Abstract
Photosensitive gaseous detectors with a simple photoelectron multiplication mechanism of resistive plate chambers (RPCs) are expected to have both a large photocoverage and an excellent time resolution and to be low-cost. To demonstrate the time resolution of the RPC-based photodetectors, we built a prototype detector with a LaB6 photocathode. It was tested with a picosecond pulse laser and the intrinsic time resolution for single photons was measured to be 25.0±1.1 ps at a gain of 3.3×106.
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