Heidelberg 2007 – scientific programme

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T: Fachverband Teilchenphysik

T 213: Spurkammern I

T 213.2: Talk

Tuesday, March 6, 2007, 17:00–17:15, INF 327 SR 3

A Triple-GEM Detector with Pixel Readout for High-Rate Beam Tracking — •Florian Haas, Bernhard Ketzer, Igor Konorov, Alexander Mann, Thiemo Nagel, and Stephan Paul — Physik Department, Technische Universität München, D-85748 Garching, Deutschland

For its physics program with a high-intensity hadron beam of 2· 10⁷ particles/s, the COMPASS experiment at CERN requires tracking of charged particles scattered by very small angles with respect to the incident beam. While good resolution in time and space is mandatory, the challenge is imposed by the high beam intensity, requiring radiation hard detectors with small material budget in order to minimize secondary interactions.

To this end, a set of triple-GEM detectors with pixel readout in the beam region and 2-D strip readout in the periphery is being built. The pixel size has been chosen to be 1×1 mm². Peripheral to the pixel area, a 2-D strip readout with a pitch of 400 µm has been realized on the same printed circuit. In total an active area of 10×10 cm² is covered using 2048 readout channels. An analogue readout via the APV25-S1 ASIC has been chosen to profit from amplitude measurements on neighboring strips or pixels during clustering. A detector prototype has been tested successfully in the 5 · 10⁷ µ/s COMPASS muon beam, as well as in a focused hadron beam. The design of the detector and first results concerning its performance as a beam tracker will be presented. - Supported by : Maier-Leibnitz-Labor der TU und LMU München