Observation of Enhanced Core Impurity Transport in a Turbulence-Reduced Stellarator Plasma
Observation of Enhanced Core Impurity Transport in a Turbulence-Reduced Stellarator Plasma
An enhancement of core impurity transport is observed for the first time in a high-density stellarator plasma with continuous lithium (Li) granule injection. When Li-granules are dropped continuously into the plasma, energy confinement is improved due to reduced turbulence. In parallel, the transport of mid- and high-Z impurities is increased. Simulations with the drift-kinetic transport code SFINCS for such plasmas show that the role of neoclassical transport prevails for the main plasma components (electrons, ions, and Zavg = 3.5). In contrast, the classical contribution is dominant in transporting high-Z impurities. This study demonstrates experimentally, for the first time also, that classical transport plays an essential role in enhancing the transport of such impurities in high-density stellarator plasmas, a situation that is achieved by continuous injection of Li-granules, which is effective for real-time wall conditioning and plasma performance improvement
Daniel Medina-Roque、Isabel GarcÃa-Cortés、Naoki Tamura、Kieran J. McCarthy、Federico Nespoli、Kenji Tanaka、Mamoru Shoji、Suguru Masuzaki、Hisamichi Funaba、Chihiro Suzuki、Albert Mollen、Robert Lunsford、Katsumi Ida、Mikiro Yoshinuma、Motoshi Goto、Yasuko Kawamoto、Tomoko Kawate、Tokihiko Tokuzawa、Ichihiro Yamada
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Daniel Medina-Roque,Isabel GarcÃa-Cortés,Naoki Tamura,Kieran J. McCarthy,Federico Nespoli,Kenji Tanaka,Mamoru Shoji,Suguru Masuzaki,Hisamichi Funaba,Chihiro Suzuki,Albert Mollen,Robert Lunsford,Katsumi Ida,Mikiro Yoshinuma,Motoshi Goto,Yasuko Kawamoto,Tomoko Kawate,Tokihiko Tokuzawa,Ichihiro Yamada.Observation of Enhanced Core Impurity Transport in a Turbulence-Reduced Stellarator Plasma[EB/OL].(2025-06-26)[2025-07-23].https://arxiv.org/abs/2506.21141.点此复制
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