摘要
通过开展低杂波电流驱动效率与等离子体参数相关性研究,HT 7装置上的最大电流驱动效率达到ηCD=neRpIRF/PLH≈1.4×1019A·W-1·m-2。实验结果表明,优化低杂波的功率谱、等离子体密度、纵场等参数对提高驱动效率起到了关键作用。驱动效率对波谱、密度有较强的依赖性,波谱在Npeak‖=(2.45～2.9),密度为(1.5～2.0)×1013cm-3时驱动效率较高;驱动效率随着纵场的升高而增大;同时,改善托卡马克壁状态、降低杂质水平、提高放电稳定性,对提高驱动效率有积极作用。
Research of the relationship between the efficiency of lower hybrid current drive and plasma parameters has been carried out on the HT-7 superconducting tokamak.The highest current drive efficiency is η_CD=n_eR_pI_RF/P_LH≈1.4×10~19A·W^-1·m^-2?The experimental results show that the optimization of power spectrum,plasma density,toroidal magnetic field and impurity concentration are beneficial to the raise of the current drive efficiency.The current drive efficiency with these parameters has been studied.The dependence of η_CD on the spectrum and plasma density is very clear.A high η_CD can achieved when N^peak_‖=(2.45～2.9),and density are (1.5～2.0)×10~13cm^-3.It also has been seen that current drive efficiency increases with the increase of toroidal magnetic field.At the same time,good wall condition,lower impurity and stable discharge are beneficial to the current drive efficiency.
出处
《核聚变与等离子体物理》
CAS
CSCD
北大核心
2003年第4期224-228,共5页
Nuclear Fusion and Plasma Physics
基金
国家自然科学基金资助项目(19985005)
