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Control of electron internal transport barriers in TCV

机译:TCV中电子内部传输壁垒的控制

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Current profile tailoring has been performed by application of electron cyclotron heating (ECH) and electron cyclotron current drive, leading to improved energy confinement in the plasma core of the TCV tokamak. The improved confinement is characterized by a substantial enhancement (H-factor) of the global electron energy confinement time relative to the prediction of the RLW scaling law (Rebut P H et al 1989 Proc. 12th Int. Conf. of Plasma Physics and Controlled Fusion Research (Nice, 1988) vol 2 (Vienna: IAEA) p 191), which predicts well Ohmic and standard ECH discharges on TCV. The improved confinement is attributed to a hollow current density profile producing a reversed shear profile creating an electron internal transport barrier. We relate the strength of the barrier to the depth of the hollow current density profile and the volume enclosed by the radial location of the peak current density. The rho(T)(*) (Tresset G et al 2002 Nucl. Fusion 42 520) criterion is used to evaluate the performance of the barrier relative to changes in the ECH parameters or the addition of Ohmic current, which aid in identifying the control parameters available for improving either the strength or volume of the barrier for enhanced performance. A figure of merit for the global scaling factor is used that scales the confinement enhancement as the product of the barrier volume and strength.
机译:通过应用电子回旋加速器(ECH)和电子回旋加速器电流驱动来进行电流分布调整,从而改善了TCV托卡马克等离子体中心的能量限制。相对于RLW比例定律的预测,改进的约束的特征在于全局电子能量约束时间的显着增加(H因子)(Rebut PH等人,1989年,《等离子体物理和受控聚变研究》,第12届国际学术会议)。 (Nice,1988)第2卷(维也纳:IAEA),第191页),预测TCV上的欧姆和标准EC​​H放电良好。改善的限制归因于产生反向剪切曲线的空心电流密度曲线,从而产生了电子内部传输势垒。我们将势垒的强度与空心电流密度分布的深度以及峰值电流密度的径向位置所包围的体积相关联。 rho(T)(*)(Tresset G等人,2002 Nucl。Fusion 42520)标准用于评估势垒相对于ECH参数的变化或欧姆电流的增加的性能,这有助于识别控制可用于改善屏障强度或体积以增强性能的参数。使用了全局缩放因子的品质因数,该缩放因子将缩放增强缩放为屏障体积和强度的乘积。

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