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

TY - JOUR

T1 - Determination of tungsten and molybdenum concentrations from an x-ray range spectrum in JET with the ITER-like wall configuration

AU - Nakano, T.

AU - Shumack, A. E.

AU - Maggi, C. F.

AU - Reinke, M.

AU - Lawson, K. D.

AU - Coffey, I.

AU - Pütterich, T.

AU - Brezinsek, S.

AU - Lipschultz, B.

AU - Matthews, G. F.

AU - Chernyshova, M.

AU - Jakubowska, K.

AU - Scholz, M.

AU - Rzadkiewicz, J.

AU - Czarski, T.

AU - Dominik, W.

AU - Kasprowicz, G.

AU - Pozniak, K.

AU - Zabolotny, W.

AU - Zastrow, K. D.

AU - Conway, N. J.

AU - Contributors, Jet

PY - 2015/7/28

Y1 - 2015/7/28

N2 - The W45+ and W46+ 3-4d inner shell excitation lines in addition to Mo32+ 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 W46+ and Mo32+ lines that W and Mo concentrations are in the range of 10-5 and 10-6, 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 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.

AB - The W45+ and W46+ 3-4d inner shell excitation lines in addition to Mo32+ 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 W46+ and Mo32+ lines that W and Mo concentrations are in the range of 10-5 and 10-6, 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 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.

KW - crystal spectrometer

KW - heavy impurity

KW - impurity accumulation

KW - radition loss

KW - tokamak

UR - http://www.scopus.com/inward/record.url?scp=84936805977&partnerID=8YFLogxK

U2 - 10.1088/0953-4075/48/14/144023

DO - 10.1088/0953-4075/48/14/144023

M3 - Article

AN - SCOPUS:84936805977

SN - 0953-4075

VL - 48

JO - Journal of Physics B: Atomic, Molecular and Optical Physics

JF - Journal of Physics B: Atomic, Molecular and Optical Physics

IS - 14

M1 - 144023

ER -