Münster 2011 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 55: Instrumentierung X

HK 55.3: Talk

Thursday, March 24, 2011, 14:45–15:00, HS2

The CBM Time of Flight wall electronic readout chain — •Pierre-Alain Loizeau and Norbert Herrmann — Physikalisches Institut, Universität Heidelberg, Germany

To achieve the particle identification goals needed by its physics program, the Compressed Baryonic Matter (CBM) experiment at FAIR requires a time resolution better than 80ps for its Time of Flight (ToF) wall. Because of Multi-gaps Resistive Plate Chambers (MRPC) properties, the limit in the total electronic chain resolution is then 40ps. To follow the general concept of the CBM detector readout, the wall also has to operate in a self-triggered mode, where each hit is readout independently and receives a time stamp.

The current demonstrator consists of the high bandwidth preamplifier discriminator PADI, the event driven TDC GET4, a clock system, a Readout controller with a dedicated firmware and the CBM software environment. To suppress common mode sensitivity, both detector and front-end are kept strictly differential. An external reference signal is additionally inserted in the data stream at the TDC level to allow an easier data reconstruction.

This chain was tested in beam with a differential MRPC at the COSY synchrotron in Jülich last November. The results from this test will be presented.

This work was supported by BMBF 06HD9121I.