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篠原 孝司; 谷 啓二*; 及川 聡洋*; Putvinski, S.*; Schaffer, M.*; Loarte, A.*
Nuclear Fusion, 52(9), p.094008_1 - 094008_12, 2012/09
被引用回数：20 パーセンタイル：64.59(Physics, Fluids & Plasmas)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.
篠原 孝司; Kurki-Suonio, T.*; Spong, D. A.*; Asunta, O.*; 谷 啓二*; Strumberger, E.*; Briguglio, S.*; Koskela, T.*; Vlad, G.*; G
nter, S.*; et al.
Nuclear Fusion, 51(6), p.063028_1 - 063028_12, 2011/06
被引用回数：46 パーセンタイル：86.41(Physics, Fluids & Plasmas)Within the ITPA Topical Group on Energetic Particles, we have investigated the impact of the axisymmetry breaking of the tokamak in ITER. First, the validity of using a 2D equilibrium was investigated: a 3D equilibrium was reconstructed using the VMEC code, and it was verified that no 3D equilibrium reconstruction is needed but it is sufficient to add the vacuum field perturbations onto an 2D equilibrium. Then the alpha particle confinement was studied using ASCOT, and F3D OFMC codes. The distribution of the power load was found to depend on the first wall shape. We also made the first attempt to accommodate the effect of fast ion related MHD on the wall loads in ITER using the HMGC and ASCOT codes. The peak power flux to the wall was found to increase by an order of magnitude. Furthermore, the effect of 3D field which was produced by the ELM mitigation coil on the fast ion confinement was addressed by simulating NBI ions with the F3D OFMC code. The loss power fraction of NBI ions was found to increase from 0.3% to 4-5%.
篠原 孝司; Kurki-Suonio, T.*; Spong, D.*; Asunta, O.*; 谷 啓二*; Strumberger, E.*; Briguglio, S.*; Gnter, S.*; Koskela, T.*; Kramer, G.*; et al.
Proceedings of 23rd IAEA Fusion Energy Conference (FEC 2010) (CD-ROM), 8 Pages, 2011/03
Within the ITPA Topical Group on Energetic Particles, we have investigated the impact of the axisymmetry breaking of the tokamak in ITER. First, the validity of using a 2D equilibrium was investigated: a 3D equilibrium was reconstructed using the VMEC code, and it was verified that no 3D equilibrium reconstruction is needed but it is sufficient to add the vacuum field perturbations onto an 2D equilibrium. Then the alpha particle confinement was studied using ASCOT, and F3D OFMC codes. The distribution of the power load was found to depend on the first wall shape. We also made the first attempt to accommodate the effect of fast ion related MHD on the wall loads in ITER using the HMGC and ASCOT codes. The peak power flux to the wall was found to increase by an order of magnitude. Furthermore, the effect of the ELM mitigation field on the fast ion confinement was addressed by simulating NBI ions with the F3D OFMC code. The loss power fraction of NBI ions was found to increase from 0.3% to 5.6%.
