Reproducible, rugged, and inexpensive photocathode x-ray diode

The photoemissive cathode type of x-ray diode (XRD) is popular for measuring time and spectrally resolved output of pulsed power experiments. Vitreous carbon XRDs currently used on the Sandia National Laboratories Z-machine were designed in the early 1980s and use materials and processes no longer a...

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Bibliographic Details
Published in:Review of scientific instruments 2008-10, Vol.79 (10), p.10E922-10E922-3
Main Authors: Idzorek, G. C., Tierney, T. E., Lockard, T. E., Moy, K. J., Keister, J. W.
Format: Article
Language:English
Subjects:
BNL
CALIBRATION
CARBON
COMPARATIVE EVALUATIONS
DESIGN
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
NSLS
PHOTOCATHODES
PHOTODIODES
SANDIA NATIONAL LABORATORIES
SCANNING ELECTRON MICROSCOPY
X RADIATION
X-RAY DIFFRACTION
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Summary:The photoemissive cathode type of x-ray diode (XRD) is popular for measuring time and spectrally resolved output of pulsed power experiments. Vitreous carbon XRDs currently used on the Sandia National Laboratories Z-machine were designed in the early 1980s and use materials and processes no longer available. Additionally cathodes used in the high x-ray flux and dirty vacuum environment of a machine such as Z suffer from response changes requiring recalibration. In searching for a suitable replacement cathode, we discovered very high purity vitreous-carbon planchets are commercially available for use as biological substrates in scanning electron microscope (SEM) work. After simplifying the photocathode mounting to use commercially available components, we constructed a set of 20 XRDs using SEM planchets that were then calibrated at the National Synchrotron Light Source at Brookhaven National Laboratory. We present comparisons of the reproducibility and absolute calibrations between the current vitreous-carbon XRDs and our new design.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.2969279