Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 30: Instrumentation 10

HK 30.4: Talk

Tuesday, March 24, 2015, 18:00–18:15, M/HS1

The GBT based readout concept for the Silicon Tracking System of the CBM experiment — •Joerg Lehnert for the CBM collaboration — GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany

The Silicon Tracking System (STS) of the CBM experiment at FAIR is designed to handle interaction rates up to 10 MHz with hundreds of tracks in fixed target heavy ion collisions of up to 35 AGeV.

STS data will be read out from 14000 ASICs on 1800 frontend boards (FEBs) with a total of 1.8 million channels operating at rates from below 15 up to 1000 kHz and located in the STS detector box inside the CBM magnet with challenging conditions in terms of available space, radiation, magnetic field and temperature.

ASICs from 1, 2 or 5 FEBs operated at varying sensor potential will be connected via AC-coupled 320 MHz LVDS links to a readout board (ROB) employing radiation hard GBTX and Versatile Link components developed at CERN for data aggregation and optical readout. The approximately 1000 ROBs will be located inside the STS detector box, 4000 optical links will be routed from there to the subsequent FPGA based CBM data processing board (DPB).

The concept of the GBT based readout including connection scheme and custom protocol will be presented and an outlook on the ROB prototype will be given.