Heidelberg 2007 – scientific programme

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T: Fachverband Teilchenphysik

T 514: Trigger und DAQ III

T 514.6: Talk

Friday, March 9, 2007, 15:15–15:30, INF 327 SR 6

High integration and low cost read out system for COMPASS RICH detector — •Igor Konorov, Heinz Angerer, Sergei Gerassimov, Bernhard Ketzer, Alexander Mann, and Stephan Paul — TU Muenchen, Physik Department, E18

One of the central detectors of the COMPASS experiment at the SPS at CERN is the RICH detector. The detector provides hadron particle identification up to 50 GeV/c and covers a very big acceptance of 500mrad in the horizontal and 360mrad in the vertical plane. In the central region the Cherenkov photons are detected by multi-anode photomultiplier tubes, while in the remaining 75% of the total active area by MWPCs with CsI photocathodes.

For the 2006 run a new read out system of the MWPCs, based on the APV25 high integration chip, was developed and installed. The new system reads more than 62000 detector channels. The system features a good single photon detection efficiency due to low noise performance and small ballistic deficit of charge collection, high trigger rate capability - more than 50kHz, and low cost. Although the MWPC signal is very slow the system allows us to measure a signal time with a resolution of 30 ns, thus reducing the out of time background to negligible level.

The RICH detector, equipped with the new read out system, has performed succesfully during 2006 data taking run. The architecture of the system as well as first performance results of the RICH detector will be discussed.

This work is supported by BMBF and Maier-Leibnitz-Labor.