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Title: Tungsten Spectroscopy for Fusion Plasmas

Tungsten is one of very few candidate materials for plasma facing components in future fusion devices. Therefore, investigations have been started at fusion devices and EBITs to provide atomic data for W in fusion plasmas. Usually the influx of impurities is deduced from the intensity of spectral lines from neutrals or ions in a low ionisation state. For this purpose the appropriate ionisation rates and excitation rates have to be known. At the moment, a WI transition (7S-7P) at 400.9 nm is used, but an extension of the method to other lines is under investigation. In the core of present day plasmas ionisation states up to W56+ can be reached and in a reactor states up to around W68+ will be present. In order to extract information on the local W concentrations over the whole plasma radius atomic data (wavelength, excitation, ionisation, recombination) for all the charge states up to the maximum ionisation state are necessary. Similarly, a high sensitivity has to be achieved since the central W concentrations should stay below 10-4. For an unambiguous identification of the transitions EBIT measurements are of great advantage, but due to the lower electron density compared to fusion plasmas, investigations there aremore » indispensable.« less
Authors:
; ;  [1] ; ;  [2]
  1. Max-Planck-Institut fuer Plasmaphysik, Euratom Association, Boltzmannstr.2, 85748 Garching (Germany)
  2. Institut fuer Plasmaphysik, Euratom Association, Forschungszentrum Juelich GmbH, 52425 Juelich (Germany)
Publication Date:
OSTI Identifier:
21056931
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 901; Journal Issue: 1; Conference: ICAMDATA: 5. international conference on atomic and molecular data and their applications, Meudon (France), 15-19 Oct 2006; Other Information: DOI: 10.1063/1.2727359; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA). ASDEX Upgrade Team; TEXTOR Team
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CHARGE STATES; ELECTRON DENSITY; EMISSION SPECTROSCOPY; EXCITATION; FIRST WALL; IONIZATION; MULTICHARGED IONS; PLASMA; PLASMA CONFINEMENT; PLASMA DIAGNOSTICS; PLASMA IMPURITIES; RECOMBINATION; SENSITIVITY; THERMONUCLEAR DEVICES; TUNGSTEN; TUNGSTEN IONS; WAVELENGTHS