Comparison of PMTs from three different manufacturers for the CMS-HF forward calorimeter

• Published in: IEEE transactions on nuclear science Vol. 51; no. 4; pp. 1909 - 1915
• Main Authors: Akgun, U., Anderson, E.W., Ayan, A.S., Gulmez, E., Miller, M., Onel, Y., Schmidt, I., Winn, D.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-08-2004; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Collision mitigation; Current measurement; Dark current; Electromagnetic interference; Electron tubes; Gain measurement; Hafnium; Manufacturing; Physics; Timing
• ISSN: 0018-9499; 1558-1578
• DOI: 10.1109/TNS.2004.832681

The builders of the CMS forward hadron calorimeter established a set of specifications for readout PMTs that reflected the physics goals and mechanical needs of the CMS experiment. Three manufacturers, Hamamatsu, Photonis (Philips), and Electron Tubes (EMI), provided candidate PMTs based on these initial requirements. Timing, gain, dark current properties, and single photoelectron spectra of these candidate PMTs were measured. Results show that Hamamatsu PMTs (R7525HA) conform best to the specifications of the Hadron-Forward (HF) Calorimeter.