Abstract
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 ¦η¦ < 0.9. It is designed for a maximum multiplicity dN/dy = 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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References
ALICE Collaboration: ALICE Technical Design Report of the Time Projection Chamber, CERN/LHCC 2000-001, 2000.
B.S. Nielsen, J. Westergaard, J.J. Gaardhoje, A. Lebedev, and ALICE TPC Collaboration: Design Note on the ALICE TPC laser calibration system, ALICE-INT-2002-022, 2002.
http://www.digi.com/
http://dim.web.cern.ch/dim/
ALICE Collaboration: ALICE Technical Design Report of the Transition Radiation Detector, CERN/LHCC 2001-021, 2001.
http://itcobe.web.cern.ch/itcobe/Services/Pvss/
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for the ALICE Collaboration
Presented in the Poster Session “Future Experiments and Facilities” at the 18th International Conference “Quark Matter 2005”, Budapest, Hungary, 4–9 August 2005.
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Renault, G., Nielsen, B.S., Westergaard, J. et al. The laser calibration system of the ALICE time projection chamber. Czech J Phys 55, 1671–1674 (2005). https://doi.org/10.1007/s10582-006-0057-y
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DOI: https://doi.org/10.1007/s10582-006-0057-y