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arXiv · 2007.07973

Segmented Anodes with Sub-millimeter Spatial Resolution for MCP-Based Photodetectors

Jinseo Park·Fangjian Wu·Evan Angelico·Henry J. Frisch·Eric Spieglan
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Abstract

Micro-channel-plate-based photo-detectors are unique in being capable of covering areas of many square-meters while providing sub-millimeter space resolution, time resolutions of less than 10 picoseconds for charged particles, time resolutions of 30-50 psec for single photons. Incorporating a capacitively-coupled anode allows for the use of external pickup electrodes optimized for occupancy, rate, and time/space resolution. The signal pickup antenna can be implemented as a printed circuit card with a pattern chosen to match the specific application needs. The electrode elements are typically either a 2-dimensional array of pads for high-occupancy/high-rate applications, or a 1-dimensional array of strips for low-occupancy/low-rate, and a lower channel count. Here we present pad patterns that enhance charge-sharing between pads to significantly lower the required channel count/area while maintaining spatial resolutions of 100 to 200 microns for charged particles and 400 microns to 1 mm for single photons. Patterns that use multiple signal layers in the capacitively-coupled printed circuit signal pickup board can lower the channel count even further, moving the scaling behavior in the number of pads versus total area from quadratic to linear.

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Jinseo Park, Fangjian Wu, Evan Angelico, Henry J. Frisch, Eric Spieglan. 2020-07-15. Segmented Anodes with Sub-millimeter Spatial Resolution for MCP-Based Photodetectors. https://doi.org/10.1016/j.nima.2020.164702

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