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RESEARCH PRODUCT

Recent results with lifetime enhanced microchannel-plate photomultipliers

T. KeriE. EtzelmüllerA. HayrapetyanM. ZühlsdorfA. GerhardtW. LauthS. SchlimmeB. KröckK. KreutzfeldC. SchwarzA. BeliasMichaela ThielJ. SchwieningMichael DürenD. LehmannKlaus PetersW. EyrichK. GötzenF. NerlingG. KalicyM. SchmidtM. KrebsG. SchepersM. BöhmT. WasemM. PatsyukR. DzhygadloPatrick AchenbachM. PfaffingerJ. RiekeK. FöhlF. UhligL. SchmittM. HoekA. BrittingEuan N. CowieO. MerleM. CardinaliA. AliA. LehmannConcettina SfientiM. Traxler

subject

PhysicsNuclear and High Energy PhysicsPhotomultiplierPhoton010308 nuclear & particles physicsbusiness.industry01 natural sciencesCathode030218 nuclear medicine & medical imagingAnodelaw.invention03 medical and health sciencesAtomic layer deposition0302 clinical medicineOpticsDetection of internally reflected Cherenkov lightlaw0103 physical sciencesQuantum efficiencyMicrochannel plate detectorbusinessInstrumentation

description

Abstract The favored photon sensors for the DIRC (detection of internally reflected Cherenkov light) detectors at the PANDA (Anti-proton Annihilation at Darmstadt) experiment at FAIR (Facility for anti-proton and ion research) are micro-channel-plate photomultipliers (MCP-PMTs). The main problem until a few years ago was the limited lifetime of the MCP-PMTs caused by a rapid decrease in quantum efficiency (QE) of the photo cathode (PC) with increasing integrated anode charge (IAC). These limitations are overcome by applying an atomic layer deposition (ALD) coating on the MCPs, as recently done by PHOTONIS and Hamamatsu. During the last years’ tests of lifetime enhanced MCP-PMTs were performed and their results were compared. For this, the QE was measured in dependence of the IAC as function of the wavelength and position dependent across the PC. The best performing tubes show a lifetime increase compared to not enhanced devices by a factor > 50 with an IAC > 13 C ∕ cm 2 . Additionally, performance results of new 2  inch Hamamatsu tubes and a new high QE PHOTONIS tube are presented.

yearjournalcountryeditionlanguage
2018-12-01Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
https://doi.org/10.1016/j.nima.2017.10.084