Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 12: Poster Session: Instrumentation and Applications

HK 12.8: Poster

Tuesday, March 9, 2004, 13:30–15:30, Foyer

Fiber Array Detectors for HADES — •B. Spruck, R. Novotny, and V. Metag — II. Phys. Inst. Uni. Gießen, Heinrich-Buff-Ring 16, 35392 Gießen

The HADES detector at GSI is now ready to take data with a hydrogen target. For proton and pion induced reactions a high beam intensity is needed to get sufficient event rates. In order to reduce the trigger rates a start/veto detector system for high rates was developed and tested during a beam time in september 2003.

A good time resolutions (σ<500ps) and high granularity can be achieved by using an array of scintillating fibers with fast relaxation times and a diameter of 1mm. The light output is increased by using four layers of fibers. The fibers are read out with multi anode No-dqbooster basedNo-dq PMTs which are modified for linear output at high count rates.

The results from the proton beam run with these start/veto prototypes will be presented.

^* supported by GSI and BMBF.