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Title: Target normal sheath acceleration of foil ions by laser-trapped hot electrons from a long subcritical-density preplasma

In a long subcritical density plasma, an ultrashort ultraintense laser pulse can self-organize into a fast but sub-relativistic propagating structure consisting of the modulated laser light and a large number of trapped electrons from the plasma. Upon impact of the structure with a solid foil target placed in the latter, the remaining laser light is reflected, but the dense and hot trapped electrons pass through the foil, together with the impact-generated target-frontsurface electrons to form a dense hot electron cloud at the back of the target suitable for enhancing target normal sheath acceleration of the target-backsurface ions. The accelerated ions are well collimated and of high charge and energy densities, with peak energies a full order of magnitude higher than that from target normal sheath acceleration without the subcritical density plasma. In the latter case, the space-charge field accelerating the ions is limited since they are formed only by the target-frontsurface electrons during the very short instant of laser reflection.
Authors:
; ; ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [1] ;  [7]
  1. Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Science, Shanghai 201800 (China)
  2. Institute of Fusion Theory and Simulation and Department of Physics, Zhejiang University, Hangzhou 310027 (China)
  3. (Germany)
  4. College of Science, National University of Defense Technology, Changsha 410073 (China)
  5. National Laboratory for Parallel and Distributed Processing, School of Computer Science, National University of Defense Technology, Changsha 410073 (China)
  6. Department of Physics, University of California, Los Angeles, California 90095 (United States)
  7. (Japan)
Publication Date:
OSTI Identifier:
22407933
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATION; ENERGY DENSITY; IONS; LASER RADIATION; LASER TARGETS; PLASMA DENSITY; PLASMA SHEATH; PULSES; REFLECTION; SPACE CHARGE; TRAPPED ELECTRONS; VISIBLE RADIATION