Monitoring the Stability of the ALEPH Vertex Detector

Details Monitoring the Stability of the ALEPH Vertex Detector Monitoring the Stability of the ALEPH Vertex Detector

1999-03-18

arxiv.org/abs/physics/9903031v1

Nucl.Phys.Proc.Suppl. 78 (1999) 301-306

Physics

Instrumentation and Detectors

6 pages, 9 figures, to be published in proceedings of "6th International Conference on Advanced Technology and Particle Physic

Scientific paper

10.1016/S0920-5632(99)00561-7

The ALEPH Silicon Vertex Detector features an optical fibre laser system to monitor its mechanical stability. The operating principle and the general performance of the laser system are described. The experience obtained during 1997 and 1998 operations confirms the important role that such a system can have with respect to the detector alignment requirements. In particular, the laser system has been used to monitor short-term temperature-related effects and long-term movements. These results and a description of the laser-based alignment correction applied to the 1998 data are presented.

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