Münster 2011 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 13: Instrumentierung II
HK 13.7: Talk
Monday, March 21, 2011, 18:15–18:30, HS1
Operation of a thin scintillating fiber beam monitor at the COMPASS experiment 2010 — •Christopher Braun1, Jens Bisplinghoff2, Wolfgang Eyrich1, Christoph Adolph1, and Rainer Joosten2 — 1Physikalisches Institut IV der Universität Erlangen-Nürnberg — 2Helmholtz Institut für Strahlen- und Kernphysik Universität Bonn
In 2010, a beam luminosity monitor built of scintillating fibers was used for the first time at the COMPASS experiment. The capability to efficiently monitor the high luminosity SPS muon beam with additional spatial information was one of the main incentives for this innovation. The detector consists of two planes with two layers of 64 scintillating fibers of 1mm diameter each. It is located 3m upstream of the polarized target and covers an active area of 4.2×4.2cm2. Compared to the scintillating fiber detectors routinely used in COMPASS, the thickness is reduced by more than a factor of two to 2.5mm for each plane. The losses of scintillation light are compensated by a close-by readout, omitting light guides between the active area and the photomultipliers. Furthermore, new high quantum efficiency photomultipliers (16 channel multi-anode PMTs, Hamamatsu H6568-100) are used in one of the layers to study the differences in the performance with respect to the conventional ones. A comparison to data from 2007 will be presented as well as a detailed study of the performance with respect to other scintillating fiber detectors used in the COMPASS experiment.
supported by German BMBF