低杂波控制电流分布与改善约束研究

在HT-7超导托卡马克装置上利用低杂波电流驱动有效地控制了等离子体电流分布,并使等离子体约束性能改善。数值模拟与硬X射线测量结果均表明,低杂波的发射功率谱、纵场和等离子体密度对改变等离子体电流分布有明显的影响。在优化低杂波电流驱动实验参数的条件下,等离子体密度、温度分布发生了理想的变化。在电子和离子温度分布上出现了内部输运垒,同时等离子体的能量约束时间和粒子约束时间均有提高。

Study of current profile control and improved confinement with lower hybrid current drive in the HT-7 tokamak

The effectiveness of the plasma current profile control and confinement improvement with lower hybrid current drive (LHCD) in the HT-7 superconducting tokamak has been observed successfully. Numerical simulations and hard X-ray evolution spectra indicate that the power spectrum of lower hybrid wave, toroidal magnetic field and plasma density are the key factors for changing the plasma current profile. In the optimal LHCD condition, profiles of plasma density and temperatures have been changed as expected. And the internal transport barriers have appeared in the profiles of both electron and ion temperatures. Both the energy confinement time and the particle confinement time have been improved.