Mainz 2004 – wissenschaftliches Programm

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T: Teilchenphysik

T 401: Halbleiterdetektoren V

T 401.1: Gruppenbericht

Mittwoch, 31. März 2004, 14:00–14:25, RW 3

A Silicon Recoil detector for the HERMES experiment — •Arne Vandenbroucke — Department of Subatomic and Radiation Physics, University of Gent, B-9000 Gent

In the HERMES experiment 27.5 GeV electrons are scattered off an internal gas target. Presently a Recoil Detector is being build in order to detect recoiling target protons from exclusive processes. These reactions allow access to Generalized Parton Distributions which may ultimately lead to a determination of the hitherto unknown quark orbital angular momentum.

The innermost component of the Recoil Detector will be a silicon telescope that is being developed by DESY and the universities of Erlangen, Glasgow (Scotland) and Gent (Belgium). 8 modules (4 double layers) each build of two 10cm x10cm double-sided, 300 um thick silicon strip sensors will be located inside the beam vacuum in order to determine recoiling proton momenta from the energy loss in the telescope. The second goal of this detector is to provide two space points for higher energy particle tracks. Fulfilling both goals simultaneously requires a unique readout scheme with a large dynamic range.

The silicon detector’s construction, its readout scheme and results from a first prototype module will be presented.