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Title: Structured photocathodes for improved high-energy x-ray efficiency in streak cameras

Abstract

Here, we have designed and fabricated a structured streak camera photocathode to provide enhanced efficiency for high energy X-rays (1-12 keV). This gold coated photocathode was tested in a Diagnosing Energetic Radiation with streak camera and compared side by side against a conventional flat thin film photocathode. Results show that the measured electron yield enhancement at energies ranging from 1 to 10 keV scales well with predictions, and that the total enhancement can be more than 3x. The spatial resolution of the streak camera does not show degradation in the structured region. We predict that the temporal resolution of the detector will also not be affected as it is currently dominated by the slit width. This demonstration with Au motivates exploration of comparable enhancements with CsI and may revolutionize X-ray streak camera photocathode design.

Authors:
ORCiD logo [1];  [2];  [2];  [3]; ORCiD logo [4];  [3];  [2];  [5];  [1];  [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [3]
  1. National Security Technologies, LLC (NSTec), Livermore, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Nanoshift LLC, Emeryville, CA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1464141
Grant/Contract Number:  
AC02-05CH11231; AC52-06NA25946; DOE/NV/25946–2838
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Related Information: © 2016 Author(s).; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 42 ENGINEERING; spatial resolution; gold; x-ray detectors; image sensors; x-ray imaging; etching; cathodes; photocathodes; cameras; surface structure

Citation Formats

Opachich, Y. P., Bell, P. M., Bradley, D. K., Chen, N., Feng, J., Gopal, A., Hatch, B., Hilsabeck, T. J., Huffman, E., Koch, J. A., Landen, O. L., MacPhee, A. G., Nagel, S. R., and Udin, S. Structured photocathodes for improved high-energy x-ray efficiency in streak cameras. United States: N. p., 2016. Web. doi:10.1063/1.4961302.
Opachich, Y. P., Bell, P. M., Bradley, D. K., Chen, N., Feng, J., Gopal, A., Hatch, B., Hilsabeck, T. J., Huffman, E., Koch, J. A., Landen, O. L., MacPhee, A. G., Nagel, S. R., & Udin, S. Structured photocathodes for improved high-energy x-ray efficiency in streak cameras. United States. doi:10.1063/1.4961302.
Opachich, Y. P., Bell, P. M., Bradley, D. K., Chen, N., Feng, J., Gopal, A., Hatch, B., Hilsabeck, T. J., Huffman, E., Koch, J. A., Landen, O. L., MacPhee, A. G., Nagel, S. R., and Udin, S. Mon . "Structured photocathodes for improved high-energy x-ray efficiency in streak cameras". United States. doi:10.1063/1.4961302. https://www.osti.gov/servlets/purl/1464141.
@article{osti_1464141,
title = {Structured photocathodes for improved high-energy x-ray efficiency in streak cameras},
author = {Opachich, Y. P. and Bell, P. M. and Bradley, D. K. and Chen, N. and Feng, J. and Gopal, A. and Hatch, B. and Hilsabeck, T. J. and Huffman, E. and Koch, J. A. and Landen, O. L. and MacPhee, A. G. and Nagel, S. R. and Udin, S.},
abstractNote = {Here, we have designed and fabricated a structured streak camera photocathode to provide enhanced efficiency for high energy X-rays (1-12 keV). This gold coated photocathode was tested in a Diagnosing Energetic Radiation with streak camera and compared side by side against a conventional flat thin film photocathode. Results show that the measured electron yield enhancement at energies ranging from 1 to 10 keV scales well with predictions, and that the total enhancement can be more than 3x. The spatial resolution of the streak camera does not show degradation in the structured region. We predict that the temporal resolution of the detector will also not be affected as it is currently dominated by the slit width. This demonstration with Au motivates exploration of comparable enhancements with CsI and may revolutionize X-ray streak camera photocathode design.},
doi = {10.1063/1.4961302},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = {2016},
month = {11}
}

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