KTX双偏压电极运行放电改善实验研究  

Experimental study on discharge improvement of KTX with dual-biased electrodes

作　　者：蔡虎 邬佳仁 兰涛[1] 庄革[1] 毛文哲[1] 卫子安 温晓辉[1] 周楚[1] 刘阿娣 吴征威[1] 谢锦林[1] 刘万东[1] CAI Hu;WU Jia-ren;LAN Tao;ZHUANG Ge;MAO Wen-zhe;WEI Zi-an;WEN Xiao-hui;ZHOU Chu;LIU A-di;WU Zheng-wei;XIE Jin-lin;LIU Wan-dong(School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230011)

机构地区：[1]中国科学技术大学核科学与技术学院,合肥230022

出　　处：《核聚变与等离子体物理》2024年第4期429-435,共7页Nuclear Fusion and Plasma Physics

基　　金：国家磁约束核聚变能发展研究专项(2017YFE0301700,2017YFE0301701,2022YFE03100000);国家自然科学基金(11875255,11635008,11375188,11975231)。

摘　　要：研究了在KTX装置中的单偏压电极以及双偏压电极对环形等离子体约束特性的影响。实验发现偏压影响放电时长,通过调节偏压可以使得放电时长达到磁通极限;偏压电极改变放电时长的机制可能是通过改变边界E_(r)改变等离子体位移;实验还观测到施加偏压过程中等离子体电子密度有抬升的现象,并伴随电磁相干模出现。通过对涨落量引起的粒子输运通量频域展开,研究了偏压对粒子输运的影响,发现偏压增强电磁相干模频段涨落引起的粒子输运。The impact of single-bias and dual-bias electrodes on the confinement characteristics of a toroidal plasma in a KTX device was studied.The experiments found that bias voltage affects the discharge duration,and by adjusting the bias voltage,the discharge duration can reach the magnetic flux limit.The mechanism by which the bias electrode changes the discharge duration may be by changing the boundary radial electric field E_(r) and the plasma displacement.During the biasing,an increase of the plasma electron density was observed,accompanied the appearance of electromagnetic coherent modes.From the frequency resolved spectrum of the particle transport flux,the influence of biasing electrode on particle transport was studied,and it was found that the particle transport,caused by the fluctuation in the frequency range of the electromagnetic coherent mode,is enhanced.

关 键 词：偏压电极系统 运行放电改善 径向粒子输运 

分 类 号：TL631[核科学技术—核技术及应用]