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Mechanism of central temperature peaking in impurity seeded plasmas

机译：杂质晶种等离子体中的中心温度峰化机理

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Formation of a centrally peaked profile of the ion temperature by impurity seeding has been observed in all the largest tokamaks: JET, JT-60U, TFTR. A possible explanation of this phenomenon is proposed, which takes into account the suppression of ion temperature gradient instability induced anomalous transport through increasing ion effective charge Z(eff) and Doppler shift of unstable modes, S-perpendicular to. The particular importance of the S-perpendicular to component proportional to the temperature gradient, which stems from the pressure gradient and neoclassical poloidal rotation, is elucidated. It is demonstrated that this contribution grows significantly by impurity seeding when the rotation regime changes due to increased collisionality. An interrelation between the heating power density and Z(eff) necessary for the transition to a peaked ion temperature is found. The modification of radial profiles by impurity seeding is modelled numerically and the results are in agreement with the experimental data from JET. [References: 29]
机译：在所有最大的托卡马克机种：JET，JT-60U和TFTR中，都观察到了通过杂质注入形成的离子温度中心峰值曲线。提出了对此现象的可能解释，其中考虑到通过增加离子有效电荷Z（eff）和S垂直于S的不稳定模式的多普勒频移来抑制离子温度梯度不稳定性引起的异常传输。阐明了S垂直于与温度梯度成比例的分量的特殊重要性，这源于压力梯度和新古典的极向旋转。结果表明，当旋转状态由于碰撞性增加而发生变化时，杂质注入会大大增加这一贡献。发现转变为峰值离子温度所需的加热功率密度和Z（eff）之间的相互关系。数值模拟了杂质注入对径向轮廓的修改，其结果与JET的实验数据相符。 [参考：29]

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