@misc{oai:repo.qst.go.jp:00084063, author = {Bierwage, Andreas and Koji, Shinohara and Kazakov, Yevgen and Kiptily, Vasili and Lauber, Philipp and Nocente, Massimo and Stancar, Ziga and Shuhei, Sumida and Masatoshi, Yagi and Garcia, Jeronimo and Shunsuke, Ide and Contributors, JET and Bierwage, Andreas and Koji, Shinohara and Shuhei, Sumida and Masatoshi, Yagi and Shunsuke, Ide}, month = {Dec}, note = {A relaxation even known as “sawtooth crash” is simulated in a large tokamak plasma with monotonic safety factor close to unity. The domain and the time scale of the event are set to match observations. The simulation follows passive alpha particles with energies 35 keV-3.5 MeV, whose initial density peak is localized in the relaxing domain. While the 35 keV profile flattens, a synergy of multiple physical factors allows the 3.5 MeV profile to remain peaked, facilitating the use of benign sawtooth activity in a fusion reactor to expel helium ash while preserving good confinement of fast alphas., 17th Technical Meeting on Energetic Particles and Theory of Plasma Instabilities in Magnetic Confinement Fusion (EPPI)}, title = {Numerical study of helium ash and fast particle dynamics in a sawtoothing tokamak plasma}, year = {2021} }