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首页> 外文期刊>review of scientific instruments >Highhyphen;resolution imaging with a twohyphen;dimensional resistive anode photon counter
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Highhyphen;resolution imaging with a twohyphen;dimensional resistive anode photon counter

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We describe a method for achieving high spatial resolution readout of individual photoelectron events using microchannel plates and a resistive anode. Specifically, we employ a clamped pair of microchannel plates (rsquo;rsquo;Vgeometryrsquo;rsquo;) followed by a gap and a clamped triplet of microchannel plates (rsquo;rsquo;Zgeometryrsquo;rsquo;) in cascade, in order to achieve a high (3times;107) stable electron gain. This high gain in turn allows the position determination of each photoelectron event with a very high signalhyphen;tohyphen;noise ratio, thereby giving a theoretical spatial resolution limited chiefly by the microchannel plate channel spacing rather than by the anode signalhyphen;tohyphen;noise ratio. Our first model of this detector is a windowless vacuumhyphen;ultraviolet image sensor, and demonstrates 500times;500 pixel images (50 mgr;m FWHM over a 25hyphen;mm circular field of view). Our spatial resolution is presently limited by the microchannel structure and by the error distribution in our analog pulse ratio electronics. Highhyphen;current microchannel plates are employed to avoid serious gain variations with respect to changing count rate. Although our present detector hardware is a demountable assembly for laboratory experimentation, the mount design is compatible with planar, remotelyhyphen;processed, proximityhyphen;focused photocathodes, and will shortly be evaluated as a sealed detector for echelle spectroscopy at visible wavelengths.

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