Gießen 2007 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 47: Instrumentation und Anwendungen
HK 47.6: Talk
Thursday, March 15, 2007, 15:30–15:45, F
Characterization and optimization of a time-of-flight detector for Isochronous Mass Spectrometry at FRS-ESR — •Benjamin Fabian1, Fritz Bosch2, Timo Dickel1, Hans Geissel2, Christophor Kozhuharov2, Ronja Knoebel2, Litvinov Sergey2, Baohua Sun2, Yuri Litvinov2, Martin Petrick1, Wolfgang Plass1, Christoph Scheidenberger2, Martin Winkler2, and Helmut Weick2 — 1II. Physikalisches Institut, Gie{\ss}en, Germany — 2GSI, Darmstadt, Germany
Isochronous Mass Spectrometry can be used to measure masses of exotic nuclei with lifetimes as short as a tens of microseconds at the FRS-ESR facility at GSI. For measurement of the ions* revolution frequencies, a time-of-flight detector is used. Secondary electrons released from a thin carbon foil at every passage of the ion through the detector are transported to micro-channel-plates (MCP) by electric and magnetic fields. The detector has been characterized and optimized. The transport of the secondary electrons onto the MCPs has been simulated and compared with offline measurements. Optimized settings have been found which increase the transmission efficiency by 100\%. The effect of different foil thicknesses and coatings on the detection efficiency have been investigated. Calculations of the secondary electron yield for different projectiles and energies have been performed.