Abstract
We studied ageing effects of Thin Gap Chambers (TGC). The gas mixture was 55% of CO2 and 45% of n-pentane. The TGCs were irradiated with β-rays of a 90Sr source. The maximum hit rate per wire was 41–84kHz/cm. The gas flow rate was equivalent to replacing 0.3–2.6 of the TGC volume per minute. We observed neither significant deterioration on pulse height nor time jitter up to an accumulated charge of 1C/cm. We also performed a beam test to study the TGC performance under a high radiation environment. The maximum background rate of approximately 3.8MHz/cm2 was achieved using a 90Sr source. The pulse height did not change significantly up to background rates of 100kHz/cm2.
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