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Title: Microjet formation and hard x-ray production from a liquid metal target irradiated by intense femtosecond laser pulses

By using a liquid metal as a target one may significantly enhance the yield of hard x-rays with a sequence of two intense femtosecond laser pulses. The influence of the time delay between the two pulses is studied experimentally and interpreted with numerical simulations. It was suggested that the first arbitrary weak pulse produces microjets from the target surface, while the second intense pulse provides an efficient electron heating and acceleration along the jet surface. These energetic electrons are the source of x-ray emission while striking the target surface. The microjet formation is explained based on the results given by both optical diagnostics and hydrodynamic modeling by a collision of shocks originated from two distinct zones of laser energy deposition.
Authors:
; ; ;  [1] ; ; ; ; ;  [2] ;  [3] ; ; ; ; ; ;  [4]
  1. International Laser Center and Faculty of Physics, Lomonosov Moscow State University, Moscow 119991 (Russian Federation)
  2. Centre d'Études Nucléaires de Bordeaux-Gradignan, University of Bordeaux-CNRS-IN2P3, 33170 Gradignan (France)
  3. School of Engineering, University of the West of Scotland, Paisley, Scotland PA1 2BE (United Kingdom)
  4. Centre Lasers Intenses et Applications, University of Bordeaux-CNRS-CEA, Talence 33405 (France)
Publication Date:
OSTI Identifier:
22303652
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 9; 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; COMPUTERIZED SIMULATION; ENERGY ABSORPTION; ENERGY LOSSES; HARD X RADIATION; IRRADIATION; LASERS; LIQUID METALS; PULSES; SURFACES; TAIL ELECTRONS; TIME DELAY