Collimation of energetic electrons from a laser-target interaction by a magnetized target back plasma preformed by a long-pulse laser

H. B. Zhuo, Z. L. Chen, Z. M. Sheng, M. Chen, T. Yabuuchi, M. Tampo, M. Y. Yu, X. H. Yang, C. T. Zhou, K. A. Tanaka, J. Zhang, R. Kodama

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It is demonstrated experimentally and by numerical simulations that the presence of a long-pulse-laser-created back plasma on the target backside can focus the relativistic electrons produced by short-pulse laser interaction with the front of a solid target. Comparing this to that without the back plasma, the number density of the fast electrons is increased by one order of magnitude, and their divergence angle is reduced fivefold. The effect is attributed to the absence of the backside sheath electric field and the collimation effect of the megagauss self-generated baroclinic magnetic field there. Such an acceleration scheme can be useful to applications requiring high-energy and charge-density electron bunches, such as fast ignition in inertial fusion.

Original languageEnglish
Article number215003
Number of pages5
JournalPhysical Review Letters
Issue number21
Publication statusPublished - 29 May 2014


  • numerical simulations
  • back plasma
  • fast electrons
  • inertial fusion

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