电子回旋波在非圆截面托卡马克等离子体中的传播与功率沉积

Propagation and Power Deposition of Electron Cyclotron Waves in Non-circular Tokamak Plasmas

通过求解等离子体平衡方程、波迹方程和准线性Fokker-Planck方程,数值模拟了电子回旋(EC)波在非圆截面托卡马克等离子体中的传播轨迹和功率沉积。模拟结果表明:当EC波从顶部发射时,相比于圆截面的EC波波迹,非圆截面的波迹会向等离子体弱场侧偏移,增大等离子体中心电子密度,波迹也会偏向弱场侧,相应的波功率沉积有所降低;当EC波O模从中平面弱场侧发射时,随着平行折射率的增大,波迹弯曲幅度变大,增大到一定数值时会折回弱场侧穿出,波功率沉积随极向发射角的增大而降低,环向发射角约取10°时,波功率沉积达到最大。

With solving the plasma equilibrium equation,ray equations and quasi-linear Fokker-Planck equation,the ray trajectories and power deposition of EC wave were numerically simulated in non-circular HL-2ATokamak plasmas.The results show that when EC waves are launched from the top,the rays propagate towards the low-field side in non-circular plasma compared with the circular one,and the same effect occurs with increasing the central density of electrons,and the power deposition decreases accordingly.When the EC waves of ordinary mode are launched from the mid-plane and lowfield-side,ray trajectories are more bent as the parallel refractive index increases and even recurve to the low-field side when the parallel refractive index reaches a critical value.The power deposition decreases with increasing poloidal injection angle and reaches the maximum value when the toroidal injection angle is about 10 degree.