Time-resolved measurements of fast electron recirculation for relativistically intense femtosecond scale laser-plasma interactions

J. S. Green, N. Booth, R. J. Dance, R. J. Gray, D. A. MacLellan, A. Marshall, P. McKenna, C. D. Murphy, C. P. Ridgers, A. P. L. Robinson, D. Rusby, R. H. H. Scott, L. Wilson

Research output: Contribution to journalArticle

Abstract

A key issue in realising the development of a number of applications of high-intensity lasers is the dynamics of the fast electrons produced and how to diagnose them. We report on measurements of fast electron transport in aluminium targets in the ultra-intense, short-pulse (<50 fs) regime using a high resolution temporally and spatially resolved optical probe. The measurements show a rapidly (≈0.5c) expanding region of Ohmic heating at the rear of the target, driven by lateral transport of the fast electron population inside the target. Simulations demonstrate that a broad angular distribution of fast electrons on the order of 60° is required, in conjunction with extensive recirculation of the electron population, in order to drive such lateral transport. These results provide fundamental new insight into fast electron dynamics driven by ultra-short laser pulses, which is an important regime for the development of laser-based radiation and particle sources.

LanguageEnglish
Article number4525
Number of pages16
JournalScientific Reports
Volume8
Issue number1
DOIs
Publication statusPublished - 14 Mar 2019

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laser plasma interactions
time measurement
electrons
pulses
radiation sources
high power lasers
lasers
angular distribution
aluminum
heating
probes
high resolution
simulation

Keywords

  • lasers
  • electrons
  • aluminium
  • plasma physics
  • laser-plasma interactions

Cite this

Green, J. S. ; Booth, N. ; Dance, R. J. ; Gray, R. J. ; MacLellan, D. A. ; Marshall, A. ; McKenna, P. ; Murphy, C. D. ; Ridgers, C. P. ; Robinson, A. P. L. ; Rusby, D. ; Scott, R. H. H. ; Wilson, L. / Time-resolved measurements of fast electron recirculation for relativistically intense femtosecond scale laser-plasma interactions. In: Scientific Reports. 2019 ; Vol. 8, No. 1.
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abstract = "A key issue in realising the development of a number of applications of high-intensity lasers is the dynamics of the fast electrons produced and how to diagnose them. We report on measurements of fast electron transport in aluminium targets in the ultra-intense, short-pulse (<50 fs) regime using a high resolution temporally and spatially resolved optical probe. The measurements show a rapidly (≈0.5c) expanding region of Ohmic heating at the rear of the target, driven by lateral transport of the fast electron population inside the target. Simulations demonstrate that a broad angular distribution of fast electrons on the order of 60° is required, in conjunction with extensive recirculation of the electron population, in order to drive such lateral transport. These results provide fundamental new insight into fast electron dynamics driven by ultra-short laser pulses, which is an important regime for the development of laser-based radiation and particle sources.",
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Green, JS, Booth, N, Dance, RJ, Gray, RJ, MacLellan, DA, Marshall, A, McKenna, P, Murphy, CD, Ridgers, CP, Robinson, APL, Rusby, D, Scott, RHH & Wilson, L 2019, 'Time-resolved measurements of fast electron recirculation for relativistically intense femtosecond scale laser-plasma interactions' Scientific Reports, vol. 8, no. 1, 4525. https://doi.org/10.1038/s41598-018-22422-6

Time-resolved measurements of fast electron recirculation for relativistically intense femtosecond scale laser-plasma interactions. / Green, J. S.; Booth, N.; Dance, R. J.; Gray, R. J.; MacLellan, D. A.; Marshall, A.; McKenna, P.; Murphy, C. D.; Ridgers, C. P.; Robinson, A. P. L.; Rusby, D.; Scott, R. H. H.; Wilson, L.

In: Scientific Reports, Vol. 8, No. 1, 4525, 14.03.2019.

Research output: Contribution to journalArticle

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AU - Green, J. S.

AU - Booth, N.

AU - Dance, R. J.

AU - Gray, R. J.

AU - MacLellan, D. A.

AU - Marshall, A.

AU - McKenna, P.

AU - Murphy, C. D.

AU - Ridgers, C. P.

AU - Robinson, A. P. L.

AU - Rusby, D.

AU - Scott, R. H. H.

AU - Wilson, L.

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AB - A key issue in realising the development of a number of applications of high-intensity lasers is the dynamics of the fast electrons produced and how to diagnose them. We report on measurements of fast electron transport in aluminium targets in the ultra-intense, short-pulse (<50 fs) regime using a high resolution temporally and spatially resolved optical probe. The measurements show a rapidly (≈0.5c) expanding region of Ohmic heating at the rear of the target, driven by lateral transport of the fast electron population inside the target. Simulations demonstrate that a broad angular distribution of fast electrons on the order of 60° is required, in conjunction with extensive recirculation of the electron population, in order to drive such lateral transport. These results provide fundamental new insight into fast electron dynamics driven by ultra-short laser pulses, which is an important regime for the development of laser-based radiation and particle sources.

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KW - plasma physics

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