The quantum efficiency of standard bialkali photocathode is currently limited to around 25% at the spectral peak. Many photomultipliers manufactures have recently developed large area photomultipliers with new super bialkali photocathode which improves quantum efficiency up to 35%. In this paper the characterization of large area photomultipliers with super bialkali photocathode produced by Hamamatsu is reported, to compare their performances to those measured on standard bialkali R7081 PMTs with the same mechanical design. Time and charge characteristics, fraction of spurious pulses and dark count, uniformity and ageing effects were measured in order to define whether the new kind of photocathode could introduce some secondary effects.
Study on large area photomultipliers with super bialkali photocathode
Lo Presti D.;
2012-01-01
Abstract
The quantum efficiency of standard bialkali photocathode is currently limited to around 25% at the spectral peak. Many photomultipliers manufactures have recently developed large area photomultipliers with new super bialkali photocathode which improves quantum efficiency up to 35%. In this paper the characterization of large area photomultipliers with super bialkali photocathode produced by Hamamatsu is reported, to compare their performances to those measured on standard bialkali R7081 PMTs with the same mechanical design. Time and charge characteristics, fraction of spurious pulses and dark count, uniformity and ageing effects were measured in order to define whether the new kind of photocathode could introduce some secondary effects.| File | Dimensione | Formato | |
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