A microchannel-plate photomultiplier (MCP-PMT) has been applied to the time-correlated single-photon counting technique. Electrical and timing characteristics were investigated for the two types of MCP-PMT’s, nonproximity type (Hamamatsu R1264) and proximity type (R1564), which are different in distance between the photocathode and MCP. In the proximity type, the transit-time spread was found to be 60 ps, i.e., a factor of 4 shorter than that in conventional photomultipliers with a dynode string. It was concluded that both types of MCP-PMT’s are fully applicable to the single-photon counting method and that the proximity type MCP-PMT in particular leads to further improvements in the cathode transit-time difference and the wavelength effect of the timing properties. Some examples of experimental results are shown for fluorescence decay curves and picosecond time-resolved spectra.
Micro-channel plate multipliers have been used to detect the passage of relatlvistlc charged particles. Measurements of the detection efficiency and pulse height response vers.is micro-channel plat* gain are presented for one, two and three micro-channel plate arrays. Values describing temporal response and transit time jitter are also given. In a aaparate measurement, the response of a single micro-channel plate to Individual slow electrons ("< 1 keV) was studied. By using a special technique output bunches as small as three electrons may be seen for low average micro-channel plate gain. The results of attempts to improve the micro-channel plate response are also presented.
The characteristics and performance of several kinds of high-gain micro-channel plate photomultipliers have been Investigated. Special attention was directed towards 1) lifetime studies, 11) performance In the magnetic field, and 111) timing properties. Lifetime studies include separata investigations of the photocathode quantum efficiency degradation caused by Ion feedback, and the deterioration of the micro-channel plate gain. The dependence of the micro-channel place photonultiplier gain on the Intensity and the direction of the magnetic field (up to 7 leGauss) is reported.
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