@article{oai:repo.qst.go.jp:00084926,
 author = {Adulsiriswad, P. and Todo, Y. and Kado, S. and Satoshi, Yamamoto and Kobayashi, S. and Ohshima, S. and Okada, H. and Minami, T. and Nakamura, Y. and Ishizawa, A. and Konoshima, S. and Mizuuchi, T. and Nagasaki, K. and Satoshi, Yamamoto},
 issue = {11},
 journal = {Nuclear Fusion},
 month = {Nov},
 note = {The interaction between energetic particles (EPs) and EP-driven magnetohydrodynamic (MHD) instabilities in Heliotron J, a low-shear helical axis stellarator/heliotron, is investigated with MEGA, a hybrid MHD-EP simulation code with the free boundary condition, on the last closed flux surface. The n/m = 1/2 energetic particle mode (EPM) and the n/m = 2/4 global Alfvén eigenmode (GAE) in the peripheral plasma region of Heliotron J are successfully modeled with the free boundary condition. The free boundary condition affects the EP driving rate of the n/m = 1/2 EPM and the n/m = 2/4 GAE through the changes in the mode spatial profile. Under the fixed boundary condition, the linear growth rate of the EP-driven MHD mode with low mode numbers is underestimated. The interaction between EP and these experimentally-observed modes is kinetically analyzed. It is found that the strongest EP–shear Alfvén wave interactions arise from the toroidicity-induced resonances in the high-velocity region. These high-velocity EPs can efficiently interact with the peripheral EP-driven mode. The additional toroidally-asymmetric resonances are localized in the low-velocity region; therefore, their effects are weak for the bump-on-tail EP velocity distribution function.},
 title = {Numerical investigation into the peripheral energetic-particle-driven MHD modes in Heliotron J with free boundary hybrid simulation},
 volume = {61},
 year = {2021}
}