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Title: Dependence of optimal initial density on laser parameters for multi-keV x-ray radiators generated by nanosecond laser-produced underdense plasma

Efficient multi-keV x-ray sources can be produced using nanosecond laser pulse-heated middle-Z underdense plasmas generated using gas or foam. Previous experimental results show that an optimal initial target density exists for efficient multi-keV x-ray emission at which the laser ionization wave is supersonic. Here we explore the influence of the laser intensity and the pulse duration on this optimal initial target density via a one-dimensional radiation hydrodynamic simulation. The simulation shows that the optimal initial density is sensitive to both the laser intensity and the pulse duration. However, the speed of the supersonic ionization wave at the end of the laser irradiation is always maintained at 1.5 to 1.7 times that of the ion acoustic wave under the optimal initial density conditions.
Authors:
 [1] ;  [2] ; ; ; ;  [1] ; ; ;  [3]
  1. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, Sichuan 621900 (China)
  2. (China)
  3. Department of Modern Physics and CAS Key Laboratory of Geospace Environment, University of Science and Technology of China, Hefei, Anhui 230026 (China)
Publication Date:
OSTI Identifier:
22493836
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 23; Journal Issue: 1; Other Information: (c) 2016 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; FOAMS; HYDRODYNAMIC MODEL; ION ACOUSTIC WAVES; IONIZATION; KEV RANGE; LASER RADIATION; LASER-PRODUCED PLASMA; ONE-DIMENSIONAL CALCULATIONS; PHOTON EMISSION; PLASMA DENSITY; PULSES; RADIATORS; X RADIATION; X-RAY SOURCES