High Quantum Efficiency Opaque CsI Photocathodes for the Extreme and Far Ultraviolet

Siegmund, Oswald H. W.; Everman, E.; Vallerga, J.; Labov, S. E.; Bixler, J.; Lampton, M.

doi:10.1117/12.936550

Cited by 13 publications

(3 citation statements)

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“…21) the incoming radiation interacts with the MCP glass, the electrode coating (inconel, NiCr, etc) or the cathode material used to act as a converter. Photoelectrons are produced provided the photon energy exceeds the material band gap and electron affinity 5 . The photoelectrons are emitted into the MCP pores to generate electron avalanches inside the pores, or emitted away from the MCP "web" for events on the MCP front surface.…”

Section: Mcp Quantum Detection Efficiencymentioning

confidence: 99%

“…The first stage of these detectors is the conversion of incoming photons to electrons, followed by signal amplification in the MCP(s). Often MCPs are coated with an "opaque" photocathode material to enhance the conversion efficiency (quantum detection efficiency -QDE) [1][2][3][4][5] . The efficiency of this photocathode material is not only dependent on the material chosen, it is also dependent on the efficiency of the microchannel plates to detect the emitted photoelectrons.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Microchannel plates: recent advances in performance

Siegmund

Vallerga

Tremsin

et al. 2007

UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XV

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Microchannel plates have, because of their adaptability to various size and configuration formats, allowed a wide range of devices to be realized in astronomical applications for X-ray, UV and visible sensing, employing many different forms of readout techniques and photocathode types. Two essential performance issues are the quantum detection efficiency, and the uniformity of response over the detector field of view. In both of these areas microchannel plates have had issues, both in the consistency of high quantum detection efficiency, and in fixed pattern noise introduced by fabrication processes for microchannel plates. We show that recent work has improved the consistency of obtaining high quantum detection efficiency, and has virtually eliminated the causes of fixed pattern noise due to fabrication issues.

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Section: Mcp Quantum Detection Efficiencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microchannel plates: recent advances in performance

Siegmund

Vallerga

Tremsin

et al. 2007

UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XV

View full text Add to dashboard Cite

show abstract

“…Incoming radiation interacts with the MCP glass, the electrode coating (inconel, NiCr, etc) or the cathode material used to act as a converter. Photoelectrons are produced provided the photon energy exceeds the material band gap and electron affinity 5 . These can be emitted into the MCP pores to generate electron avalanches inside the pores, or emitted away from the MCP "web" for events on the MCP front surface.…”

Section: Introductionmentioning

confidence: 99%

Characterizations of microchannel plate quantum efficiency

2005

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Microchannel plates have been used over many years in astronomical applications for X-ray, UV and visible sensing. Their adaptability to various size and configuration formats have allowed a wide range of devices to be realized, employing many different forms of readout techniques and photocathode types. One problem that has arisen for a number of these programs is the issue of obtaining high quantum efficiency on a consistent basis. Several missions have suffered from problems when microchannel plates have not achieved the quantum efficiency values that are the generally accepted normal values. We have compiled an extensive set of quantum efficiency measurements which cover missions and devices produced over the past 20 years. These show that the deficiencies in MCP QE of bare MCP's also result in a corresponding decrease in QE for same MCP's coated with a photocathode. This may be interpreted as a deficiency of the MCP detection efficiency for low energy photoelectrons produced by the MCP/cathode. Recent measurements of MCP's produced by alteration of the processing procedures shows that this problem is avoidable, and gives excellent results for current generation MCP's with 5-6 micron pore sizes.

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Spectroscopic Techniques: Ultraviolet

Stark¹,

Smith²

2006

Springer Handbooks

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High Quantum Efficiency Opaque CsI Photocathodes for the Extreme and Far Ultraviolet

Cited by 13 publications

References 0 publications

Microchannel plates: recent advances in performance

Microchannel plates: recent advances in performance

Characterizations of microchannel plate quantum efficiency

Spectroscopic Techniques: Ultraviolet

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