Berlin 2014 – wissenschaftliches Programm
MS 3.3: Vortrag
Montag, 17. März 2014, 17:15–17:30, DO24 1.205
Status Report of the FRS Ion Catcher — •Timo Dickel1,2 and the FRS Ion Catcher Collaboration1 — 1GSI Darmstadt — 2Justus-Liebig-Universität
The FRS Ion Catcher facility is a prototype for the LEB of the Super-FRS. It is used to thermalize relativistic exotic nuclides in a cryogenic helium-filled stopping cell (CSC) and provides, with the help of a multi-reflection time-of-flight mass spectrometer (MR-TOF-MS), an isobarically clean beam to experiments further downstream. The MR-TOF-MS can also be used for mass measurements of short-lived nuclei with half-lives down to 10ms. The MR-TOF-MS is also an indispensable diagnostic device for operation of the stopping cell.
The CSC and MR-TOF-MS are central elements of the LEB and were successfully commissioned on-line in recent beamtimes at the FRS Ion Catcher at GSI. For the first time, a stopping cell for exotic nuclei was operated on-line at cryogenic temperatures. Various projectile fragments were thermalized and extracted with high efficiencies and short extraction times. Moreover, direct mass measurements of short-lived nuclei were performed with an MR-TOF-MS, among them the nuclide 213Rn with a half-life of only 19.5 ms. Current status and upgrades of the facility will be presented.