CERN Accelerating science

Article
Title	The performance of prototype vacuum phototriodes in the first full sized supercrystal array for the CMS ECAL endcaps
Author(s)	Apollonio, M ; Barber, G ; Bell, K W ; Britton, D I ; Brooke, J J ; Brown, R M ; Bourotte, J ; Camanzi, B ; Cockerill, D J A ; Davies, G ; Devitsin, E G ; Ergun, G ; Gninenko, S ; Golubev, N A (INR, Moscow, Russia) ; Goussev, Y ; Haguenauer, Maurice ; Head, R ; Heath, H ; Hobson, P R ; Imrie, D C ; Inyakin, A V ; Katchanov, V A ; Kirsanov, M ; Lintern, A ; Lodge, A ; McLeod, E ; Nash, S ; Newbold, D ; Ukhanov, M ; Postoev, V ; Patalakha, D I ; Presland, A ; Probert, M ; Seez, Christopher J ; Semeniouk, I N ; Seliverstov, D M ; Smith, B ; Sproston, M ; Tapper, R ; Tchuiko, B
Affiliation	(Rutherford Appleton Laboratory, Chilton, Didcot, Oxon 0X11 0QX, United Kingdom)
Publication	2004
In:	Nucl. Instrum. Methods Phys. Res., A 532 (2004) pp.566-574
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; CMS
Abstract	The performance of prototype vacuum phototriodes is presented from the first full sized supercrystal array for the CMS ECAL endcaps. The array was exposed to high-energy electrons and tested in magnetic fields of up to 3T, in the CERN North area, in July and August 1999. The mean VPT electron yield, normalised to a naked crystal light yield of 8 photoelectrons/MeV into an HPMT, was found to be 25 electrons/MeV at 3 T for devices from Research Institute Electron, 35 electrons/MeV for devices from Hamamatsu and 18/23 electrons/MeV from Electron Tubes.

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