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Title: Spectroscopic characterization and imaging of laser- and unipolar arc-induced plasmas

Tungsten plasmas induced by unipolar arcs were investigated using optical emission spectroscopy and imaging, and compared with laser-induced tungsten plasmas. The unipolar arcs were initiated in the linear-plasma simulator PISCES-A at UCSD under fusion relevant conditions. The electron temperature and density of the unipolar arc plasmas were in the range 0.5–0.7 eV and 0.7–2.0 × 10{sup 20 }m{sup −3}, respectively, and increased with increasing negative bias voltage, but did not correlate with the surface temperature. In comparison, the electron temperature and density of the laser-induced plasmas were in the range 0.6–1.4 eV and 7 × 10{sup 19}–1 × 10{sup 22 }m{sup −3}, respectively.
Authors:
 [1] ; ; ;  [2] ;  [3]
  1. FOM Institute DIFFER—Dutch Institute for Fundamental Energy Research, Nieuwegein, NL-3430 BE (Netherlands)
  2. Center for Energy Research, University of California at San Diego, 9500 Gilman Drive, La Jolla, California 92093-0417 (United States)
  3. Science and Technology of Nuclear Fusion, Eindhoven University of Technology, Eindhoven 5612 AZ (Netherlands)
Publication Date:
OSTI Identifier:
22314589
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 6; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COMPARATIVE EVALUATIONS; ELECTRIC POTENTIAL; ELECTRON TEMPERATURE; EMISSION SPECTROSCOPY; EV RANGE; LASERS; PLASMA; SIMULATORS; SURFACES; TUNGSTEN