Generalized Physics Mechanisms of Plasma Confinement with Radially Sheared Electric Field Formation by High Power ECH and Verification of Newly Developed Plasma Stabilization Method

1.这些年来，在离子温度为几keV的热离子模式下，离子限制电位高度（φ_c）取得了四次进展，并且在插入式电子回旋加热（ECH）功率下，φ_c的标度得到了良好的提高。势形成的进展导致发现径向剪切电场在抑制湍流和减少横向损失方面的显著效果。结果表明，φ_c随密度的增加呈较弱的衰减关系，衰减范围为~ 10^<19> m^<-3>， φ_c的采收率随plug - ECH功率的增加而增加。首次在势垒镜中利用离轴ECH产生了横向能量输运势垒，形成了一个具有高能电子流过整个装置的圆柱形层。这导致层附近的间歇性湍流涡状结构被抑制，并导致电子温度和离子温度升高，被具有局部碰撞双极势Φ_c的层包围。径向输运屏障的形成可以解释为强烈的E_r剪切或峰值涡量W的形成，并且在Φ_c峰值附近E_r×B剪切流的方向反转以抑制湍流。标准串联镜操作中的初步中心ECH （170kW,20ms）将T_<eO>从70 eV提高到300 eV， T_<i⊥O>从4.5 keV提高到6.1 keV, T_<i//O>从0.5 keV提高到1.2 keV, τ_<pO>=95 ms, φ_c（=1.4 kV）捕获离子。φ_c捕获离子的轴向粒子与能量约束比τ_<pO>/τ_<EO>为1.7（符合Pastukhov理论），240 kw plug ECH和90 kw ICH捕获离子的轴向粒子与能量约束比为2.4 （η_<ICH> ~ 0.3;nl_c=4.5×10^<17>m^<-2>）。

1.Four-time progress in ion-confining potential height (φ_c) through these years is achieved in the hot-ion mode with an ion temperature of several keV having the favorably increasing scaling of φ_c with plug electron-cyclotron heating (ECH) powers.2.The advance in the potential formation leads to a finding of remarkable effects of radially sheared electric fields on turbulence suppression and transverse-loss reduction.3.A preferable dependence of a weak decrease in φ_c with increasing density ranging to 〜10^<19> m^<-3> along with the recovery of φ_c with increasing plug ECH powers is obtained.4.A transverse energy-transport barrier is produced by off-axis ECH in a barrier mirror for the first time, with the formation of a cylindrical layer having energetic electrons flowing through the whole device. This leads to suppress intermittent turbulent vortex-like structures near the layer, and results in electron temperature and ion temperature rises surrounded by the layer having a localized bumped ambipolar potential Φ_c. The radial transport barrier is explained by the formation of a strong E_r shear or peaked vorticity W with the direction reversal of E_r×B sheared flow near the Φ_c peak for the turbulence suppression.5.Preliminary central ECH (170kW,20ms) in a standard tandem-mirror operation raises T_<eO> from 70 to 300 eV together with T_<i⊥O> from 4.5 to 6.1 keV, and T_<i//O> from 0.5 to 1.2 keV with τ_<pO>=95 ms for φ_c(=1.4 kV) trapped ions. The on-axis particle to energy confining ratio of τ_<pO>/τ_<EO> is observed to be 1.7 for φ_c trapped ions (consistent with Pastukhov's theory) and 2.4 for central mirror-trapped ions with 240-kW plug ECH and 90-kW ICH (η_<ICH>〜0.3;nl_c=4.5×10^<17>m^<-2>).