Commissioning of the ALICE Muon Spectrometer Trigger at LHC

Abstract : ALICE (a large ion collider experiment) is the LHC experiment dedicated to the study of ultra-relativistic heavy ion collisions. The ALICE muon spectrometer covers a large range in pseudo-rapidity and is designed to study quarkonia and heavy flavours decaying into (di-)muons. The high particle multiplicities environment in such collisions require a specific, fast and efficient trigger system, the muon trigger. It consists of four planes of RPC detectors, covering an area of 36 m2 each, 21k front-end channels and a fast-decision electronics. The muon trigger is designed to reconstruct (muon) tracks and deliver a trigger signal each 25 ns (40 MHz) with a total latency of 800 ns. The hit position on the RPC is measured in two orthogonal directions with an accuracy of about 1 cm. The performance measured with the first p–p collisions at sqrt (s)= 900 GeV carried out in December 2009 is reported.
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Submitted on : Tuesday, November 2, 2010 - 4:33:05 PM
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S. Ahn, R. Arnaldi, Y.W. Baek, A. Baldit, V. Barret, et al.. Commissioning of the ALICE Muon Spectrometer Trigger at LHC. X Workshop on Resistive Plate Chambers and Related Detectors, Feb 2010, Darmstadt, Germany. 4p., ⟨10.1016/j.nima.2010.08.123⟩. ⟨in2p3-00531413⟩



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