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Title: Photocathode

A photocathode designs that leverage the grazing incidence geometry yield improvements through the introduction of recessed structures, such as cones, pyramids, pillars or cavities to the photocathode substrate surface. Improvements in yield of up to 20 times have been shown to occur in grazing incidence geometry disclosed herein due to a larger path length of the X-ray photons which better matches the secondary electron escape depth within the photocathode material. A photocathode includes a substrate having a first side and a second side, the first side configured to receive x-ray energy and the second side opposing the first side. A structured surface is associated with the second side of the substrate such that the structured surface includes a plurality of recesses from the second side of the substrate into the substrate.
Inventors:
;
Issue Date:
OSTI Identifier:
1411395
Assignee:
National Security Technologies, LLC (North Las Vegas, NV) NSTEC
Patent Number(s):
9,837,238
Application Number:
15/249,197
Contract Number:
AC52-06NA25946
Resource Relation:
Patent File Date: 2016 Aug 26
Research Org:
Nevada Test Site (NTS), Mercury, NV (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 47 OTHER INSTRUMENTATION

Other works cited in this record:

Methods Of Producing Field Ionizer And Field Emission Cathode Structures
patent, May 1974

X-Ray Image Intensifier Input
patent, September 1974

Solid-state port digital imager
patent, August 1992

X-ray imaging detector with a gaseous electron multiplier
patent, March 1993

Ultrasonic transducer with integrated variable gain amplifier
patent, May 1994

X-ray image intensifier tube having a photocathode and a scintillator screen positioned on a microchannel array
patent, June 1994

Emissive display including field emitters on a transparent substrate
patent, July 1997

360 degrees surround photon detector/electron multiplier with cylindrical photocathode defining an internal detection chamber
patent, August 1997

Advanced semiconductor emitter technology photocathodes
patent, September 1998

Corner cube enhanced photocathode
patent, November 2013

X-Ray Interactions: Photoabsorption, Scattering, Transmission, and Reflection at E = 50-30,000 eV, Z = 1-92
journal, July 1993
  • Henke, B. L.; Gullikson, E. M.; Davis, J. C.
  • Atomic Data and Nuclear Data Tables, Vol. 54, Issue 2, p. 181-342
  • DOI: 10.1006/adnd.1993.1013

High energy photocathodes for laser fusion diagnostics
journal, October 2010
  • Halvorson, C.; Houck, T.; Macphee, A.
  • Review of Scientific Instruments, Vol. 81, Issue 10, Article No. 10E309
  • DOI: 10.1063/1.3494384

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