Mainz 2012 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 53: Poster – Instrumentation
HK 53.7: Poster
Thursday, March 22, 2012, 14:00–16:00, P Foyer
Investigation of the Position-Resolved Timing Performance of a Time-of-Flight Detector for IMS at the FRS-ESR — •Wayne Lippert1, Marcel Diwisch1, Hans Geissel1,2, Ronja Knöbel1,2, Natalia Kuzminchuk1,2, Wolfgang Plaß1,2, and Christoph Scheidenberger1,2 — 1Justus-Liebig-Universität Gießen — 2GSI, Darmstadt
High-precision mass measurements of exotic nuclei can be performed using Isochronous Mass Spectrometry at the FRS-ESR facility at GSI. The mass values are obtained from the revolution time measurement by a time-of-flight detector placed in the storage ring. In the detector the ions pass a thin carbon foil and release secondary electrons, which are then transported to micro channel plates by magnetic and electric fields. The timing performance of the detector is of high importance because it directly influences the mass measurement accuracy.
The timing accuracy of the detector has been investigated. An aperture assembly enabling measurement of the spatially resolved accuracy was constructed and mounted inside the detector. The setup consists of a Si detector and a movable aperture. Only those ions that pass through the aperture and impinge on the Si detector are considered for the time determination. First measurements are in good agreement with previous studies and allow one to understand the spatial contribution to the timing resolution. The design of the assembly as well as the first measurement results will be presented.