Konferenzpaper

Jahr der Veröffentlichung: 2013

Seiten: 457-462

Zeitschrift: Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms

Bandnummer: 317

ISSN: 0168-583X

eISSN: 1872-9584

DOI Link: https://doi.org/10.1016/j.nimb.2013.07.063

Konferenz: 16th International Conference on ElectroMagnetic Isotope Separators and Techniques Related to their Applications (EMIS)

Verlag: Elsevier

Abstract: 
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 Rn-219 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 U-238 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 Rn-213 with a half-life of 19.5 ms only. (C) 2013 Elsevier B.V. All rights reserved.

Harvard-Zitierstil: Plass, W., Dickel, T., Purushothaman, S., Dendooven, P., Geissel, H., Ebert, J., et al. (2013) The FRS Ion Catcher - A facility for high-precision experiments with stopped projectile and fission fragments, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 317, pp. 457-462. https://doi.org/10.1016/j.nimb.2013.07.063

APA-Zitierstil: Plass, W., Dickel, T., Purushothaman, S., Dendooven, P., Geissel, H., Ebert, J., Haettner, E., Jesch, C., Ranjan, M., Reiter, M., Weick, H., Amjad, F., Ayet, S., Diwisch, M., Estrade, A., Farinon, F., Greiner, F., Kalantar-Nayestanaki, N., Knoebel, R., ...Yavor, M. (2013). The FRS Ion Catcher - A facility for high-precision experiments with stopped projectile and fission fragments. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 317, 457-462. https://doi.org/10.1016/j.nimb.2013.07.063