Bremsstrahlung emission from high power laser interactions with constrained targets for industrial radiography

C. D. Armstrong, C. M. Brenner, C. Jones, D. R. Rusby, Z. E. Davidson, Y. Zhang, J. Wragg, S. Richards, C. Spindloe, P. Oliveira, M. Notley, R. Clarke, S. R. Mirfayzi, S. Kar, Y. Li, T Scott, P. McKenna, D. Neely

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Abstract

Laser-solid interactions are highly suited as a potential source of high energy X-rays for nondestructive imaging. A bright, energetic X-ray pulse can be driven from a small source, making it ideal for high resolution X-ray radiography. By limiting the lateral dimensions of the target we are able to confine the region over which X-rays are produced, enabling imaging with enhanced resolution and contrast. Using constrained targets we demonstrate experimentally a X-ray source, improving the image quality compared to unconstrained foil targets. Modelling demonstrates that a larger sheath field envelope around the perimeter of the constrained targets increases the proportion of electron current that recirculates through the target, driving a brighter source of X-rays.

Original languageEnglish
Article numbere24
Number of pages7
JournalHigh Power Laser Science and Engineering
Volume7
Early online date25 Apr 2019
DOIs
Publication statusE-pub ahead of print - 25 Apr 2019

Keywords

  • Bremsstrahlung
  • non-destructive imaging
  • radiography
  • x-ray
  • high powered laser

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