Results measure absolute gas gain in straw detectors, indicating gas gain variations under specific conditions.
We present results the absolute gas gain measurement of a straw drift-tube detector filled with the binary gaseous mixture ArCO2(10%) at 2 bars gas pressure. The measurement was performed using intensive 1.3 GBq 137Cs-source in order to be able to measure the primary ionization current corresponding to the unity gas gain. The results of gas gain measurement vs. voltage at fixed gas pressure and temperature were fitted and parameterized by Diethorn's formula for further studies of the gas gain variations.
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P. et al. (2011) studied this question.
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