The gain of the Philips XP2972 phototube was measured as a function of time and anode current using 3456 tubes in conditions simulating the experimental situation at the CERN SPS. After an initial ageing period of 35 h, the mean gain variation was measured to be 0.7% with an rms of 0.5% over 12 h at constant anode current (Ia=1.6 μA). At an approximately constant gain of 2.2×105, the majority (88%) of the tubes show an increase in gain with an average of 1.6% and an rms of 1.1% when the anode current rises from about 10 nA to 1.6 μA. These characteristics were used to select and distribute the tubes on the electromagnetic calorimeter of the CERN WA70 experiment. Short term instability and photocathode homogeneity were studied on a reduced sample.
STUDY OF THE PERFORMANCE OF A LARGE SAMPLE OF PHILIPS PHOTOMULTIPLIERS TYPE-XP2972 / M. BONESINI, E. BONVIN, P. BOOTH, L. CARROLL, D. CAVALLI, G. CECCHET, G. COSTA, P. DORSAZ, D. EDWARDS, J. FISCHER, L. FLURI, D. FRAME, S. JACK, J. JACKSON, M. KELLY, M. KIENZLEFOCACCI, R. LUCOCK, J. LYNCH, E. MACAVERO, L. MANDELLI, M. MARTIN, L. MATHYS, A. MAXWELL, M. MAZZANTI, J. MYERSCOUGH, P. NEGUS, S. PENSOTTIRANCOITA, L. PERINI, D. PERRIN, W. RANGE, J. RUTSCHMANN, L. ROSSELET, S. SNOW, M. TAMBORINI, A. THOMPSON, R. TURNBULL, J. WELLS, M. WERLEN. - In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT. - ISSN 0168-9002. - 264:2-3(1988), pp. 205-212.
STUDY OF THE PERFORMANCE OF A LARGE SAMPLE OF PHILIPS PHOTOMULTIPLIERS TYPE-XP2972
L. PERINI;
1988
Abstract
The gain of the Philips XP2972 phototube was measured as a function of time and anode current using 3456 tubes in conditions simulating the experimental situation at the CERN SPS. After an initial ageing period of 35 h, the mean gain variation was measured to be 0.7% with an rms of 0.5% over 12 h at constant anode current (Ia=1.6 μA). At an approximately constant gain of 2.2×105, the majority (88%) of the tubes show an increase in gain with an average of 1.6% and an rms of 1.1% when the anode current rises from about 10 nA to 1.6 μA. These characteristics were used to select and distribute the tubes on the electromagnetic calorimeter of the CERN WA70 experiment. Short term instability and photocathode homogeneity were studied on a reduced sample.
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