Improved microchannel plate performance with a resistive anode encoder

Abstract

Performance of microchannel plates in the high-gain chevron configuration has been improved by the addition of an interplate voltage VB. For VB=100 V, and positive ion excitation, the output electron distribution FWHM decreased from 166% to 97%. Using a resistive anode encoder (RAE) readout, and 1216-Å uv excitation, we observed a corresponding spatial resolution improvement of 16%.

Residual gas beam profile monitor

“…The gap between the two MCPs is 0.25 mm and has an accelerating potential of about 1 V. The gap between the output of the MCPs and the anode strips is 1.5 mm and has an accelerating potential in the range of 125-250 V. Calculations show that these gaps add 0.4 mm rms to the profile width measurements [10] .…”

Hard x-ray detector based on microchannel plates

“…This type of pulse height behavior indicates that there is a significant number of signals below the lowest threshold that do not register a large enough charge to be counted. In works [11][12][13] where the pulse height distribution of Chevrons is quasi-Gaussian in shape, ions, electrons, and soft x rays were detected. In these detectors electron avalanches were generated in the input of convertor channels.…”

“…The number of amplifier channels excited by a convertor electron avalanche was estimated in other works. [12][13][14] In our detector the electron avalanche generated in the convertor channel excited about 100 amplifier channels. Since a 2ϫ35 mm strip of amplifier plate contains about 300 000 channels and the dead time of a channel is 40 ms, the dynamic range of this detector is theoretically limited to 300 000 and 100 000 quanta/s for 662 and 122 keV in a beam of 2ϫ2 mm cross section.…”

High speed imaging using a capacitive division technique

“…The performance of these devices is fundamentally limited by a trade-off between spatial resolution and event rate caused by the competing characteristics of signal-to-noise ratio and pulse processing time, and dominated by Johnson noise in the case of RA [3], and input capacitance on the preamplifier [4] in the case of the WSA. Devices such as the Vernier anode [5] and cross-strip anode [6] have sought to overcome these limitations, but at the expense of higher complexity.…”