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Title: Evidence of locally enhanced target heating due to instabilities of counter-streaming fast electron beams

The high-current fast electron beams generated in high-intensity laser-solid interactions require the onset of a balancing return current in order to propagate in the target material. Such a system of counter-streaming electron currents is unstable to a variety of instabilities such as the current-filamentation instability and the two-stream instability. An experimental study aimed at investigating the role of instabilities in a system of symmetrical counter-propagating fast electron beams is presented here for the first time. The fast electron beams are generated by double-sided laser-irradiation of a layered target foil at laser intensities above 10{sup 19‚ÄČ}W/cm{sup 2}. High-resolution X-ray spectroscopy of the emission from the central Ti layer shows that locally enhanced energy deposition is indeed achieved in the case of counter-propagating fast electron beams.
Authors:
;  [1] ; ;  [2] ;  [3] ;  [4] ; ; ; ;  [5] ; ;  [1] ;  [6] ;  [1] ;  [6] ; ;  [7] ; ;  [8]
  1. Intense Laser Irradiation Laboratory at INO, CNR, Pisa (Italy)
  2. Physics Department, University of York, York (United Kingdom)
  3. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
  4. Imperial College London, London (United Kingdom)
  5. Physics Department, University of Oxford, Oxford (United Kingdom)
  6. (Italy)
  7. Physics Department, Queens University Belfast, Belfast (United Kingdom)
  8. Rutherford Appleton Laboratory, STFC, Didcot (United Kingdom)
Publication Date:
OSTI Identifier:
22408040
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 2; Other Information: (c) 2015 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; CURRENTS; ELECTRON BEAMS; ENERGY ABSORPTION; ENERGY LOSSES; INTERACTIONS; LASER RADIATION; LASER TARGETS; SOLIDS; TWO-STREAM INSTABILITY; X-RAY SPECTROSCOPY