The design of the cooling system for the CMS Barrel Electromagnetic Calorimeter

Author

Teller, Olivier

Author_Institution

PH-CMA group, CERN, Geneva

Volume

1

fYear

2006

fDate

Oct. 29 2006-Nov. 1 2006

Firstpage

430

Lastpage

434

Abstract

CMS is one of the four experiments being constructed for the LHC. The electromagnetic calorimeter (ECAL) is made of lead tungstate (PbWO₄) crystals. Scintillation light from the crystals in the barrel is detected by avalanche photo diodes (APD). The number of scintillation photons emitted by the crystals and the amplification of the APD are both temperature dependent. Keeping the constant term of the energy resolution (the contribution to the fractional energy resolution which is independent of energy) below a few tenths of percent requires the temperature of crystals and APDs to be stabilized to within 0.057 K. In this contribution, we describe the innovative solutions which have been developed and implemented to achieve this performance.

Keywords

cooling; particle calorimetry; solid scintillation detectors; CMS barrel electromagnetic calorimeter; Compact Muon Solenoid; LHC; Large Hadron Collider; PbWO₄; avalanche photodiodes; lead tungstate; Collision mitigation; Detectors; Electronics cooling; Energy resolution; Large Hadron Collider; Lead; Photonic crystals; Samarium; Temperature sensors; Thermal stability;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record, 2006. IEEE

Conference_Location

San Diego, CA

ISSN

1095-7863

Print_ISBN

1-4244-0560-2

Electronic_ISBN

1095-7863

Type

conf

DOI

10.1109/NSSMIC.2006.356190

Filename

4179029