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Motional Stark Effect Diagnostics for KSTAR
J. Chung,고진석,J. Howard,C. Michael,G. von Nessi,A. Thorman,M. F. M. De Bock 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.8
The motional Stark effect (MSE) diagnostic is used to measure the radial magnetic pitch-angleprofile in neutral-beam-heated plasmas. The diagnostic relies upon the measurement of the polarizationdirection of Stark-split D-alpha emission from injected fast neutral atoms in a magnetic field. Measurements of the magnetic pitch angle are used with magnetic equilibrium reconstruction codessuch as EFIT to calculate the safety factor in shaped plasmas. The MSE diagnostic is importantfor determining the shape of the q profile to optimize confinement and stability, and it has becomea key element in high-performance tokamaks. For the purpose of achieving the high-performanceoperating region in the Korea Superconducting Tokamak Advanced Research KSTAR device, twotypes of methods are being studied. In KSTAR, a multichord PEM (photo-elastic modulator)-basedMSE system is being developed, and an imaging MSE polarimetry system using the coherence imagingtechnique has been showing promising initial results during the last two KSTAR experimentalcampaigns in 2012 and 2013, respectively. In this paper, we describe the progress of the KSTARMSE diagnostics.