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論文

Progresses in development of the ITER edge Thomson scattering system

谷塚 英一; Bassan, M.*; 波多江 仰紀; 石川 正男; 嶋田 恭彦; Vayakis, G.*; Walsh, M.*; Scannell, R.*; Huxford, R.*; Bilkova, P.*; et al.

Journal of Instrumentation (Internet), 8(12), p.C12001_1 - C12001_10, 2013/12

 被引用回数:6 パーセンタイル:34.98(Instruments & Instrumentation)

In ITER, the edge Thomson scattering system (ETS) is one of the primary diagnostic systems for measuring electron temperature and electron density profiles of edge plasma. In order to provide a high throughput of scattered light against a low throughput of neutron and $$gamma$$ ray from plasma, collection optics with a labyrinthine optical path in the port plug was designed. A combination of in-situ calibration (using two lasers with different wavelengths) and periodic calibration (using a super-continuum light source illuminating shutter rear-plate covered with a diffusive material) would provide accurate measurements in ITER against the degradation of spectral transmissivity due to the harsh radiation environment and sputtering/contamination of the first mirror. Specifications of subsystems were determined from assessments of measurement error. It was confirmed that the ETS will work in ITER with the specifications achieved by present technologies.

論文

An Optical design and accuracy estimation for a JT-60SA edge Thomson scattering diagnostic

東條 寛; 波多江 仰紀; 濱野 隆; 佐久間 猛; 伊丹 潔

Journal of Instrumentation (Internet), 8(12), p.C12025_1 - C12025_13, 2013/12

 被引用回数:1 パーセンタイル:8.02(Instruments & Instrumentation)

For collection optics for the edge measurements in a JT-60SA Thomson scattering diagnostic, a compact Petzval-like lens system with smaller lenses (200 mm in diameter) is designed so that the stop position is the middle area of the system, which is effective to miniaturize the lens size. Use of two flat mirrors placed in the middle area enables preventing interferences with the space limit. Generally, the angle ($$phi$$) between the scattering plane determined from the collection optics position and the laser polarization angle should be equal to 90$$^{circ}$$. Otherwise the measured intensity of scattered light decays with $$phi$$. We optimized the angle so that enough intensity is provided for both collection optics positions for the edge and core measurements. It was found that the minimum error in $$T_{rm e}$$ was given at a condition with $$phi=57.2^{circ}$$ for edge optics ($$phi=50.0^{circ}$$ for core optics).

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