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

高功率 ECH 形成径向剪切电场的等离子体约束的广义物理机制及新开发的等离子体稳定方法的验证

基本信息

批准号：
16360455
负责人：
CHO Teruji
金额：
$ 6.78万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

项目摘要

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>).

1.这些年来，在离子温度为几keV的热离子模式下，离子限制势高度（φ_c）取得了四倍的进步，随着插头电子回旋加热（ECH）功率，φ_c的缩放比例有利地增加.2.势形成的进展导致发现径向剪切电场对湍流抑制和横向损失减少具有显着效果。3.优选依赖于弱减小获得了密度增加到〜10^<19> m^<-3>的φ_c，以及随着插塞ECH功率的增加而恢复的φ_c。4.由势垒中的离轴ECH产生横向能量传输势垒首次反射镜，形成具有流过整个器件的高能电子的圆柱形层，这导致抑制该层附近的间歇性湍流涡旋状结构，并导致电子温度和离子温度升高，周围具有局部凸块双极电势 Φ_c 径向传输势垒可以通过在湍流的 Φ_c 峰值附近形成强 E_r 剪切或峰值涡度 W 以及 E_r×B 剪切流的方向反转来解释。 5.标准串联镜操作中的初步中央ECH（170kW，20ms）升高T_<eO> 从 70 到 300 eV，T_<i⊥O> 从 4.5 到 6.1 keV，T_<i//O> 从 0.5 到 1.2 keV，τ_<pO>=95 ms，对于 φ_c(=1.4 kV) ) 捕获的离子的轴上粒子与能量的限制比。对于 φ_c 捕获离子，观察到 τ_<pO>/τ_<EO> 为 1.7（与 Pastukhov 理论一致），对于具有 240 kW 插头 ECH 和 90 kW ICH 的中心镜捕获离子，τ_<pO>/τ_<EO> 为 2.4 (η_<ICH>〜0.3 ;nl_c=4.5×10^<17>m^<-2>)。