TY - JOUR
T1 - Increasing the rate capability for the cryogenic stopping cell of the FRS Ion Catcher
AU - Super-FRS Experiment Collaboration
AU - Zhao, J. W.
AU - Amanbayev, D.
AU - Dickel, T.
AU - Miskun, I.
AU - Plaß, W. R.
AU - Tortorelli, N.
AU - San Andrés, S. Ayet
AU - Beck, S.
AU - Bergmann, J.
AU - Brencic, Z.
AU - Constantin, P.
AU - Geissel, H.
AU - Greiner, F.
AU - Gröf, L.
AU - Hornung, C.
AU - Kuzminchuk, N.
AU - Kripkó-Koncz, G.
AU - Mardor, I.
AU - Pohjalainen, I.
AU - Scheidenberger, C.
AU - Thirolf, P. G.
AU - Bagchi, S.
AU - Haettner, E.
AU - Kazantseva, E.
AU - Kostyleva, D.
AU - Oberstedt, A.
AU - Pietri, S.
AU - Reiter, M. P.
AU - Tanaka, Y. K.
AU - Wada, M.
AU - Balabanski, D. L.
AU - Benyamin, D.
AU - Harakeh, M. N.
AU - Hubbard, N.
AU - Kalantar-Nayestanaki, N.
AU - Mollaebrahimi, A.
AU - Mukha, I.
AU - Narang, M.
AU - Niwase, T.
AU - Patyk, Z.
AU - Purushothaman, S.
AU - Rotaru, A.
AU - Spǎtaru, A.
AU - Stanic, G.
AU - Vencelj, M.
AU - Weick, H.
AU - Yu, J.
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2024/2
Y1 - 2024/2
N2 - At the FRS Ion Catcher (FRS-IC), projectile and fission fragments are produced at relativistic energies, separated in-flight, energy-bunched, slowed down, and thermalized in the ultra-pure helium gas-filled cryogenic stopping cell (CSC). Thermalized nuclei are extracted from the CSC using a combination of DC and RF electric fields and gas flow. This CSC also serves as the prototype for the CSC of the Super-FRS, where exotic nuclei will be produced at unprecedented rates making it possible to go towards the extremes of the nuclear chart. Therefore, it is essential to efficiently extract thermalized exotic nuclei from the CSC under high beam rate conditions, in order to use the rare exotic nuclei, which come as cocktail beams. The dependence of the extraction efficiency on the intensity of the impinging beam into the CSC was studied with a primary beam of 238U and its fragments. Tests were done with two different versions of the DC electrode structure inside the cryogenic chamber, the standard 1 m long and a short 0.5 m long DC electrode systems. In contrast to the rate capability of 104 ions/s with the long DC electrode system, results show no extraction efficiency loss up to the rate of 2 × 105 ions/s with the new short DC electrode. This order of magnitude increase of the rate capability paves the way for new experiments at the FRS-IC, including studies of exotic nuclei with in-cell multi-nucleon transfer reactions. The results further validate the design concept of the CSC of the Super-FRS, which was developed to effectively manage beams of even higher intensities.
AB - At the FRS Ion Catcher (FRS-IC), projectile and fission fragments are produced at relativistic energies, separated in-flight, energy-bunched, slowed down, and thermalized in the ultra-pure helium gas-filled cryogenic stopping cell (CSC). Thermalized nuclei are extracted from the CSC using a combination of DC and RF electric fields and gas flow. This CSC also serves as the prototype for the CSC of the Super-FRS, where exotic nuclei will be produced at unprecedented rates making it possible to go towards the extremes of the nuclear chart. Therefore, it is essential to efficiently extract thermalized exotic nuclei from the CSC under high beam rate conditions, in order to use the rare exotic nuclei, which come as cocktail beams. The dependence of the extraction efficiency on the intensity of the impinging beam into the CSC was studied with a primary beam of 238U and its fragments. Tests were done with two different versions of the DC electrode structure inside the cryogenic chamber, the standard 1 m long and a short 0.5 m long DC electrode systems. In contrast to the rate capability of 104 ions/s with the long DC electrode system, results show no extraction efficiency loss up to the rate of 2 × 105 ions/s with the new short DC electrode. This order of magnitude increase of the rate capability paves the way for new experiments at the FRS-IC, including studies of exotic nuclei with in-cell multi-nucleon transfer reactions. The results further validate the design concept of the CSC of the Super-FRS, which was developed to effectively manage beams of even higher intensities.
KW - Cryogenic stopping cell
KW - Exotic nuclei
KW - Extraction efficiency
KW - Gas cell
KW - Rate capability
UR - http://www.scopus.com/inward/record.url?scp=85178150639&partnerID=8YFLogxK
U2 - 10.1016/j.nimb.2023.165175
DO - 10.1016/j.nimb.2023.165175
M3 - Article
AN - SCOPUS:85178150639
SN - 0168-583X
VL - 547
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
M1 - 165175
ER -