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論文

Summary of 21st joint EU-US Transport Task Force Workshop (Leysin, September 5-8, 2016)

Mantica, P.*; Bourdelle, C.*; Camenen, Y.*; Dejarnac, R.*; Evans, T. E.*; G$"o$rler, T.*; Hillesheim, J.*; 井戸村 泰宏; Jakubowski, M.*; Ricci, P.*; et al.

Nuclear Fusion, 57(8), p.087001_1 - 087001_19, 2017/08

 被引用回数:6 パーセンタイル:33.17(Physics, Fluids & Plasmas)

本会議報告は2016年9月5日$$sim$$8日にスイス、レザンにて開催されたthe 21st Joint EU-US Transport Task Force Workshopにおける報告と議論をまとめたものである。ワークショップは以下の8つのトピックから構成された: full-F運動論的乱流シミュレーションの進展; 高Z、低Z不純物の輸送、制御、および、プラズマ閉じ込めへの影響; 炉心、周辺輸送への3次元効果(MHD、外部磁場、ステラレータを含む); 予測性の高いプラズマ設計; 電子熱輸送とマルチスケール統合; Scrape-Off Layer(SOL)におけるパワー減衰長の理解; L-H遷移におけるSOLの役割; 乱流計測に対する乱流基礎特性の実証研究。

論文

Overview of toroidal momentum transport

Peeters, A. G.*; Angioni, C.*; Bortolon, A.*; Camenen, Y.*; Casson, F. J.*; Duval, B.*; Fiederspiel, L.*; Hornsby, W. A.*; 井戸村 泰宏; Hein, T.*; et al.

Nuclear Fusion, 51(9), p.094027_1 - 094027_13, 2011/09

 被引用回数:99 パーセンタイル:97.28(Physics, Fluids & Plasmas)

Toroidal momentum transport mechanisms are reviewed and put in a broader perspective. The generation of a finite momentum flux is closely related with the breaking of symmetry (parity) along the field. The symmetry argument allows for the systematic identification of possible transport mechanisms. Those that appear to lowest order in the normalized Larmor radius (the diagonal part, Coriolis pinch, E$$times$$B shearing, particle flux, and up-down asymmetric equilibriums) are reasonably well understood. At higher order, thought to be of importance in the plasma edge, the theory is still under development.

論文

Consequences of profile shearing on toroidal momentum transport

Camenen, Y.*; 井戸村 泰宏; Jolliet, S.; Peeters, A. G.*

Nuclear Fusion, 51(7), p.073039_1 - 073039_11, 2011/07

 被引用回数:87 パーセンタイル:96.39(Physics, Fluids & Plasmas)

Turbulent transport of toroidal momentum is investigated in global linear gyrokinetic simulations. The poloidal tilt of the global mode structure arising from the radial variation of the equilibrium (profile shearing) is shown to induce non-diagonal non-pinch momentum transport (residual stress). Local simulations performed at finite radial wave vector show that the effect is mainly due to the antisymmetric radial component of the magnetic drift. The residual stress resulting from profile shearing enhances co-current rotation for ion temperature gradient turbulence and counter-current rotation for trapped electron mode turbulence (for positive magnetic shear).

論文

Overview of anomalous toroidal momentum transport

Peeters, A. G.*; Angioni, C.*; Bortolon, A.*; Camenen, Y.*; Casson, F. J.*; Dubal, B.*; Fiederspiel, L.*; Hornsby, W. A.*; 井戸村 泰宏; Kluy, N.*; et al.

Proceedings of 23rd IAEA Fusion Energy Conference (FEC 2010) (CD-ROM), 13 Pages, 2011/03

Toroidal momentum transport mechanisms are reviewed and put in a broader perspective. The generation of a finite momentum flux is closely related with the breaking of symmetry along the field. The symmetry argument allows for the systematic identification of possible transport mechanisms. Those that appear to lowest order in the normalized Larmor radius (the diagonal part, Coriolis pinch, E$$times$$B shearing, particle flux, and up-down asymmetric equilibriums) are reasonably well understood. At higher order, thought to be of importance in the plasma edge, the theory is still under development.

論文

Transport and turbulence with innovative plasma shapes in the TCV tokamak

Labit, B.*; Pochelon, A.*; Rancic, M.*; Piras, F.*; Bencze, A.*; Bottino, A.*; Brunner, S.*; Camenen, Y.*; Chattopadhyay, P. K.*; Coda, S.*; et al.

Proceedings of 23rd IAEA Fusion Energy Conference (FEC 2010) (CD-ROM), 8 Pages, 2011/03

We present recent results on turbulence measurements in TCV L-mode plasmas. The transport reduction at negative triangularity (compared to positive triangularity) is reflected in the reduction of the temperature fluctuation level, in the low frequency part of the spectrum (30-150 kHz), measured by correlation ECE in the outer equatorial plane. The TEM induced transport computed from nonlinear gyrokinetic simulations is shown to decrease with decreasing triangularity and increasing collisionality. First results of an experimental scenario to reach the H-mode regime at negative triangularity in TCV are presented. Then, we report on an innovative divertor magnetic configuration: the snowflake (SF) divertor as opposed to the classical single-null (SN) divertor. For ELMy SF plasmas, the strike-point properties (density, temperature, fluctuation level,...) are studied with Langmuir probes (LPs) and compared with those of a SN configuration obtained within the same discharge.

口頭

運動量輸送におけるプラズマサイズ及び運動論的電子応答の影響

井戸村 泰宏; Jolliet, S.; Camenen, Y.*

no journal, , 

グローバルジャイロ運動論的full-fブラゾフコードGT5Dの運動論的電子モデルを開発し、ITG-TEM乱流の線形解析を行った。この解析において局所フラックスチューブジャイロ運動論コードGKWとのベンチマークを実施し、有限プラズマサイズ効果によって発生するモード構造の変化とそれに伴う残留応力の発生を発見した。さらに、この残留応力はITG及びTEMそれぞれが支配的なパラメータ領域で符号が逆転することを発見した。この結果は主要なモードによって残留応力が駆動するプラズマ回転の向きが変化しうることを示している。

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