Influence of sawtooth oscillations on fast ions in a stellarator

Dmitry Moseev, Marco Zanini,Hiroshi Kasahara,Heinrich Laqua,Hisamichi Funaba, Wataru Hayashi,William W Heidbrink,Katsumi Ida,Hiroe Igami,Yasuko Kawamoto,Naoki Kenmochi,Samuel A Lazerson,Masaki Nishiura,Roman Ochoukov,Kunihiro Ogawa, Mads Rud Larsen,Mirko Salewski, Tetsuo Seki,Naoki Tamura,Kenji Tanaka,Tokihiko Tokuzawa, M Yoshinuma

Nuclear Fusion（2024）

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摘要

Abstract Sawtooth oscillations in tokamaks frequently lead to the redistribution of energetic ions, mainly on passing orbits, causing their expulsion from the core. This paper discusses the first measurements of the interaction of fast ions and sawteeth in the Large Helical Device (LHD). The crashes, caused by changed rotational transform profile due to electron cyclotron current drive (ECCD) and neutral beam current drive (NBCD), show no redistribution effect on fast ions in the core or at the edge.

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