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論文

Investigation of the helical divertor function and the future plan of a closed divertor for efficient particle control in the LHD plasma periphery

庄司 主*; 増崎 貴*; 小林 政弘*; 後藤 基志*; 森崎 友宏*; 山田 弘司*; 小森 彰夫*; 岩前 敦; 坂上 篤史*; LHD実験グループ*

Fusion Science and Technology, 58(1), p.208 - 218, 2010/07

 被引用回数:9 パーセンタイル:40.28(Nuclear Science & Technology)

The function of the divertor plasmas on the particle control in the plasma periphery is investigated from view points of magnetic field line structure and neutral particle transport. It shows that the particle and heat deposition on the divertor plate arrays are explained by the distribution of strike points calculated by magnetic field line tracing with a randam walk process, which is experimentally supported by measurements in various magnetic configurations. Control of neutral particle fueling from the divertor plate is essential for sustaining long pulse discharges and achieving Super Dense Core plasma. The behavior of neutral particles in the plasma periphery has been investigated by $${rm H}_{alpha}$$ emission measurements and a neutral particles transport simulation. It reveals that the main particle source in an ICRF heated long pulse discharge is from the divertor plates heated by protons accelerated by ICRF waves, and the spatial profile of the neutral particle density in various magnetic configurations is explained by the distribution of the strike points. Basing on this analysis, a closed divertor configuration optimized for the intrinsic magnetic field line structure in the Large Helical Devices is proposed for efficient particle control and heat load reduction on the divertor plates.

論文

Alignment creation and deviation from statistical population distribution in hydrogen $$n$$=3 levels observed on MSE spectra of LHD plasma

岩前 敦; 坂上 篤史*; 安宅 誠*; 澤田 圭司*; 後藤 基志*; 森田 繁*

Plasma Physics and Controlled Fusion, 51(11), p.115004_1 - 115004_15, 2009/11

 被引用回数:6 パーセンタイル:72.64(Physics, Fluids & Plasmas)

We have observed motional-Stark-effect (MSE) spectra of Balmer-$${alpha}$$ line emitted from a heating neutral-hydrogen beam on the Large Helical Device. Polarization-resolved spectral profile indicates that the magnetic-sublevel populations in the upper level slightly deviate from the statistical distribution, i.e., alignment is created. The theoretical proton-impact cross sections with the assumption of corona equilibrium, however, lead to a profile in gross disagreement with the observed one. It is suggested that, the observed profile is the result of time integration of light emission of atoms during the relaxation process, i.e., the aligned population distribution is created by the directional proton collisions and elastic proton collisions destroy the alignment, finally leading to statistical distribution.

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