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The PANDA experiment at the new FAIR facility at GSI in Darmstadt requires photo sensors which will be used in the DIRC detectors for particle identification. These devices must stand integrated anode charges of 5C/cm2 and be able to operate in high magnetic fields. Our planned sensors are microchannel-plate (MCP) photomultipliers (PMTs), whose lifetime has increased over the last few years. We have simultaneously illuminated recent-generation devices of different manufacturers (BINP, Hamamatsu R10754X-01-M16 and PHOTONIS XP85112/H1-AGL) under conditions at high energy physics like single photon detection with a gain of at least 106. Important aging parameters such as gain, dark count rate, and quantum efficiency (QE), are measured as a function of the integrated anode charge. Further the spatial QE degradation is determined in irregular intervals of several weeks. Although the illumination is still ongoing, the superior method to improve the lifetime appears to be atomic layer deposition (ALD), which is used for the XP85112/A1-HGL. In our measurements this device has passed 2.8C/cm2 without any sign of aging, surpassing previous MCP-PMT models by more than one order of magnitude.

Lifetime measurements of recent Microchannel-Plate PMTs