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首页> 外文期刊>Plasma physics and controlled fusion >Plasma horizontal position control for the J-TEXT tokamak based on feedforward density compensation
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Plasma horizontal position control for the J-TEXT tokamak based on feedforward density compensation

机译：基于前馈密度补偿的J-TEXT托卡马克等离子水平位置控制

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摘要

A relationship of the vertical field B_z required to maintain horizontal stability and the ratio of the central line-averaged density to the plasma current n_e/I_p is deduced and is proved to be linear through the previous statistical discharge data on the J-TEXT tokamak. According to this, a plasma horizontal position control system based on feedforward density compensation (FDC) is developed and tested on the machine for different ramping rates of density variation. Due to the feedforward density signal, the controller with FDC could suppress the disturbance of the horizontal displacement owing to the density variation during the flat-top phase moving more quickly when compared with the case with the traditional proportional-integral-derivative controller, which is a feedback controller. There is a trade-off between the suppression of the perturbation and the oscillation of the horizontal displacement for density variation, which should be taken into account in real routine discharge.
机译：推论出维持水平稳定性所需的垂直场B_z与中心线平均密度与等离子体电流n_e / I_p之比的关系，并通过J-TEXT托卡马克上的先前统计放电数据证明是线性的。据此，开发了基于前馈密度补偿（FDC）的等离子水平位置控制系统，并在该机器上针对密度变化的不同斜率进行了测试。由于具有前馈密度信号，与传统的比例积分微分控制器相比，具有FDC的控制器可以抑制由于平顶相位移动期间的密度变化而导致的水平位移干扰，该方法与传统的比例积分微分控制器相比反馈控制器。在抑制扰动和改变密度的水平位移的振荡之间要进行权衡，这在实际的常规排放中应予以考虑。

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