Bochum 2009 – wissenschaftliches Programm
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HK: Fachverband Hadronen und Kerne
HK 10: Accelerators and Instrumentation II
HK 10.6: Vortrag
Montag, 16. März 2009, 15:30–15:45, H-ZO 90
Development of a Time-of-Flight Detector System for Isochronous Mass Spectrometry at FAIR — •Natalia Kuzminchuk1,2, Hans Geissel1,2, Ronja Knöbel1,2, Christophor Kozhuharov2, Serguei Litvinov2, Yuri Litvinov2, Wolfgang Plaß1,2, Christoph Scheidenberger1,2, Baohua Sun2, and Helmut Weick2 — 1Justus-Liebig Universität Gießen, Germany — 2GSI, Darmstadt, Germany
At the FAIR facility, the projectile fragment separator Super-FRS will provide beams of exotic nuclei with unprecedented intensity. The new Collector Ring (CR) is optimized to accept the large-emittance secondary beams provided by the Super-FRS. High-precision mass measurements of exotic nuclei with life times as short as a few tens of microseconds will be performed with Isochronous Mass Spectrometry (IMS) at the CR.
For these measurements a dual detector system is under development. In the detectors, ions passing a thin carbon foil release secondary electrons, which are transported to microchannel plates by electric and magnetic fields. The time dispersion in the electron flight due to the velocity spread of the secondary emission electrons and the initial spatial distribution on the foil was investigated. The influence of the MCP dead time on the rate capability of the detectors was examined. An initial design of a new detector will be presented, which incorporates corresponding improvements in timing performance, rate capability and includes position-sensitive detection for beam tracking.