@article{oai:repo.qst.go.jp:00079367,
 author = {Yamamoto, Satoshi and Nagasaki, Kazunobu and Nagaoka, Kenichi and Varela, Jacobo and Cappa, Alvaro and Ascasibar, Enrique and Castejon, Francisco and Fontdecaba, Josep and Manuel, García and Ida, Katsumi and Ishizawa, Akihiro and Isobe, Mitsutaka and Kobayashi, Shinji and Liniers, Macarena and Daniel, Lopez-Bruna and Marushchenko, Nikolai and Medina, Francisco and Melnikov, Alexander and Minami, Takashi and Mizuuchi, Tohru and Nakamura, Yuji and Ochando, Maria and Ogawa, Kunihiro and Ohshima, Shinsuke and Okada, Hiroyuki and Osakabe, Masaki and Sanders, Mike and Velasco, Jose and Weir, Gavin and Narushima, Mikiro and Gonzalez, Antonio and Yamamoto, Satoshi and Nagasaki, Kazunobu and Ida, Katsumi and Ishizawa, Akihiro},
 issue = {6},
 journal = {Nuclear Fusion},
 month = {Mar},
 note = {The effect of electron cyclotron heating (ECH) and current drive (ECCD) on energetic-particle (EP)-driven magnetohydrodynamic (MHD) modes is studied in the helical devices LHD, TJ-II and Heliotron J. We demonstrate that EP-driven MHD modes, including Alfvén eigenmodes (AEs) and energetic particle modes (EPMs), can be controlled by ECH/ECCD. In the LHD device, which has a moderate rotational transform and a high magnetic shear, co-ECCD enhances toroidal AEs (TAEs) and global AEs (GAEs), while counter-ECCD stabilizes them, which improves the neutron rate compared with the co-ECCD case. Counter-ECCD decreases the core rotational transform and increases the magnetic shear, strengthening the continuum damping on the shear Alfvén continua (SAC). In the TJ-II device, which has a high rotational transform, moderate magnetic shear and low toroidal field period, helical AEs (HAEs) appear when the HAE frequency gap of the SAC is changed by counter-ECCD combined with a bootstrap current and NB-driven current. On the other hand, both co- and counter-ECCD are effective in stabilizing GAEs and EPMs in the Heliotron J device, which has a low rotational transform and low magnetic shear. The experimental results indicate that the magnetic shear has a stabilizing effect regardless of its sign. Modelling analysis using the FAR3d code shows that the growth rates are reduced by both co- and counter-ECCD in Heliotron J, reproducing the show that the effect depends on the magnetic configuration. In Heliotron J, some modes are stabilized
experimental results. ECH only also affects EP-driven MHD modes, and the experimental results with an increase in ECH power in the low-bumpiness magnetic configuration, while some modes are destabilized in the high- and medium-bumpiness magnetic configurations.},
 title = {Effect of ECH/ECCD on Energetic-Particle-Driven MHD Modes in Helical Plasmas},
 volume = {60},
 year = {2020}
}