29 May 2013 Study on the detection efficiency of gaseous photomultipliers
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Abstract
Efficient photon detection in gaseous photomultipliers require maximum photoelectron yield from the photocathode surface and also detection of them. In this work we have investigated the parameters that affect the photoelectron yield from the photocathode surface and methods to improve them thus ensuring high detection efficiency of the gaseous photomultiplier. The parameters studied are the electric field at the photocathode surface, surface properties of photocathode and pressure of gas mixture inside the gaseous photomultiplier. It was observed that optimized electric field at the photocathode ensures high detection efficiency. Lower pressure of filled gas increases the photoelectron yield from the photocathode surface but reduces the focusing probability of electrons inside the electron multiplier. Also evacuation for longer duration before gas filling increases the photoelectron yield.
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G. Baishali, G. Baishali, V. Radhakrishna, V. Radhakrishna, V. Koushal, V. Koushal, K. Rakhee, K. Rakhee, K. Rajanna, K. Rajanna, } "Study on the detection efficiency of gaseous photomultipliers", Proc. SPIE 8727, Advanced Photon Counting Techniques VII, 87270U (29 May 2013); doi: 10.1117/12.2015574; https://doi.org/10.1117/12.2015574
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