Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 31: Instrumentation and Applications IV

HK 31.6: Talk

Wednesday, March 10, 2004, 15:30–15:45, C

Cold Silicon Detectors in Compass [†] — •Matthias Becker, Anna-Maria Fuchs, Rita de Masi, Jan Friedrich, Igor Konorov, Stephan Paul, and Michael Wiesmann — TU Muenchen, Physik-Department E18, 85748 Garching

The Compass experiment at Cern, Sps carries out investigations of the structure and spectroscopy on the nucleon with both muon and hadron beams of high intensity.

For track reconstruction with high spatial resolution in the target region, silicon microstrip detectors are used directly in the beam.

The damage caused by the hadron beam is so high that the detectors show a noticeable breakdown of their performance already after one year. Therefore they are operated at 130 K in order to exploit the so-called Lazarus effect. Thus their lifetime is extended by a factor of 5.

We report on the construction and commissioning of the liquid nitrogen cooled silicon detectors and show first results of performance tests in the 2003 beamtime. Plans for 2004 are presented to operate six detectors with an automatic cooling system.

[†] This work is supported by the BMBF and the Maier-Leibnitz-Labor of the Universities of Munich