E949 Trigger Counter PMTs
E949 Trigger Counter PMTs
Two PMTs were considered for the E949 T-counters. One option was the same tube that
E787 used for direct readout of the old BC408 T-counters , the Hamamatsu
R1398 . This PMT is not
green-extended.
The fianl choice was for the Russian-made FEU-115M; this tube is also used by
PHENIX (some info in Instr. Expt. Tech. 40 p333
p334 p335 p336
p337 .
The FEU-115M PMTs are green extended, and have similar physical dimensions to the
E787 T-counter PMTs
(HPK R1398 ).
The 115M have better QE in the green, but somewhat worse s.p.e. resolution.