Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 10: Instrumentation

HK 10.1: Talk

Monday, March 4, 2013, 11:00–11:15, WIL-A221

The CBM Time of Flight wall Free-streaming Readout — •Pierre-Alain Loizeau and Norbert Herrmann — Physikalisches Institut der Universität Heidelberg

The Compressed Baryonic Matter (CBM) experiment is planned to start operating in 2018 at the Facility for Antiproton and Ions Research (FAIR) in Darmstadt, Germany. This fixed target experiment will start taking data with incident beams of 2 to 11 AGeV for Au and up to 29 GeV for protons. Due to the high interaction rate of up to 10MHz, triggered systems would face some limitations and most detectors will have a free-streaming readout. Charged hadrons identification is provided by a Time of Flight wall based on MRPC detectors with a free-streaming readout chain including data reduction and aggregation.

As all input signals need to be transported, the bandwidth between each pair of elements of the readout is important. Studies of input and data rates at different levels were done with realistic detector design.

Two recent hardware developments were made on the digitizer part of the readout chain. A free-streaming mode for the HADES TRB3 board is developed. This allows to use the advantages of FPGA TDC in terms of channels per chip and time resolution. The first iteration of the GET4 TDC chip is also now available and was tested in beam with RPC prototypes in November 2012 at GSI Darmstadt.

Results from this beamtime and later tests will be presented. This includes a comparison between data selection based on a synchronization with a triggered system and selection based on the data themselves.

Supported by EU/FP7 WP2 and BMBF 06HD9121I.