Initial operation of a newly developed multichord motional Stark effect diagnostic in KSTAR

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...

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Bibliographic Details
Published in:Review of scientific instruments 2016-11, Vol.87 (11), p.11E503-11E503
Main Authors: Chung, J., Ko, J., Wi, H., Messmer, M., Schenkelaars, S., Scheffer, M., Jaspers, R. J. E.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAMS
CALIBRATION
DEUTERIUM
Diagnostic systems
ELECTRIC FIELDS
HEATING
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
KOREAN ORGANIZATIONS
Neutral beams
Pitch (inclination)
Scientific apparatus & instruments
SPATIAL RESOLUTION
STARK EFFECT
TIME RESOLUTION
TOKAMAK DEVICES
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Summary: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.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4955483