Effects of rippled fields due to ferritic inserts and ELM mitigation coils on energetic ion losses in a 15 MA inductive scenario in ITER

ITERの15MA誘導駆動シナリオにおける磁性体挿入とELM緩和磁場によるリップル磁場の高速イオン損失に与える影響

篠原 孝司; 谷 啓二*; 及川 聡洋*; Putvinski, S.*; Schaffer, M.*; Loarte, A.*

Shinohara, Koji; Tani, Keiji*; Oikawa, Toshihiro*; Putvinski, S.*; Schaffer, M.*; Loarte, A.*

The energetic ion loss has been assessed by using the F3D-OFMC code for a 15 MA inductive scenario with = 10 and the latest information on the first wall geometry, the implementation of ferritic inserts (FI) and the ELM mitigation/control coils. Alpha particles and NB ions generated by the neutral beam injectors with the injection energy of 1 MeV are well confined and the heat load on the first wall is negligibly small and allowable for the magnetic background by the TFC and FI. However, an increase of the loss of these energetic ions is observed when the magnetic field by the ELM coils is applied. The increase in the loss fraction is larger for NB ions than for alpha particles under the ELM coil field. The origin of the expelled NB ions is dominantly trapped ions generated in the peripheral region due to a high density plasma of the 15 MA scenario.