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HK: Fachverband Physik der Hadronen und Kerne

HK 47: Instrumentation und Anwendungen

HK 47.6: Vortrag

Donnerstag, 15. März 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.