April 20, 2005
Super B Factory Workshop, Hawaii
Peter Križan, Ljubljana
Resolution and number
of photons (clusters)
Burle MCP PMT beam test 2
● sJ~13 mrad (single cluster)
● number of clusters per track N ~ 4.5
● sJ~ 6 mrad (per track)
-> ~ 4 s p/K separation at 4 GeV/c
Operation in high magnetic field:
●the present tube with 25mm pores only works up to 0.8T, for 1.5T need ~10mm
Number of photons per ring: too small. Possible improvements:
●bare tubes (52%->63%)
●increase active area fraction (bare tube 63%->85%)
●increase the photo-electron collection efficiency
(from 60% at present up to 70%)
-> Extrapolation from the present data 4.5 ->8.5 hits per ring
sJ: 6 mrad -> 4.5 mrad (per track)
           -> >5 s p/K separation at 4 GeV/c
Aging of MCP-PMTs ?
Open questions