Gießen 2007 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 51: Elektromagnetische und Hadronische Sonden

HK 51.5: Talk

Thursday, March 15, 2007, 18:00–18:15, C

a scintillating fibre tracker for the hermes recoil detector — •weilin yu — heinrich-buff-ring 16 35392 giessen

To study hard exclusive processes which provide access to generalised parton distributions (GPDs) and hence to the orbital angular momentum of quarks, a new Recoil Detector was installed as an upgrade of the HERMES spectrometer. The Recoil Detector consists of three components: a silicon detector surrounding the target cell inside the beam vacuum, a scintillating fibre tracker and a photon detector. All three detectors are located inside a solenoidal magnet which provides a 1 T longitudinal magnetic field. The scintillating fibre tracker provides position measurements of recoiling particles of momenta higher than 250MeV/c. It consists of two barrels of 1mm scintillating fibres arranged in 4 layers. Presently the Recoil Detector is fully commissioned and operating. Data taking will continue until the final HERA shutdown in July of 2007.