HT-7超导托卡马克调制电流改善等离子体约束

 在HT-7超导托卡马克上进行了电流调制改善等离子体约束物理实验，获得了初步的实验结果。对电流调制时的径向电场进行了数值计算和讨论。当等离子体环向电流以适当的频率和幅值周期性调制时，低模数的磁流体不稳定性得到明显的抑制，等离子体中心电子温度增加了33%，等离子体电子密度分布明显陡化，能量约束时间增加了27%~45%。杂质辐射周期性减少,粒子约束时间增加了2倍。在等离子体边界产生更强的径向负电场。

Improved plasma confinement by modulated toroidal current on HT-7 superconducting Tokamak

The improved confinement phase was observed during modulating toroidal current on the Hefei superconducting Tokamak-7 (HT-7 ). This improved plasma confinement phase is characterized by suppressing magnetohydrodynamic (MHD) instabilities effectively thus increased the central line averaged electron density and the central electron temperature about 33%, output steeper density profiles, and reduced hydrogen radiation from the edge as well. The global energy confinement time was increased by 27%～45%;The impurity radiation was reduced by modulation of plasma toroidal current;Particle confinement time was increased about two times;A more strong radial negative electric field formed inside the limiter. The radial electric field during modulating current was calculated and disscussed.