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Determination of tungsten and molybdenum concentrations from an x-ray range spectrum in JET with the ITER-like wall configuration

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Published copy (DOI)

Author(s)

  • T. Nakano
  • A. E. Shumack
  • C. F. Maggi
  • K. D. Lawson
  • I. Coffey
  • T. Pütterich
  • S. Brezinsek
  • G. F. Matthews
  • M. Chernyshova
  • K. Jakubowska
  • M. Scholz
  • J. Rzadkiewicz
  • T. Czarski
  • W. Dominik
  • G. Kasprowicz
  • K. Pozniak
  • W. Zabolotny
  • K. D. Zastrow
  • N. J. Conway
  • Jet Contributors

Department/unit(s)

Publication details

JournalJournal of Physics B: Atomic, Molecular and Optical Physics
DatePublished - 28 Jul 2015
Issue number14
Volume48
Original languageEnglish

Abstract

The W<sup>45+</sup> and W<sup>46</sup>+ 3-4d inner shell excitation lines in addition to Mo<sup>32+</sup> 2-3s lines have been identified from the spectrum taken by an upgraded high-resolution x-ray spectrometer. It is found from analysis of the absolute intensities of the W<sup>46+</sup> and Mo<sup>32+</sup> lines that W and Mo concentrations are in the range of 10<sup>-5</sup> and 10<sup>-6</sup>, respectively, with a ratio of 5% in JET with the ITER-like wall configuration for ELMy H-mode plasmas with a plasma current of 2.0-2.5 MA, a toroidal magnetic field of 2.7 T and a neutral beam injection power of 14-18 MW. For the purpose of checking self-consistency, it is confirmed that the W concentration determined from the W<sup>45+</sup> line is in agreement with that from the W<sup>46+</sup> line within 20% and that the plasma effective charge determined from the continuum of the first order reflection spectrum is also in agreement with that from the second order within 50%. Further, the determined plasma effective charge is in agreement with that determined from a visible spectroscopy, confirming that the sensitivity of the x-ray spectrometer is valid and that the W and the Mo concentrations are also likely to be valid.

    Research areas

  • crystal spectrometer, heavy impurity, impurity accumulation, radition loss, tokamak

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