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Violation of the Mercier criterion in reversed shear confinement configurations in tokamaks

机译:托卡马克的反向剪切约束构型违反Mercier准则

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It is found that the Mercier criterion can be violated in a reversed sheer plasma of a tokamak. A reversed shear plasma has negative magnetic shear and negative pressure gradient in the inner region of a plasma. In the negative shear region, stabilizing terms due to the parallel current and the magnetic well produced by the poloidal current change to destabilizing ones. As (q(0)-q(min))/q(min) increases, the destabilizing effects increase and the Mercier criterion can be violated. Here, q(0) and q(min) are the safety factor on the plasma axis and the minimum value along the minor radius, respectively. In JT-60U reversed shear plasmas, the value of (q(0)-q(min))/q(min) becomes large. The violation of the Mercier criterion seems to be consistent with the observation of magnetohydrodynamic activity localized near the internal transport barrier. [References: 14]
机译:发现在托卡马克的反向纯粹血浆中可以违反Mercier准则。反向剪切等离子体在等离子体的内部区域具有负磁剪切和负压力梯度。在负剪切区域,由于平行电流和由倍性电流产生的磁阱而产生的稳定项变为不稳定项。随着(q(0)-q(min))/ q(min)的增加,去稳定效果增加,并且可能违反Mercier准则。此处,q(0)和q(min)分别是等离子轴上的安全系数和沿短半径的最小值。在JT-60U反向剪切等离子体中,(q(0)-q(min))/ q(min)的值变大。违反Mercier标准似乎与观察到内部运输壁垒附近的磁流体动力活动一致。 [参考:14]

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