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首页> 外文期刊>Plasma physics and controlled fusion >Effect of hysteresis in JET ITB plasma with LHCD
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Effect of hysteresis in JET ITB plasma with LHCD

机译：LHCD对JET ITB血浆的磁滞效应

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A strong ITB was sustained in a reversed shear discharge in JET during a long time interval after a significant reduction in plasma heating power. The observed ITB evolution is reminiscent of the effect of hysteresis, associated in theory with turbulence suppression due to shear of the plasma rotation. The mechanism of ITB sustainment was analysed. Modelling of the plasma heating and current profile was done using the TRANSP and JETTO transport codes. The resulting q-profile evolution was verified by comparison with the pitch angle delta = B-p/B-t deduced from motional Stark effect measurements (where B-p and B-t are the poloidal and toroidal magnetic field, respectively). Turbulence stability was analysed using the gyro-kinetic code Kinezero. It was shown that the strong negative magnetic shear produced by LHCD and sustained mainly by the bootstrap current in the plasma core is responsible for the turbulence stabilization. Stabilization due to shear of the plasma rotation and finite beta-stabilization play a complimentary role. The effect of bootstrap and LH driven currents on magnetic shear in JET discharges was analysed.
机译：在等离子加热功率显着降低之后的很长一段时间内，JET的反向剪切放电中维持了强大的ITB。观察到的ITB演变使人联想到磁滞效应，理论上由于等离子旋转的剪切而与湍流抑制相关。分析了ITB的维持机制。使用TRANSP和JETTO传输代码对等离子体加热和电流分布进行建模。通过与从运动斯塔克效应测量得出的俯仰角delta = B-p / B-t（其中B-p和B-t分别是多极磁场和环形磁场）进行比较，验证了所产生的q轮廓演变。使用陀螺动力学代码Kinezero分析了湍流稳定性。结果表明，LHCD产生的强负磁剪切力主要由等离子芯中的自举电流维持，这是湍流稳定的原因。由于等离子旋转的剪切而引起的稳定和有限的β稳定起着互补的作用。分析了自举和LH驱动电流对JET放电中的磁剪切的影响。

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