著者

飛田 健次 濱松 清隆 滝塚 知典 鈴木 正信

出版者

社団法人プラズマ・核融合学会

雑誌

プラズマ・核融合学会誌 (ISSN:09187928)

巻号頁・発行日

vol.75, no.5, pp.582-593, 1999-05-25

被引用文献数

5 6

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Ripple loss of energetic alpha particles and neutral beam ions was calculated for reversed shear discharges in ITER-FDR(Final Design Report). The result indicates that, compared with normal operation with positive shear, reversed shear operation dramatically enhances the ripple loss. Ripple loss of alpha particles can reach 25% with the maximum heat load of 3.7MW/m^2 on the outboard wall, while that of a 1MeV negative ion source beam can be as high as 20% as well. The heat load due to alpha particle loss is marginal in the light of a wall tolerance. The calculation suggests that the Toroidal Field(TF)ripple in a fusion reactor should be designed to be less than 0.6% at the plasma surface so that ripple loss of alpha particles or beam ions can be acceptably low. Ferritic steel insert to the vacuum vessel, is a probable solution to reduce the ripple loss to an allowable level in the ITER-FDR design with the TF ripple reduction of by a factor of 0.4. With TF ripple reduction, ripple loss for alpha particles and beam ions is expected to decrease to 10% and 4%, respectively.