TY - JOUR
T1 - The FRS Ion Catcher – A facility for high-precision experiments with stopped projectile and fission fragments
AU - Plab, W R
AU - Dickel, T
AU - Purushothaman, Sivaji
AU - Dendooven, P
AU - Geissel, H.
AU - Ebert, J
AU - Haettner, E
AU - Jesch, C.
AU - Ranjan, M
AU - Reiter, M. P.
AU - Weick, H
AU - Amjad, F
AU - Ayet, S.
AU - Diwisch, M.
AU - Estrade, A
AU - Farinon, F.
AU - Greiner, F
AU - Kalantar-Nayestanaki, N.
AU - Knöbel, R.
AU - Kurcewicz, J.
AU - Lang, J
AU - Moore, I
AU - Mukha, I.
AU - Nociforo, C.
AU - Petrick, M
AU - Pfützner, M.
AU - Pietri, S.
AU - Prochazka, A.
AU - Rink, A K
AU - Rinta-Antila, S
AU - Schafer, D
AU - Sheidenberger, C
AU - Takechi, M.
AU - Tanaka, Y K
AU - Winfield, J.S.
AU - Yavor, M. I.
PY - 2013/12/15
Y1 - 2013/12/15
N2 - At the FRS Ion Catcher at GSI, projectile and fission fragments are produced at relativistic energies, separated in-flight, range-focused, slowed down and thermalized in a cryogenic stopping cell. A multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) is used to perform direct mass measurements and to provide an isobarically clean beam for further experiments, such as mass-selected decay spectroscopy. A versatile RF quadrupole transport and diagnostics unit guides the ions from the stopping cell to the MR-TOF-MS, provides differential pumping, ion identification and includes reference ion sources. The FRS Ion Catcher serves as a test facility for the Low-Energy Branch of the Super-FRS at the Facility for Antiproton and Ion Research (FAIR), where the cryogenic stopping cell and the MR-TOF-MS will be key devices for the research with stopped projectile and fission fragments that will be performed with the experiments MATS and LaSpec. Off-line tests of the stopping cell yield a combined ion survival and extraction efficiency for 219Rn ions of about 30% and an extraction time of about 25 ms. The stopping cell and the MR-TOF-MS were commissioned on-line as part of the FRS Ion Catcher. For the first time, a stopping cell for exotic nuclei was operated on-line at cryogenic temperatures. Using a gas density almost two times higher than ever reached before for a stopping cell with RF ion repelling structures, various 238U projectile fragments were thermalized and extracted with very high efficiency. Direct mass measurements of projectile fragments were performed with the MR-TOF-MS, among them the nuclide 213Rn with a half-life of 19.5 ms only.
AB - At the FRS Ion Catcher at GSI, projectile and fission fragments are produced at relativistic energies, separated in-flight, range-focused, slowed down and thermalized in a cryogenic stopping cell. A multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) is used to perform direct mass measurements and to provide an isobarically clean beam for further experiments, such as mass-selected decay spectroscopy. A versatile RF quadrupole transport and diagnostics unit guides the ions from the stopping cell to the MR-TOF-MS, provides differential pumping, ion identification and includes reference ion sources. The FRS Ion Catcher serves as a test facility for the Low-Energy Branch of the Super-FRS at the Facility for Antiproton and Ion Research (FAIR), where the cryogenic stopping cell and the MR-TOF-MS will be key devices for the research with stopped projectile and fission fragments that will be performed with the experiments MATS and LaSpec. Off-line tests of the stopping cell yield a combined ion survival and extraction efficiency for 219Rn ions of about 30% and an extraction time of about 25 ms. The stopping cell and the MR-TOF-MS were commissioned on-line as part of the FRS Ion Catcher. For the first time, a stopping cell for exotic nuclei was operated on-line at cryogenic temperatures. Using a gas density almost two times higher than ever reached before for a stopping cell with RF ion repelling structures, various 238U projectile fragments were thermalized and extracted with very high efficiency. Direct mass measurements of projectile fragments were performed with the MR-TOF-MS, among them the nuclide 213Rn with a half-life of 19.5 ms only.
U2 - 10.1016/j.nimb.2013.07.063
DO - 10.1016/j.nimb.2013.07.063
M3 - Article
SN - 0168-583X
VL - 317
SP - 457
EP - 462
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
IS - Part B
ER -