Transient behaviour and rate effects in resistive detectors

Fraga, MM Marques, RF Ivaniouchenkov, Y de Lima, EP Neves, F Policarpo, AJPL Bueno, CC Goncalves, JAC Santos, MDD Costa, L Mendiratta, S Monteiro, JH

Mm. Fraga et al., Transient behaviour and rate effects in resistive detectors, NUCL INST A, 419(2-3), 1998, pp. 485-489

10

INGLESE

Article

Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT

0168-9002 → ACNP

419

2-3

1998

485 - 489

ISI

0168-9002(199812)419:2-3<485:TBAREI>2.0.ZU;2-Y

The dependence of the detection efficiency (or charge gain) of a resistive detector on the counting rate has been considered by several authors. The i nfluence of the resistivity of the electrodes, the counter geometry and the gas mixture composition have also been studied. Most of those measurements assume a stationary regime. In the present work we report on studies of th e transient behaviour of detectors with a resistive cathode for various cou nting rates, charge gains and detector geometries. We show that in some cas es the time-decay curves can be fitted by a single exponential plus a const ant term, while in others (higher charge gains or higher counting rates) a sum of two or even three exponentials plus the constant term is needed to f it the experimental data. A study of the electric properties of the dielect rics used is also presented and a comparison is made between these results and the data obtained under irradiation conditions. (C) 1998 Elsevier Scien ce B.V. All rights reserved.