Derivation of a simple analytical expression of the gain of pure argon filled CAT proportional counters

In previous publications, we described the intrinsic properties of CAT detectors, formed as a unique or a collection of individual single holes (gas proportional pixel detector). In our last paper, we have shown that the calculated gain of the avalanche along the electric field lines was dependent o...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2000-02, Vol.440 (2), p.466-470
Main Authors: Chaplier, G, Lemonnier, M, Megtert, S
Format: Article
Language:English
Subjects:
Argon
Avalanche
Computerized tomography
Detector
Electric fields
Gain measurement
Gas detectors
Mathematical models
Photons
Proportional counter
Rare gas
X rays
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Summary:In previous publications, we described the intrinsic properties of CAT detectors, formed as a unique or a collection of individual single holes (gas proportional pixel detector). In our last paper, we have shown that the calculated gain of the avalanche along the electric field lines was dependent on the distance of photon absorption with respect to the symmetry axis of a single hole. On the contrary, the measured gain did not follow this dependence and it was suggested that the gain of the detector was similar to the one measured along the hole symmetry axis, irrespective of the shape of the off-axis electric field lines. We present here a simple calculation of the on-axis gain of such structures that corresponds to the measurements and takes into account the detector geometry.
ISSN:0168-9002
1872-9576
DOI:10.1016/S0168-9002(99)00956-0