A photo-elastic modulator based 25-chord motional Stark effect (MSE) diagnostic has been successfully developed and commissioned in Korea Superconducting Tokamak Advanced Research. The diagnostic measures the radial magnetic pitch angle profile of the Stark splitting of a D-alpha line at 656.1 nm by the electric field associated with the neutral deuterium heating beam. A tangential view of the neutral beam provides a good spatial resolution of 1–3 cm for covering the major radius from 1.74 m to 2.28 m, and the time resolution is achieved at 10 ms. An in-vessel calibration before the vacuum closing as well as an in situ calibration during the tokamak operation was performed by means of specially designed polarized lighting sources. In this work, we present the final design of the installed MSE diagnostic and the first results of the commissioning.
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November 2016
Research Article|
July 13 2016
Initial operation of a newly developed multichord motional Stark effect diagnostic in KSTAR
J. Chung;
J. Chung
a)
1
National Fusion Research Institute
, Yuseong, Daejeon 305-333, South Korea
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J. Ko;
J. Ko
1
National Fusion Research Institute
, Yuseong, Daejeon 305-333, South Korea
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H. Wi;
H. Wi
1
National Fusion Research Institute
, Yuseong, Daejeon 305-333, South Korea
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M. Messmer
;
M. Messmer
2
Eindhoven University of Technology
, 5612 AZ Eindhoven, The Netherlands
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S. Schenkelaars;
S. Schenkelaars
2
Eindhoven University of Technology
, 5612 AZ Eindhoven, The Netherlands
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M. Scheffer;
M. Scheffer
2
Eindhoven University of Technology
, 5612 AZ Eindhoven, The Netherlands
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R. J. E. Jaspers
R. J. E. Jaspers
2
Eindhoven University of Technology
, 5612 AZ Eindhoven, The Netherlands
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a)
Electronic mail: jinil@nfri.re.kr
Contributed paper, published as part of the Proceedings of the 21st Topical Conference on High-Temperature Plasma Diagnostics, Madison, Wisconsin, USA, June 2016.
Rev. Sci. Instrum. 87, 11E503 (2016)
Article history
Received:
June 04 2016
Accepted:
June 19 2016
Citation
J. Chung, J. Ko, H. Wi, M. Messmer, S. Schenkelaars, M. Scheffer, R. J. E. Jaspers; Initial operation of a newly developed multichord motional Stark effect diagnostic in KSTAR. Rev. Sci. Instrum. 1 November 2016; 87 (11): 11E503. https://doi.org/10.1063/1.4955483
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