Application of Low Activation Ferritic Steel in the JFT-2M Tokamak –Evaluation of Magnetic Effect on the Plasma–

N. Isei; M. Sato; K. Tsuzuki; H. Kawashima; Y. Miura; H. Kimura; JFT-2M Group

doi:dx.doi.org/10.13182/FST01-A11963391

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Application of Low Activation Ferritic Steel in the JFT-2M Tokamak –Evaluation of Magnetic Effect on the Plasma–

N. Isei, M. Sato, K. Tsuzuki, H. Kawashima, Y. Miura, H. Kimura, JFT-2M Group

Fusion Science and Technology / Volume 39 / Number 2P2 / March 2001 / Pages 1101-1105

Plasma Engineering, Heating, and Current Drive / dx.doi.org/10.13182/FST01-A11963391

Published:February 8, 2018

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Magnetic effect of ferritic steel board (FB) on the plasma was experimentally investigated in the JFT-2M tokamak. Clear deterioration by the error field was not observed even in the condition of toroidally unbalanced placement of FBs outside vacuum vessel (VV). Deteriorating effects were not observed with the FBs inside VV for the operational region and the control of plasma, although slight discrepancy in the relation of vertical-coil current and equilibrium was found. Compatibility of FBs with high normalized-beta plasma (β_N up to 2.7) was demonstrated after boronization.