Orbit-based representation of equilibrium distribution functions for low-noise initialization of kinetic simulations of toroidal plasmas

Bierwage, A.; Di Troia, C.*; Briguglio, S.*; Vlad, G.*

Computer Physics Communications, 183(5), p.1107 - 1123, 2012/05

https://doi.org/10.1016/j.cpc.2012.01.013

Progress in the ITER physics basis, 5; Physics of energetic ions

Fasoli, A.*; Gormezano, C.*; Berk, H. L.*; Breizman, B.*; Briguglio, S.*; Darrow, D. S.*; Gorelenkov, N.*; Heidbrink, W. W.*; Jaun, A.*; Konovalov, S. V.*; et al.

Nuclear Fusion, 47(6), p.S264 - S284, 2007/06

https://doi.org/10.1088/0029-5515/47/6/S05

no abstracts in English

Particle simulation analysis of energetic-particle and Alfvn-mode dynamics in JT-60U discharges

Vlad, G.*; Briguglio, S.*; Fogaccia, G.*; Shinohara, Koji; Ishikawa, Masao; Takechi, Manabu; Zonca, F.*

Proceedings of 21st IAEA Fusion Energy Conference (FEC 2006) (CD-ROM), 8 Pages, 2007/03

http://www-naweb.iaea.org/napc/physics/FEC/FEC2006/html/node378.htm#75741

The results of particle simulations of a typical NNB-heated JT-60U discharge, performed by the HMGC particle-in-cell code, are presented. We observe that the linear-growth phase is dominated by a fast-growing mode, localized at half radius, near the maximum of the energetic-ion pressure gradient and with a significant coupling with the Alfvn continuum, showing the energetic-particle-driven nature of the mode. As the nonlinear effects become important, a macroscopic outward displacement of the energetic ions is observed, producing a significant reduction of their density in the central region. These results seem to match quite well the dynamics of the abrupt large-amplitude event (ALE) experimentally observed in the JT-60U discharge. The time scale and frequency spread of the ALE are well reproduced too.