High resolution decoding of Multi-Anode Microchannel Array detectors

Details High resolution decoding of Multi-Anode Microchannel Array detectors High resolution decoding of Multi-Anode Microchannel Array detectors

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991spie.1549...52k&link_type=abstract

In: EUV, X-ray, and gamma-ray instrumentation for astronomy II; Proceedings of the Meeting, San Diego, CA, July 24-26, 1991 (A93

Astronomy and Astrophysics

Astronomy

9

Cmos, Decoding, Integrated Circuits, Microchannel Plates, Multi-Anode Microchannel Arrays, Radiation Counters, High Resolution, Photocathodes, Pixels, Spatial Resolution

Scientific paper

The Multi-Anode Microchannel Array (MAMA) is a photon counting detector which utilizes a photocathode for photon to electron conversion, a microchannel plate (MCP) for signal amplification and a proximity focused anode array for position sensitivity. The detector electronics decode the position of an event through coincidence discrimination. The decoding algorithm which associates a given event with the appropriate pixel is determined by the geometry of the array. A new algorithm incorporated into a CMOS Application Specific Integrated Circuit (ASIC) decoder which improves the pixel spatial resolution is described. The new algorithm does not degrade the detector throughput and does not require any modifications to the detector tube. The standard MAMA detector has a pixel size of 25 x 25 square microns, but with the new decoder circuit the pixel size is reduced to 12.5 x 12.5 square microns. We have built the first set of decode electronics utilizing the new ASIC chips and report here on the first imaging tests of this system.

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