Bochum 2009 – scientific programme
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HK: Fachverband Hadronen und Kerne
HK 10: Accelerators and Instrumentation II
HK 10.7: Talk
Monday, March 16, 2009, 15:45–16:00, H-ZO 90
A Multiple-Reflection Time-of-Flight Isobar Separator and Mass Spectrometer (MR-TOF-MS) for the LEB at FAIR — •Timo Dickel1, Wolfgang R. Plaß1,2, Arno Becker1, Ulrich Czok1, Hans Geissel1,2, Christian Jesch1, Martin Petrick1, Christoph Scheidenberger1,2, André Simon1, and Mikhail I. Yavor3 — 1Justus-Liebig-Universität Gießen — 2GSI, Darmstadt — 3Inst. for Analytical Instrum., Russian Academy of Sci., St. Petersburg
At the LEB of the Super-FRS at FAIR, precision measurements of very short-lived nuclei will be performed. For these experiments (MATS, LASPEC), the nuclei have to be stopped, cooled, separated and measured fast and efficiently. To achieve this goal, a multi-purpose, non-scanning mass spectrometer with single-ion sensitivity, a multiple-reflection time-of-flight mass spectrometer, has been developed.
It will be positioned behind the gas-filled stopping cell at the LEB, where it can be used as a broadband mass spectrometer, an isobar separator or a high-precision mass spectrometer. The broadband mode will be used for optimization of the range and range-compression in the Super-FRS and the stopping and extraction from the gas cell. Isobaric contamination that is produced by secondary reactions in the degraders or by charge-exchange reactions in the gas cell can be orders of magnitude larger than the ions of interest. To remove these ions, the isobar separator mode is required, in which up to 107 isobaric ions/s can be handled. The high-precision mode enables measurements with an accuracy of 10−6 to 10−7 in about 2 ms. In this contribution the basic characteristics and performance of the device will be presented.