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  • Received: Nov. 21, 2017

    Accepted: Mar. 19, 2018

    Posted: Dec. 27, 2018

    Published Online: Aug. 15, 2018

    The Author Email: P. Bradford (philip.bradford@york.ac.uk)

    DOI: 10.1017/hpl.2018.21

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    P. Bradford, N. C. Woolsey, G. G. Scott, G. Liao, H. Liu, Y. Zhang, B. Zhu, C. Armstrong, S. Astbury, C. Brenner, P. Brummitt, F. Consoli, I. East, R. Gray, D. Haddock, P. Huggard, P. J. R. Jones, E. Montgomery, I. Musgrave, P. Oliveira, D. R. Rusby, C. Spindloe, B. Summers, E. Zemaityte, Z. Zhang, Y. Li, P. McKenna, D. Neely. EMP control and characterization on high-power laser systems[J]. High Power Laser Science and Engineering, 2018, 6(2): 02000e21

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High Power Laser Science and Engineering, Vol. 6, Issue 2, 02000e21 (2018)

EMP control and characterization on high-power laser systems 

P. Bradford1,†,*, N. C. Woolsey1, G. G. Scott2, G. Liao3, H. Liu4,5, Y. Zhang4,5, B. Zhu4,5, C. Armstrong6, S. Astbury2, C. Brenner2, P. Brummitt2, F. Consoli7, I. East2, R. Gray6, D. Haddock2, P. Huggard8, P. J. R. Jones2, E. Montgomery2, I. Musgrave2, P. Oliveira2, D. R. Rusby2, C. Spindloe2, B. Summers2, E. Zemaityte6, Z. Zhang4, Y. Li4,5, P. McKenna6, and D. Neely2,6

Author Affiliations

  • 1Department of Physics, York Plasma Institute, University of York, Heslington, York YO10 5DD, UK
  • 2Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, UK
  • 3Key Laboratory for Laser Plasmas (Ministry of Education) and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
  • 4Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 5School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • 6Department of Physics SUPA, University of Strathclyde, Glasgow G4 0NG, UK
  • 7ENEA - C.R. Frascati - Dipartimento FSN, Via E. Fermi 45, 00044 Frascati, Italy
  • 8Space Science Department, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, UK

Abstract

Giant electromagnetic pulses (EMP) generated during the interaction of high-power lasers with solid targets can seriously degrade electrical measurements and equipment. EMP emission is caused by the acceleration of hot electrons inside the target, which produce radiation across a wide band from DC to terahertz frequencies. Improved understanding and control of EMP is vital as we enter a new era of high repetition rate, high intensity lasers (e.g. the Extreme Light Infrastructure). We present recent data from the VULCAN laser facility that demonstrates how EMP can be readily and effectively reduced. Characterization of the EMP was achieved using B-dot and D-dot probes that took measurements for a range of different target and laser parameters. We demonstrate that target stalk geometry, material composition, geodesic path length and foil surface area can all play a significant role in the reduction of EMP. A combination of electromagnetic wave and 3D particle-in-cell simulations is used to inform our conclusions about the effects of stalk geometry on EMP, providing an opportunity for comparison with existing charge separation models.

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