FusionPapers
図版検索トレンドwiki日本の研究
© 2026 FUSIONPAPERS
About法務情報
トップに戻る

Energetic ion losses 'channeling' mechanism and strategy for mitigation

F Nabais, João P S Bizarro, D Borba, R Coelho, J Ferreira, A Figueiredo, M Fitzgerald, C Hellesen, V Kiptily, M Mantsinen2019年Plasma Physics and Controlled FusionIF 2.2出版社

Results from two different sets of JET experiments are presented. In experiments in which toroidicity-induced Alfvén eigenmodes (TAEs) localized at different radial locations had the same frequencies and toroidal mode numbers, the occurrence of enhanced losses after the excitation of TAEs in the core of the plasma was observed. On the contrary, enhanced losses were not observed if the TAEs localized at different radial locations had different frequencies and toroidal mode numbers. Numerical modeling indicates that, in the first set of experiments, the enhanced losses were caused by a combined effect of the TAEs localized at different radial locations. The TAEs localized in the plasma core transported energetic ions from the core to outer regions of the plasma. Then, the TAEs localized in outer regions of the plasma interacted with these ions just transported by the core-localized TAEs causing a further radial displacement of the ions to the plasma edge. This process eventually ends up causing the loss of the resonant ions. In the second set of experiments, it was found that TAEs localized in the plasma core and in outer regions did not interact with the same ions and so no enhanced losses were measured. Sheared profiles of the safety factor combined with flat mass density profiles lead to larger differences on the frequencies of the TAEs localized at different radial locations, eventually avoiding loss of energetic ions through the described mechanism.

日本語訳

2つの異なるJET実験セットの結果を提示する。異なる半径位置に局在するトロイダル性誘起アルヴェン固有モード(TAE)が同一の周波数とトロイダルモード数を有する実験では、プラズマコアにおけるTAE励起後の増大した損失の発生が観測された。対照的に、異なる半径位置に局在するTAEが異なる周波数とトロイダルモード数を有する場合には、増大した損失は観測されなかった。数値モデリングは、最初の実験セットにおいて、増大した損失が異なる半径位置に局在するTAEの複合効果によって引き起こされたことを示している。プラズマコアに局在するTAEは、高エネルギー粒子をコアから外側領域へ輸送した。その後、外側領域に局在するTAEが、コア局在TAEによって輸送されたばかりのこれらの粒子と相互作用し、粒子のプラズマ端へのさらなる半径方向変位を引き起こした。この過程は最終的に共鳴粒子の損失をもたらす。2番目の実験セットでは、コアおよび外側領域に局在するTAEが同一の粒子と相互作用しないことが判明し、その結果、増大した損失は測定されなかった。安全係数のシアプロファイルと質量密度プロファイルの組み合わせにより、異なる半径位置に局在するTAEの周波数差が大きくなり、結果として記述されたメカニズムによる高エネルギー粒子の損失が回避された。

装置

jet低精度(概要文一致)

wiki

Energetic ionIon loss
この論文にはまだAI要約がありません。

関連論文

Experimental study of core-localized TAEs during ICRF heated high βp plasmas on EAST

2026Nuclear Fusion

Fast ion redistribution and losses in JET advanced tokamak scenario

2010Nuclear Fusion

Energetic ion driven Alfvén eigenmodes in Large Helical Device plasmas with three-dimensional magnetic structure and their impact on energetic ion transport

2004Plasma Physics and Controlled Fusion

Pitch-angle distribution of TAE-induced losses of ICRH accelerated ions on JET

2014Nuclear Fusion

Experimental studies of energetic-ion-driven MHD instabilities in Large Helical Device plasmas

2005Nuclear Fusion

Magnetic configuration effects on TAE-induced losses and a comparison with the orbit-following model in the Large Helical Device

2012Nuclear Fusion

Stability of toroidicity induced shear Alfvén eigenmodes in ASDEX Upgrade

2009Plasma Physics and Controlled Fusion

Alpha particle transport induced by TAE in CFETR steady-state scenario

2026Nuclear Fusion

Beam anisotropy effect on Alfvén eigenmode stability in ITER-like plasmas

2005Nuclear Fusion

Simulation of the TAEs' saturation phase in the Large Helical Device: MHD burst

2022Nuclear Fusion