Freiburg 2008 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 61: Detektorsysteme I

T 61.6: Gruppenbericht

Montag, 3. März 2008, 18:00–18:20, KGI-HS 1019

The HERMES Recoil Detector — •Weilin Yu — II. Physikalisches Institut, JLU Gießen, Heinrich-Buff-Ring 16, 35392 Gießen

The HERMES Collaboration at HERA constructed and installed a new Recoil Detector to upgrade the existed spectrometer. This detector is designed to measure recoil protons in hard exclusive processes which provide access to the orbital angular momentum of quarks. The Recoil Detector consists of a silicon detector surrounding the target cell inside the beam vacuum, a scintillating fiber tracker and a photon detector. All three detectors are located inside a solenoidal magnet which provides a 1 T longitudinal magnetic field. The Recoil Detector was installed in January 2006 and data taking lasted until the end of HERA operation in June 2007. Results on the detector performance will be presented here.