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The CMS ECAL Laser Monitoring System

Bornheim, A. (2009) The CMS ECAL Laser Monitoring System. Nuclear Physics B - Proceedings Supplements, 197 (1). pp. 219-223. ISSN 0920-5632.

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The high precision lead tungstate electromagnetic calorimeter of the CMS detector has started to operate in 2008. To ensure the stability of the calorimetric response at a level of a few per mille, every channel of the detector is monitored with a laser monitoring system. This system allows to measure fluctuations in the detector response with high precision, in particular the expected radiation induced changes of the crystal transparency which are on the level of several per cent at nominal luminosity. We briefly review the layout of the system and give an overview of test beam results obtained during the design and construction phase of the CMS ECAL. To allow continuous monitoring of all the crystals the interplay between the CMS DAQ, the ECAL DAQ as well as the laser source has to be carefully tuned. The implementation and experience with this system during the 2008 commissioning and operation of CMS is described.

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Bornheim, A.0000-0002-0128-0871
Additional Information:© 2009 Elsevier. On behalf of the CMS ECAL Collaboration. Available online 21 February 2010.
Issue or Number:1
Record Number:CaltechAUTHORS:20100618-102031974
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18733
Deposited By: Jason Perez
Deposited On:18 Jun 2010 20:56
Last Modified:09 Mar 2020 13:18

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