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Volume 89, Issue 4
April 2018
Research Article| April 05 2018
S. Sarwar;
S. Sarwar a)
1
Institute of Space Technology
, P.O. Box 2750, Islamabad 44000,
Pakistan
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H. K. Na
;
H. K. Na
2
National Fusion Research Institute
, 113 Gwahangno, Yuseong-Gu, Daejeon 305-333,
South Korea
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J. M. Park
J. M. Park
2
National Fusion Research Institute
, 113 Gwahangno, Yuseong-Gu, Daejeon 305-333,
South Korea
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Author & Article Information
a)
Author to whom correspondence should be addressed: msajjadus@yahoo.com
Rev. Sci. Instrum. 89, 043504 (2018)
Article history
Received:
September 12 2017
Accepted:
March 13 2018
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Citation
S. Sarwar, H. K. Na, J. M. Park; Effective ion charge (Zeff) measurements and impurity behavior in KSTAR. Rev. Sci. Instrum. 1 April 2018; 89 (4): 043504. https://doi.org/10.1063/1.5004217
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A visible bremsstrahlung detector array diagnostic system has been developed on the Korea Superconducting Tokamak Advanced Research (KSTAR) to view the whole minor radius in a narrow region of the continuum free of spectral lines. The interference filters coupled with photomultiplier tubes have been employed to determine the effective charge Zeff by using visible bremsstrahlung data during neutral beam injection in the KSTAR plasma. The Zeff profiles are typically flat for L-mode plasmas and evolve to hollow profiles during the H mode in the KSTAR. A comparison of the visible bremsstrahlung emission based on the calculated Zeff profiles is consistent with measured values of Zeff from a visible spectrometer in the core plasma. The electron temperature is measured by X-ray imaging crystal spectrometry, and electron density needed for the analysis is taken by the assumption of parabolic profiles of these parameters. The line of sight averaged local bremsstrahlung emissivity is determined with low uncertainty, and the radial emissivity is obtained by using the Abel inversion technique. In addition, a dependence of effective charge Zeff on the line-averaged electron density is evaluated, and Zeff is also determined to observe the effect of boronization.
Topics
Electron density, Bremsstrahlung, Surface hardening, Integral transforms, Optical filters, X-ray imaging, Leptons, Spectrometry, Visible spectroscopy, Plasma confinement
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