Capacitively coupled pickup in MCP-based photodetectors using a conductive metallic anode

Angelico, E.; Seiss, T.; Adams, B.; Elagin, A.; Frisch, H.; Spieglan, E.

doi:10.1016/j.nima.2016.12.008

Title: Capacitively coupled pickup in MCP-based photodetectors using a conductive metallic anode

Journal Article · Tue Dec 06 00:00:00 EST 2016 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2016.12.008· OSTI ID:1534161

Angelico, E. ^[1]; Seiss, T. ^[1]; Adams, B. ^[2]; Elagin, A. ^[1]; Frisch, H. ^[1]; Spieglan, E. ^[1]

Univ. of Chicago, IL (United States). Enrico Fermi Inst.
Incom, Inc., Charlton, MA (United States)

We have designed and tested a robust 20×20 cm² thin metal film internal anode capacitively coupled to an external array of signal pads or micro-strips for use in fast microchannel plate photodetectors. The internal anode, in this case a 10 nm-thick NiCr film deposited on a 96% pure Al₂O₃ 3 mm-thick ceramic plate and connected to HV ground, provides the return path for the electron cascade charge. The multi-channel pickup array consists of a printed-circuit card or glass plate with metal signal pickups on one side and the signal ground plane on the other. The pickup can be put in close proximity to the bottom outer surface of the sealed photodetector, with no electrical connections through the photodetector hermetic vacuum package other than a single ground connection to the internal anode. Two pickup patterns were tested using a small commercial MCP-PMT as the signal source: 1) parallel 50 Ω 25-cm-long micro-strips with an analog bandwidth of 1.5 GHz, and 2) a 20×20 cm² array of 2-dimensional square ‘pads’ with sides of 1.27 cm or 2.54 cm. The rise-time of the fast input pulse is maintained for both pickup patterns. For the pad pattern, we observe 80% of the directly coupled amplitude. For the strip pattern we measure 34% of the directly coupled amplitude on the central strip of a broadened signal. The physical decoupling of the photodetector from the pickup pattern allows easy customization for different applications while maintaining high analog bandwidth.

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Research Organization:: Univ. of Chicago, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0008172; SC-0008172

OSTI ID:: 1534161

Alternate ID(s):: OSTI ID: 1411301

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 846; ISSN 0168-9002

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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References (17)

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Title: Capacitively coupled pickup in MCP-based photodetectors using a conductive metallic anode

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