Monitoring light source for CMS lead tungstate crystal calorimeter at LHC

Author

Zhang, Liyuan Y. ; Zhu, Kejun J. ; Zhu, Ren-Yuan ; Liu, Duncan T.

Author_Institution

California Inst. of Technol., Pasadena, CA, USA

Volume

48

Issue

3

fYear

2001

fDate

6/1/2001 12:00:00 AM

Firstpage

372

Lastpage

378

Abstract

Light monitoring will serve as an intercalibration for Compact Muon Solenoid (CMS) lead tungstate crystals in situ at the Large Hadronic Collider, which is crucial for maintaining crystal calorimeter´s subpercent constant term in the energy resolution. This paper presents the design of the CMS electromagnetic calorimeter monitoring light source and high-level distribution system. The correlations between variations of the light output and the transmittance for the CMS choice of yttrium-doped PbWO₄ crystals were investigated and were used to study monitoring linearity and sensitivity as a function of wavelength. The monitoring wavelength was determined so that a good linearity as well as adequate sensitivity can be achieved. The performance of a custom manufactured tunable laser system is presented. Issues related to monitoring precision are discussed

Keywords

X-ray detection; calibration; lead compounds; particle calorimetry; solid scintillation detectors; yttrium; CMS crystal calorimeter; Compact Muon Solenoid; LHC; Large Hadronic Collider; PbWO₄:Y; custom manufactured tunable laser system; electromagnetic calorimeter; high-level distribution system; intercalibration; light output variations; light source monitoring; linearity; monitoring precision; sensitivity; transmittance; Collision mitigation; Crystals; Energy resolution; Light sources; Linearity; Manufacturing; Mesons; Monitoring; Solenoids; Yttrium;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.940083

Filename

940083