The laser system for calibration and monitoring of the OPAL jet chamber

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Abstract

In this report we describe the construction and performance of the laser system which was used in Summer 1989 for the initial calibration of the OPAL jet chamber after installation on the LEP beam axis and which has served as a monitoring tool since then. Two Nd: YAG lasers are used to generate 48 high precision double beams which enter the chamber at fixed positions. The main features of the roughly 450 optical components are described and the beam alignment procedures are explained. Results are given for jet chamber calibration constants such as drift velocity, Lorentz angle, and residual sagittas.

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    Now at Philips Hamburg, D-2000 Hamburg, Germany.

    2

    Now at DESY, D-2000 Hamburg 52, Germany.

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