Tests of the Burle 85011 64-anode MCP PMT as a detector of Cherenkov photons

An upgrade of the particle identification system of the Belle detector is envisaged. In the search for an optimal photon detector, the performance of the Burle 85011 64-anode, multichannel plate PMT has been tested. The Cherenkov angle resolution and photon yield have been measured with pion beams at KEK, while the position and incident angle dependence of surface sensitivity have been measured on the bench.