Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session 2WEA: Gas Cells for Rare Isotope Beam Research IInvited Workshop
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Chair: Ryan Ringle Room: Hilton Waikoloa Village Queens 4 |
Sunday, November 26, 2023 2:00PM - 2:30PM |
2WEA.00001: Gas Cell in RIB Research - A future/historical perspective Invited Speaker: Guy Savard Gas cell technology has revolutionized the RIB production field by providing capabilities that merge the universality of the in-flight production approaches with the beam quality of the ISOL techniques, combining the best of both worlds. This talk will present the basic principles behind this approach and follow the evolution of these devices from the early small scale devices to current state-of-the-art instruments. The many challenges that had to be overcome will be presented, together with the curent capabilities, remaining challenges, and the proposed way forward. |
Sunday, November 26, 2023 2:30PM - 3:00PM |
2WEA.00002: Charge-state manipulations and systematics of low-energy RI beams extracted from a low-pressure gas cell at JAEA-ISOL Invited Speaker: Yuta Ito Precision experiments with short-lived radioactive isotopes (RI) using ion trap techniques are being prepared at the the Isotope Separator On-Line (ISOL) facility at the Japan Atomic Energy Agency (JAEA). This offers the potential to expand new research areas in nuclear physics and chemistry, including mass measurements of neutron-rich transactinide nuclei and in-trap gas-phase ion chemistry of superheavy elements. To conduct such experiments, efficient and rapid production of low-energy RI beams with energies in the electron-volt range is required. |
Sunday, November 26, 2023 3:00PM - 3:30PM |
2WEA.00003: Stopped Beam Delivery at FRIB Invited Speaker: Chandana Sumithrarachchi Stopping devices provide access to a wide range of exotic radioactive ion beams with precise and low-energies at projectile fragmentation facilities. The stopping process includes slowing down the fast exotic beams in solid degraders combined with momentum compression and removal of the remaining kinetic energy by collision with helium buffer gas. The beam stopping facility at the Facility for Rare Isotopes Beams (FRIB) includes two operational gas cells, namely the Room Temperature Gas Cell (RTGC)(1) constructed by Argonne National Lab and the Advanced Cryogenic Gas Stopper (ACGS)(2), connected two momentum compression high beam lines and low energy transport systems. The ACGS is designed and built to increase extraction efficiency, reduce drift time, reduce molecular contamination, and minimize space charge effect with relative to RTGC. Some of ACGS design properties has been tested with several beams and showed significant improvements. The stopped beam facility provides exotic radioactive beams to low energy experimental stations and reaccelerated experiments. The various user demands lead continuous improvements on the stopping and extraction efficiencies, the drift time in gas cell and the chemical forms of the extracted beams. The molecular forms of extracted ions have been studied for a variety of chemical elements at the room and cryogenic temperatures. The recent developments in the stopped beam facility, results of 29Mg, 22Al and 26P stopped beams and new challenges with the Advance Rare Isotope Separator (ARIS) beams will be presented. |
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