Hamamatsuhasrecentlydevelopedalargeareaphotomultiplier(10in.)withanewsuperbialkali photocathodethatimprovesquantumefficiencyto35%.Performancesweremeasuredwithagainof 5107 in responsetosinglephotoelectronsandwerecomparedtothemeasurementstakenon72 standardbialkaliR7081PMTs.Theresultsconfirmedanincreaseinquantumefficiencyofupto39% with respecttothestandards.Inordertodefinewhetherthenewtechnologyintroducessecondary effects, timeandchargecharacteristics,fractionofspuriouspulsesanddarkcountrateweremeasured. The maineffectswereanincreaseinthedarkcountrateandinthetype2afterpulsefraction.Itwas also foundthatthefractionoftype2afterpulsedecreaseslinearlywiththegaindecrease.Thelocal measurementsconfirmedthattheuniformityofthesuperbialkaliphotocathodedidnotdeteriorate when comparedwithstandard.
Performances of four superbialkali large area photomultipliers with respect to the standard R7081
LO PRESTI, DOMENICO
2011-01-01
Abstract
Hamamatsuhasrecentlydevelopedalargeareaphotomultiplier(10in.)withanewsuperbialkali photocathodethatimprovesquantumefficiencyto35%.Performancesweremeasuredwithagainof 5107 in responsetosinglephotoelectronsandwerecomparedtothemeasurementstakenon72 standardbialkaliR7081PMTs.Theresultsconfirmedanincreaseinquantumefficiencyofupto39% with respecttothestandards.Inordertodefinewhetherthenewtechnologyintroducessecondary effects, timeandchargecharacteristics,fractionofspuriouspulsesanddarkcountrateweremeasured. The maineffectswereanincreaseinthedarkcountrateandinthetype2afterpulsefraction.Itwas also foundthatthefractionoftype2afterpulsedecreaseslinearlywiththegaindecrease.Thelocal measurementsconfirmedthattheuniformityofthesuperbialkaliphotocathodedidnotdeteriorate when comparedwithstandard.| File | Dimensione | Formato | |
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