Optimization of Lower Hybrid Current Drive Efficiency for EAST Plasma with Non-Circular Cross Section and Finite Aspect-Ratio  

作　　者：侍行剑 胡业民 高喆 

机构地区：[1]Institute of Plasma Physics,Chinese Academy of Sciences [2]Center for Magnetic Fusion Theory,Chinese Academy of Sciences [3]Department of Engineering Physics,Tsinghua University

出　　处：《Plasma Science and Technology》2012年第3期215-221,共7页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China (Nos.10975156, 10990214);the fund from Ministry of Science and Technology of China (No.2009GB105002)

摘　　要：The two-dimensional equilibrium with flexible boundaries is solved via using a MAT- LAB Equilibrium Code （MEC）, which has applied the finite element method to handle the change- able plasma shape and employed the trust-region dogleg method to solve the nonlinear partial dif- ferential equation. The corresponding driven current profile is also calculated by coupling with the lower-hybrid simulation code （LSC）. The results are applied to optimize the lower hybrid current drive （LHCD） efficiency for the Experimental Advanced Superconductor Tokamak （EAST） and suggested that both elongation and triangularity have a notable effect on the efficiency because of the competition between the increase in the resonant area and in the Shafranov shift. Moreover, large aspect-ratio has a negative effect on the efficiency. These effects are studied numerically, which might be considered carefully for both good plasma confinement and high LHCD efficiency.The two-dimensional equilibrium with flexible boundaries is solved via using a MAT- LAB Equilibrium Code （MEC）, which has applied the finite element method to handle the change- able plasma shape and employed the trust-region dogleg method to solve the nonlinear partial dif- ferential equation. The corresponding driven current profile is also calculated by coupling with the lower-hybrid simulation code （LSC）. The results are applied to optimize the lower hybrid current drive （LHCD） efficiency for the Experimental Advanced Superconductor Tokamak （EAST） and suggested that both elongation and triangularity have a notable effect on the efficiency because of the competition between the increase in the resonant area and in the Shafranov shift. Moreover, large aspect-ratio has a negative effect on the efficiency. These effects are studied numerically, which might be considered carefully for both good plasma confinement and high LHCD efficiency.

关 键 词：EFFICIENCY LHCD ELONGATION triangularity ASPECT-RATIO 

分 类 号：TL631.24[核科学技术—核技术及应用] TN946.5[电子电信—信号与信息处理]