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Résumé du preprint DAPNIA-07-298

DAPNIA-07-298

Laser monitoring system for the CMS lead tungstate crystal calorimeter

M. Anfreville, D. Bailleux, J.-P. Bard, A. Bornheim, C. Bouchand,E. Bougamont, M. Boyer, R. Chipaux, V. Daponte-Puill, M. Dejardin, J.-L. Faure, P. Gras, P.Jarry, C. Jeanney, A. Joudon,J.-P. Pansart, Y. Penichot, J. Rander, J. Rolquin, J.-M. Reymond, J. Tartas,P. Venault, P. Verrecchia,L. Zhang, K. Zhu, R.-Y. Zhu

We report on the multiple wavelength laser monitoring system designed
for the CMS lead tungstate crystal calorimeter. Results are presented for the
test beam performance of the system designed to achieve  0.2% relative optical
transmittance inter-calibration for 75 848 lead tungstate crystals. The system
cycles continuously over the calorimeter to follow each crystal\'s evolution
under the irradiation and recovery periods foreseen during operation at the LHC.

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