超声分子束注入对J-TEXT装置等离子体边缘流和湍流的影响  

Influence of supersonic molecular beam injection on flows and turbulence in the edge plasmas on the J-TEXT tokamak

作　　者：谢耀禹 赵开君 张国书 杨州军[2] 陈志鹏 陈忠勇[2] 程钧 胡莹欣 温思宇 丁肖冠 任璐璐 李佳鑫 段龙 王璐 XIE Yaoyu;ZHAO Kaijun;ZHANG Guoshu;YANG Zhoujun;CHEN Zhipeng;CHEN Zhongyong;CHENG Jun;HU Yingxin;WEN Siyu;DING Xiaoguan;REN Lulu;LI Jiaxin;DUAN Long;WANG Lu(School of Nuclear Science and Engineer,East China University of Technology,Nanchang 330013,China;International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;School of Physical Science and Technology,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]东华理工大学核科学与工程学院,南昌330013 [2]华中科技大学电气与电子工程学院磁约束聚变与等离子体国际合作联合实验室,武汉430074 [3]西南交通大学物理科学与技术学院,成都610031

出　　处：《核技术》2025年第4期90-98,共9页Nuclear Techniques

基　　金：国家自然科学基金(No.12075057);江西省科技厅重点研发计划项目(No.20192ACB80006);江西省"双千"创新领军人才计划项目(No.DHSQT22021001)资助。

摘　　要：超声分子束注入是磁约束聚变装置常用的补充加料手段之一,并对等离子体流和湍流产生重要影响。实验在J-TEXT装置上开展,采用三台阶朗缪尔探针阵列,在欧姆放电氢等离子体中观测了超声分子束注入对边缘流和湍流的影响。结果表明:超声分子束注入后测地声模带状流、湍流及其驱动的粒子输运分别减小40%~60%、50%~70%及60%~70%,且伴随着离子-离子碰撞频率增大;湍流雷诺协强及湍流对测地声模带状流做功明显减小;密度及温度梯度降低。进一步分析表明,测地声模带状流减弱主要归因于湍流雷诺功的降低和碰撞率的增加;湍流减弱可能是密度、温度梯度降低的结果;湍流驱动的粒子输运减小可能来自径向速度涨落幅度下降。这些研究结果有助于对托卡马克等离子体湍流与输运的理解,并为未来ITER装置的运行提供参考。[Background]Supersonic molecular beam injection(SMBI)is a widely used auxiliary fueling method in magnetic confinement devices,significantly influencing plasma flows and turbulence.[Purpose]This study aims to investigate the effects of SMBI on flows and turbulence in the edge plasma of a tokamak.[Methods]The experiment was conducted on the J-TEXT tokamak with a major radius of 1.05 m and a minor radius of 0.255 m.The SMBI was injected into the vacuum through one of the bottom ports.A three-step Langmuir probe array was mounted on the top of the tokamak and was employed to measure and analyze edge plasma flows and turbulence with SMBI injection.Particular attention was given to geodesic acoustic mode(GAM)zonal flows,ion-ion collision frequency,turbulent Reynolds works,gradients,and turbulence-driven particle flux.[Results]Results indicate that the GAM,turbulence,and turbulent particle flux are suppressed after SMBI for 40%~60%,50%~70%,and 60%~70%,respectively,accompanying the increase in ion-ion collision frequency,and the decrease in turbulent Reynolds stress and the turbulent Reynolds work.[Conclusions]The suppression of GAM is related to the decrease in the nonlinear driving from turbulence and the increase in collision frequency;the decrease in turbulence may be the result of the flattening of density and temperature gradients;and the reduction of turbulent heat flux may come from the drop in the fluctuations of radial velocities.

关 键 词：托卡马克 超声分子束注入 边缘流和湍流 朗缪尔探针 

分 类 号：TL6[核科学技术—核技术及应用]