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RISS 인기검색어
- 검색키워드
- 주제어 : Motional Stark effect (검색결과 2 건)
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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.
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Lee, Kyuhang,Ko, Jinseok,Jo, Jae Heung,Chung, Jinil Elsevier 2017 Fusion engineering and design Vol.121 No.-
<P><B>Abstract</B></P> <P>An optical system capable of preserving, or minimizing the change of, the polarization properties of incident light has been designed and fabricated for the motional Stark effect diagnostic system which measures internal magnetic field structures inside the tokamak for the Korea Superconducting Tokamak Advanced Research. A dual photoelastic modulator (PEM) with a linear polarizer is included in the optical train with four lenses, a mirror and a dichroic beam splitter. Particular cares have been taken for the polarization properties of the delivered light to be perturbed as little as possible under a strong magnetic field and high vacuum. The lenses are made of STIH-6, a material with low Verdet constant, which minimizes the Faraday rotation. The residual Faraday rotation that takes place in the non-STIH-6 optical elements such as the vacuum window and the optical apertures of the PEM is calibrated out from the in-situ measurements using an in-vessel reference polarizer while energizing the magnetic field coils. In the lens design, the object plane is rotated by 44.8° from the optical axis because of the tilted setup-port. The image surface has a finite curvature to reduce the aberration from the four lenses. The fiber dissector is designed based on the focal plane that aligns the focal points from 25 lines-of-sight, each of which constitutes a bundle of 19 fibers. The fibers run about 35m from the front optics in the tokamak vacuum vessel to the detector in the diagnostic area remote from the tokamak hall. The footprint images at the intersections of the lines-of-sight on the neutral beam trajectory confirms the imaging quality is sufficient to the diagnostic requirement with the designed magnifications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Description on how the polarization control is accomplished in the complex optics for the KSTAR MSE system. </LI> <LI> Various quantitative analyses for the optical performance in accommodating multiple and tilted observation chords. </LI> <LI> Integration of the fabricated components including the fiber bundles and the dissector module for them. In-vessel testing for the image formation with the integrated optics system. </LI> </UL> </P>
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