Ag. Weisenberger et al., OPTIMIZATION OF THE USE OF SMALL INEXPENSIVE SIDE-WINDOW PHOTOMULTIPLIER TUBES FOR SCINTILLATOR READOUT, IEEE transactions on nuclear science, 41(4), 1994, pp. 708-712
The 931B is a small inexpensive side-window photomultiplier tube (PMT)
which has recently been found to be useful for the readout of scintil
lators. We present the results of a study to obtain improved performan
ce from the PMT by facilitating the transport of light to the reflecti
on type photocathode. Particular attention is given for the use of the
se PMTs for the readout of light guides, waveshifting and scintillatin
g fibers. A CCD camera was positioned behind a glass envelope to simul
ate the photocathode to aid in quantifying the optimum combination of
optical coupling and aiming of the fiber. We will also report on tests
comparing a similar side-window PMT, the Thorn EMI model 9781B to the
931B. Tests on the operation of the side-window PMT at several orient
ations in a uniform magnetic field will also be reported. Comparisons
between the side-window PMT and a RCA 31000M head-on tube will also be
reported.