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Enhanced particle confinement and turbulence reduction due to E × B shear in the TEXTOR tokamak

J. Boedo, D. Gray, S. Jachmich, R. Conn, G.P. Terry, G. Tynan, G. Van Oost, R.R. Weynants, TEXTOR Team2000年被引用 78Nuclear FusionIF 3出版社

Positive radial electric fields have been created at the edge of theTEXTOR tokamak plasma using an electrode. The electric field induces athin (δr∼1.5 cm), E × B driven layer at the edge rotating poloidally at12-20 km/s and featuring high shear. Concomitant changes in thedensity and poloidal electric field fluctuations and their cross-phasein the shear layer result in suppression of radial turbulentparticle transport, even at low radial electric fieldstrength. Temperature fluctuations are reduced, resulting indiminished turbulent heat flux. As turbulent particle transport isquenched, the particle confinement time τp increases by a factor of 2 andthe energy confinement time τE by 20%. Turbulent transport accountsfor ∼50% of the total particle flux. Both the cross-phase and thedensity fluctuations are sensitive to the sign of ∇Er.

日本語訳

正の径方向電場がTEXTORトカマクプラズマの周辺部に電極を用いて生成された。この電場は、周辺部においてポロイダル方向に12〜20 km/sで回転し、高いシアを特徴とする薄い(δr∼1.5 cm)E × Bドリフト層を誘起する。シア層内での密度およびポロイダル電場揺動とそれらの相互位相の concomitant な変化は、低い径方向電場強度においても径方向乱流輸送の抑制をもたらす。温度揺動は低減され、その結果乱流熱流束は減少する。乱流粒子輸送が抑制されると、粒子閉じ込め時間τpは2倍に増加し、エネルギー閉じ込め時間τEは20%増加する。乱流輸送は全粒子束の約50%を占める。相互位相と密度揺動の両方が∇Erの符号に敏感である。

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