The Laser Calibration System of the ALICE Time Projection Chamber

Details The Laser Calibration System of the ALICE Time Projection Chamber The Laser Calibration System of the ALICE Time Projection Chamber

2005-11-07

arxiv.org/abs/nucl-ex/0511014v1

Czech.J.Phys.55:1671-1674,2005

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 3 figures

Scientific paper

10.1007/s10582-006-0057-y

A Large Ion Collider Experiment (ALICE) is the only experiment at the Large Hadron Collider (LHC) dedicated to the study of heavy ion collisions. The Time Projection Chamber (TPC) is the main tracking detector covering the pseudo rapidity range $|\eta|< 0.9$. It is designed for a maximum multiplicity \dNdy = 8000. The aim of the laser system is to simulate ionizing tracks at predifined positions throughout the drift volume in order to monitor the TPC response to a known source. In particular, the alignment of the read-out chambers will be performed, and variations of the drift velocity due to drift field imperfections can be measured and used as calibration data in the physics data analysis. In this paper we present the design of the pulsed UV laser and optical system, together with the control and monitoring systems.

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