Investigation of quantum efficiencies in multilayered photocathodes for microchannel plate applications

Journal Article · Fri Jan 01 04:00:00 EST 1999 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1149343· OSTI ID:295642

Ze, F; Landen, O L; Bell, P M; Turner, R E; Tutt, T; Alvarez, S S; Costa, R L ^[1]

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1. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

Microchannel plates (MCPs) are used in many diagnostic systems to study laser-plasma interactions. Typically the front surface of a MCP is coated with some photocathode (PC) material to convert x ray to electron. This is followed by electron multiplication along the microchannels. Materials such as CsI, Al, and Au have been identified as good PC materials, but the overall quantum efficiencies of these materials are low, so that electron multiplication along the channel has been the only path to signal amplification. This approach is known to have some problems (J. D. Wiedwald, University of California UCRL-JC-110906, August 1992). We investigated the effect of pairing transmission PC to standard MC{close_quote}s and found that CsI and Au foils used in multilayered configuration, significantly enhance the overall quantum efficiency of the combination. The findings could lead to better MCP design and fabrication.

• OSTI ID: 295642
• Report Number(s): CONF-980605--
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 1 Vol. 70; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALUMINIUM
BEAM-PLASMA SYSTEMS
CESIUM
GOLD
LASER RADIATION
LASER-PRODUCED PLASMA
MATERIALS
MICROCHANNEL ELECTRON MULTIPLIERS
PHOTOCATHODES
PLASMA DIAGNOSTICS
QUANTUM EFFICIENCY