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Title: Direct observation of ultrafast surface transport of laser-driven fast electrons in a solid target

We demonstrate rapid spread of surface ionization on a glass target excited by an intense, ultrashort laser pulse at an intensity of 3 × 10{sup 17} W cm{sup −2}. Time- and space-resolved reflectivity of the target surface indicates that the initial plasma region created by the pump pulse expands at c/7. The measured quasi-static megagauss magnetic field is found to expand in a manner very similar to that of surface ionization. Two-dimensional particle-in-cell simulations reproduce measurements of surface ionization and magnetic fields. Both the experiment and simulation convincingly demonstrate the role of self-induced electric and magnetic fields in confining fast electrons along the target-vacuum interface.
Authors:
; ; ; ; ;  [1] ; ;  [2] ;  [2] ;  [3]
  1. Tata Institute of Fundamental Research, 1 Homi Bhabha Road, Mumbai 400005 (India)
  2. Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, CAS, Beijing 100190 (China)
  3. (MoE), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240 (China)
Publication Date:
OSTI Identifier:
22218399
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 11; Other Information: (c) 2013 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; ELECTRONS; EXCITED STATES; INTERFACES; LASER TARGETS; LASER-PRODUCED PLASMA; LASERS; MAGNETIC FIELDS; PLASMA DIAGNOSTICS; PLASMA PRODUCTION; PLASMA SIMULATION; REFLECTIVITY; SURFACE IONIZATION; SURFACES; TWO-DIMENSIONAL CALCULATIONS