill.ca/event/149/contributions/919/ END:VEVENT END:VCALENDAR