Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 39: Instrumentation and Applications V

HK 39.4: Talk

Thursday, March 11, 2004, 14:45–15:00, C

First Experience with the Lambda Wheel — •Michiel Demey, Andreas Reischl, and Jos Steijger — NIKHEF PO Box 41882, 1009 DB Amsterdam, The Netherlands

The Lambda Wheel is a tracking detector built from silicon strip sensors. It is installed in the vacuum of the target chamber in the HERMES experiment at DESY and located at a distance of 25 cm from the end of the target cel. The detector consists out of two disks which cover a radial area between 4.5 and 16 cm from the beam. Both disks are made of double sided silicon with a thickness of 300 µm and a strip pitch of 160 µm. In total there are 24000 strips to be readout.

Since the startup of the HERA accelerator in September 2003 this detector is part of the HERMES spectrometer. First studies on alignment and efficiencies will be presented together with preliminary results on track reconstruction.