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  • Received: Sep. 5, 2018

    Accepted: Jan. 30, 2019

    Posted: Apr. 30, 2019

    Published Online: Apr. 30, 2019

    The Author Email: C. D. Armstrong (chris.armstrong@stfc.ac.uk)

    DOI: 10.1017/hpl.2019.8

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    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. Bremsstrahlung emission from high power laser interactions with constrained targets for industrial radiography[J]. High Power Laser Science and Engineering, 2019, 7(2): e24

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High Power Laser Science and Engineering, Vol. 7, Issue 2, e24 (2019)

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

C. D. Armstrong1,2,†,*, C. M. Brenner2, C. Jones3, D. R. Rusby2, Z. E. Davidson1, Y. Zhang2,4, J. Wragg2, S. Richards2, C. Spindloe2, P. Oliveira2, M. Notley2, R. Clarke2, S. R. Mirfayzi5, S. Kar5, Y. Li4, T. Scott3, P. McKenna1, and D. Neely2

Author Affiliations

  • 1Department of Physics SUPA, University of Strathclyde, Glasgow G4 0NG, UK
  • 2Central Laser Facility, STFC Rutherford Appleton Laboratory, Harwell, Oxford OX11 0QX, UK
  • 3Interface Analysis Centre, HH Wills Physics Laboratory, Tyndall Avenue, Bristol BS8 1TL, UK
  • 4Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 5Centre for Plasma Physics, Queen’s University Belfast, Belfast BT7 1NN, UK

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 $(20\pm 3)~\unicode[STIX]{x03BC}\text{m}$ 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.

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