Abstract
A gas detector made of three parallel electrodes (bakelite electrode and two metallic mesh electrodes) and working in proportional mode allows monitoring of the gas gain under various intensities of X-rays over long period of time. The detector performance, when irradiated with an intense radiation flux, and possible effects of variation of the bakelite electrode conductivity on a medium-term stability of operation are reported. The results shown in this paper were obtained for detector filled with argon/isobutane gas mixture.
Highlights
Many experiments will be equipped with Resistive Plate Chambers (RPC) [1] – gas detectors allowing large detection system construction at moderate cost
It is well understood that the dynamic voltage drop across the gas gap due to the avalanche current becomes significant even at moderate avalanche rates when a RPC is made out of high resistivity bakelite [3, 4]
It was demonstrated that low resistivity bakelite plates (108 1010 cm) are suitable for stable and fully efficient operation of RPCs at high counting rates [6, 7], the data concern the short and medium-term stability of the detector only
Summary
Many experiments will be equipped with Resistive Plate Chambers (RPC) [1] – gas detectors allowing large detection system construction at moderate cost. Large scale experiments at LHC require good stability of operation of the detectors (i.e. efficiency, time resolution) over many years of operation under high radiation flux [2]. It was demonstrated that low resistivity bakelite plates (108 1010 cm) are suitable for stable and fully efficient operation of RPCs at high counting rates [6, 7], the data concern the short and medium-term stability of the detector only. The effect of the reduced efficiency at high radiation flux of high resistivity RPCs was measured [8, 9]. Quantitative investigation of the gas gain as a function of avalanche rate during long-time exposures is crucial for good understanding of the detector operation since it provides a measurement of the electrodes’ resistivity fluctuation in the working conditions of the detector.
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