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Proceedings Paper

Novel x-ray imaging diagnostics of high-energy nanosecond pulse accelerators
Author(s): Graham W. Smith; David E. Beutler; John D. Bell; Calvin L. G. Seymour; Robert J. Hohlfelder; Roque R. Gallegos; John Dudley
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Paper Abstract

Pioneering x-ray imaging has been undertaken on a number of AWE’s and Sandia National Laboratories’ radiation effects x-ray simulators. These simulators typically yield a single very short (<50ns) pulse of high-energy (MeV endpoint energy bremsstrahlung) x-ray radiation with doses in the kilorad (krad(Si)) region. X-ray source targets vary in size from 2 to 25cm diameter, dependent upon the particular simulator. Electronic imaging of the source x-ray emission under dynamic conditions yields valuable information upon how the simulator is performing. The resultant images are of interest to the simulator designer who may configure new x-ray source converter targets and diode designs. The images can provide quantitative information about machine performance during radiation effects testing of components under active conditions. The effects testing program is a valuable interface for validation of high performance computer codes and models for the radiation effects community. A novel high-energy x-ray imaging spectrometer is described whereby the spectral energy (0.1 to 2.5MeV) profile may be discerned from the digitally recorded and viewable images via a pinhole/scintillator/CCD imaging system and knowledge of the filtration parameters. Unique images, analysis and a preliminary evaluation of the capability of the spectrometer are presented. Further, a novel time resolved imaging system is described that captures a sequence of high spatial resolution temporal images, with zero interframe time, in the nanosecond timeframe, of our source x-rays.

Paper Details

Date Published: 17 March 2005
PDF: 12 pages
Proc. SPIE 5580, 26th International Congress on High-Speed Photography and Photonics, (17 March 2005); doi: 10.1117/12.565136
Show Author Affiliations
Graham W. Smith, Atomic Weapons Establishment plc (United Kingdom)
David E. Beutler, Sandia National Labs. (United States)
John D. Bell, Atomic Weapons Establishment plc (United Kingdom)
Calvin L. G. Seymour, Atomic Weapons Establishment plc (United Kingdom)
Robert J. Hohlfelder, Sandia National Labs. (United States)
Roque R. Gallegos, Sandia National Labs. (United States)
John Dudley, Atomic Weapons Establishment plc (United Kingdom)


Published in SPIE Proceedings Vol. 5580:
26th International Congress on High-Speed Photography and Photonics
Dennis L. Paisley; Stuart Kleinfelder; Donald R. Snyder; Brian J. Thompson, Editor(s)

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