Title :
A comparative study of microstrip plate geometries as UV photosensors with reflective photocathodes: simulation
Author :
Freitas, D.S.A.P. ; Veloso, J.F.C.A. ; Dos Santos, J.M.F. ; Conde, C.A.N.
Author_Institution :
Dept. de Fisica, Coimbra Univ., Portugal
fDate :
6/1/2001 12:00:00 AM
Abstract :
A numerical simulation of eight microstrip plate geometries operated in 760 torr of xenon was performed. The cathode widths and anode-to-cathode gaps were varied while the anode widths were held constant at 10 μm. Avalanche multiplication factors as a function of position and total gains for all geometries were determined. Since optical positive feedback is a limiting factor in considering microstrip plates as vacuum ultraviolet (VUV) photosensors, the optical positive feedback of a CsI-coated microstrip plate used as a VUV photosensor for a gas proportional scintillator counter was estimated for all geometries. The geometry with the least optical positive feedback in this application was determined to have 160-μm cathodes and cathode-to-anode gaps of 55 μm
Keywords :
gas scintillation detectors; photocathodes; proportional counters; ultraviolet detectors; CsI-coated microstrip plate; UV photosensors; VUV photosensor; Xe; anode-to-cathode gap; avalanche multiplication factors; cathode width; gas proportional scintillator counter; microstrip plate geometries; numerical simulation; photocathodes; Biomedical optical imaging; Cathodes; Coatings; Detectors; Geometrical optics; Geometry; Microstrip; Optical feedback; Optical sensors; Physics;
Journal_Title :
Nuclear Science, IEEE Transactions on
