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Recent improvements to RC ‐line encoded position‐sensitive proportional counters
Author(s) -
Borkowski C. J.,
Kopp M. K.
Publication year - 1978
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889878013540
Subject(s) - resistive touchscreen , optics , amplifier , physics , position (finance) , scattering , materials science , electronic circuit , electrical engineering , optoelectronics , engineering , cmos , quantum mechanics , economics , finance
Continuing research on the principles of position encoding with RC lines has advanced the design of position‐sensitive proportional counters (PSPCs) to meet the requirements for high count rates (> 10 5 counts s −1 ) and good spatial resolution (> 10 4 spatial elements) in small‐angle scattering experiments with X‐rays and neutrons. Development and operation are now reported for (1) low‐noise preamplifiers with pole‐zero cancellation in the feedback circuit and modular linear amplifiers with passive RCL shaping to reduce output saturation at high count rates and to shorten the position‐signal processing time, (2) resistive self‐heating and propylene decomposition to increase the conductance and film thickness of pyrolytic carbon anodes and to reduce the effects of electron erosion at high count rates. (3) technology for large‐area PSPCs (> 60 × 60 cm) for the measurement of small‐angle scattering with neutrons, and (4) a method of electronic thickness discrimination to change the effective thickness of area PSPCs and to increase the signal‐to‐background ratio.