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Soft x-ray tomographic reconstruction of heliotron J plasma for the study of magnetohydrodynamic equilibrium and stability

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Plasma Science and Technology 2019年第6期21卷 72-78页

作者： S PUROHIT Y SUZUKI S OHDACHI S YAMAMOTO SOKENDAI The Graduate University for Advanced Studies Toki Gifu 509-5292 Japan National Institute for Fusion Science Toki Gifu 509-5292 Japan Institute of Advanced Energy Kyoto University Gokasho Uji Kyoto 611-0011 Japan

The preparation for an experimental soft x-ray tomography study on the heliotron J (H-J) machine is carried out,with the objectives of evaluating the capability of the current soft x-ray tomographic system in terms of the identification of different mode structures and their poloidal rotation,and the axis shift with different plasma and machine parameters,and fixing the physics goals for the experimental study.These preparations were carried out via a simulated soft x-ray data set arising from different plasma conditions,such as magnetic islands,low beta and high beta.Soft x-ray tomography (SXT) is performed by the discrete pixel method including singular value decomposition and Phillips-Tikhonov regularization,to obtain clear and smooth images.The H-J soft x-ray tomography results from simulated soft x-rays for the equilibrium H-J plasma sensed the magnetic axis shift clearly and an estimate was also achieved.Successful reconstruction for mode structure m =1/n =1 was obtained along with the realization of the poloidal rotation of the structure.The reconstruction for the m =2/n =1 mode was not very clear for the current soft x-ray diagnostic design.Effective mode identification was not possible due to the lack of measurements.The SXT from the current soft x-ray diagnostic on H-J,the magnetic axis shift can be estimated and the m =1/n =1 mode can be studied.Study of higher poloidal modes is difficult with the current design.

关键词： heliotron J tomography soft x-ray magnetohydrodynamics

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Effects of Sheared Flow on Microinstabilities and Transport in Plasmas

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Plasma Science and Technology 2005年第1期7卷 2610-2614页

作者： H.Sanuki K.Itoh A.Fujisawa J.Q.Dong National Institute for Fusion Science Toki Gifu 509-5292 JapanNational Institute for Fusion Science Toki Gifu 509-5292 JapanNational Institute for Fusion Science Toki Gifu 509-5292 JapanSouthwestern Institute of Physics Chengdu 610041 China

Theoretical and experimental studies associated with electric field effectson the stability and transport are briefly surveyed. The effects of radial electric field on thesuppression and/or enhancement of various microinstabilities such as drift waves, flute mode andtemperature gradient modes are discussed. The suppression of flow shear on the electron temperaturegradient mode in plasmas with slightly hollow density profiles is investigated by solving thegyrokinetic integral eigenvalue equation. Comparison between theoretical predictions andexperimental observations based on the HIBP measurements with high temporal and spatial resolutionsis made in bumpy tori and heliotron (CHS) devices.

关键词： sheared flow microinstabilities transport bumpy tori heliotron

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