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

TitleDetermination of tungsten and molybdenum concentrations from an x-ray range spectrum in JET with the ITER-like wall configuration
Publication TypeJournal Article
Year of Publication2015
AuthorsT. Nakano, A.E Shumack, C.F Maggi, M. Reinke, K.D Lawson, I. Coffey, T. Putterich, S. Brezinsek, B. Lipschultz, 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
JournalJournal of Physics B-Atomic Molecular and Optical Physics
Volume48
Issue14
Pagination144023
Date PublishedJul 28
ISBN Number0953-4075
Abstract

The W45+ and W46+ 3p-4d inner shell excitation lines in addition to Mo32+ 2p-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 W46+ and Mo32+ lines that W and Mo concentrations are in the range of similar to 10(-5) and similar to 10(-6), respectively, with a ratio of similar to 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 W45+ line is in agreement with that from the W46+ 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.

DOI10.1088/0953-4075/48/14/144023
Division

FP

Department

PDG

PID

500392ea426497a366fc42565ddbfca7

Alternate TitleJ. Phys. B

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