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T: Fachverband Teilchenphysik

T 75: Detektorsysteme III

T 75.1: Vortrag

Mittwoch, 2. März 2016, 16:45–17:00, VMP8 SR 205

Micro-channel cooling for ATLAS silicon sensors — •Nils Flaschel and Kerstin Tackmann — Notkestraße 85, 22607 Hamburg

The ATLAS experiment at the LHC has been taking data since November 2009. The innermost tracking systems of the ATLAS detector are silicon pixel and strip detectors. In LHC experiments, the silicon detectors, which are positioned very close to the proton-proton interaction point, receive considerable radiation doses. The sensors need to be kept at low temperatures to keep the leakage current small, avoid thermal run-away and to avoid uncontrolled annealing. The cooling system typically adds a significant amount of material and hence radiation lengths to the detector. As part of the planned detector upgrade for the HL-LHC the ATLAS inner tracking system will be replaced by an all-silicon system, with a larger number of detector layers compared to the current detector, increasing the amount of material in the detector.

Micro-channel cooling is considered to be a promising technology to reduce the material per layer in current and future HEP detectors. As the channels are etched directly into silicon, the cooling system can be brought into direct thermal contact with the sensor.

A prototype micro-channel layout has been designed, produced and tested in collaboration with CNM in Barcelona. A test stand has been prepared to characterize both the thermal and mechanical properties of the micro-channel device. First results for the thermal properties and ongoing developments are presented.