Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 52: Accelerators and Instrumentation I

HK 52.4: Vortrag

Mittwoch, 18. März 2009, 15:00–15:15, H-ZO 80

Tracking upgrade of the Crystal Barrel experiment at ELSA — •Alexander Winnebeck — Helmholtz-Institut für Strahlen- und Kernphysik, Nussallee 14-16, D-53115 Bonn

Double polarization photo-production experiments are performed with the Crystal Barrel experiment at ELSA in Bonn. The experimental set-up is dominated by an electromagnetic calorimeter, which is well suited for the investigation of multi-photon final states.

Detecting charged particles extends the capability of the set-up, and opens the field of charged and semi-charged reactions. An ideal detector for this task is a TPC, because it detects charged particles, determines their sign of charge and the transverse momentum, when a magnetic field is present. Combining this with the measured dE/dx allows particle identification for momenta up to ≈ 1 GeV/c.

Therefore a TPC is developed for the Crystal Barrel experiment. At first, a prototype chamber was tested in order to study resolution and further properties using an electron beam at ELSA. For these measurements a tracking test bench was set up with silicon strip detectors and planar GEM trackers.

First results of a test beam time will be presented.