Mainz 2012 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 34: Instrumentation

HK 34.6: Talk

Wednesday, March 21, 2012, 18:15–18:30, P 2

A Free-Streaming Readout for the CBM Time of Flight wall — •Pierre-Alain Loizeau and Norbert Herrmann — Physikalisches Institut der Universität Heidelberg

The Compressed Baryonic Matter (CBM) experiment will be built at the new Facility for Antiproton and Ions Research (FAIR) in Darmstadt, Germany. This fixed target experiment will investigate Heavy Ion collision up to 35 AGeV for Au beams and 89 GeV for protons beams, with high interactions rates: up to 10MHz in Au+Au collision at 25 AGeV. To avoid the limitations of triggered systems at such rates, most CBM detectors will operate a free-streaming readout.

Charged hadrons identification, especially a Kaons-Pions separation up to 3.5 GeV/c, is provided by its Time of Flight wall. This requires a time resolution for the full system in the order of 80ps. The wall is made of MRPC detectors with resistive materials and channel layout adapted to the different rates found in polar angles of 2.5^∘ to 25^∘. Hit rates up to 200 kHz/channel are expected. Thus electronic with a time resolution of 30 to 40ps, Time over Threshold capability and free-streaming readout is required. This free-streaming mode also require a special care in the synchronization of the system and the data analysis.

A first prototype of the full high resolution, free-streaming chain was build in Heidelberg, from differential detector to dedicated softwares. It was tested in beam at COSY in Jülich last November, in a hybrid system with triggered systems. It will be described in this contribution and its first in-beam performances will be presented.

Supported by EU/FP7 WP2 and BMBF 06HD9121I.