Abstract
Abstract
Spectroscopic scintillation detector form factors have been
guided primarily by the design of commercially available photonic
sensors. These devices, such as photomultiplier tubes, silicon
photomultipliers, and hybrid photodetectors have underperformed in
one or more areas such as size, power consumption, and resolution. A
novel photomultiplier tube having a 50.8×152.4 mm2
rectangular window, utilizing a reflection-mode photocathode, and a
low-gain, miniaturized dynode set is considered here to improve
photosensor packaging while enabling high-efficiency, low-resolution
scintillation spectroscopy with large, planar scintillators. Using a
phenomenological multiphysics simulation process informed by
empirical data, photoelectron collection efficiency,
single-photoelectron response, electron transit time, and transit
time spread have been modeled over a range of operating
potentials. At 750 V between the photocathode and anode, 72.5% of
photoelectrons are collected at the first dynode, and the average
gain is estimated to be 805. The most probable transit time is
14.9 ns, with a transit time spread of 2.7 ns full-width at
half-maximum.