Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 69: Instrumentation 19

HK 69.1: Group Report

Friday, March 27, 2015, 14:30–15:00, M/HS1

Triggering with the ALICE TRD: Results and Prospects — •Jochen Klein¹, Yvonne Pachmayer¹, and Uwe Westerhoff² for the ALICE collaboration — ¹Physikalisches Institut, University of Heidelberg — ²Institut fuer Kernphysik, Universitaet Muenster

The ALICE Transition Radiation Detector provides multiple level-1 trigger contributions. The signatures are based on tracks which are reconstructed in an FPGA array from chamber-wise track segments. The latter are calculated on the detector-mounted frontend electronics. The massive parallelization allows for the low latency trigger 8 us after the interaction.

We will show the performance of the triggers on electrons and jets during LHC Run 1. Further, we will discuss improvements and prospects for Run 2. In particular, an online calculation of the distance of closest approach to the primary vertex shall be used to reject the dominant background from the conversion of photons at large radii. The combination of tracks over stack and sector boundaries will help to improve the efficiency of the jet trigger.