High Power Laser Science and Engineering, 2019, 7 (2): 02000e24, Published Online: Apr. 30, 2019  

Bremsstrahlung emission from high power laser interactions with constrained targets for industrial radiography Download: 822次

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

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): 02000e24.

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