Lin Munan, Liu Ming, Zhu Guanghui, Shi Peiyun, Zheng Jian, Lu Quanming, Sun Xuan
Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China.
CAS Key Laboratory of Geospace Environment, No. 96, JinZhai Road Baohe District, 230026 Hefei, China.
Rev Sci Instrum. 2017 Sep;88(9):093505. doi: 10.1063/1.5001313.
We describe a field reversed configuration (FRC) experiment featuring in-vessel θ-pinch coils and open-field-line plasmas confined in a tandem mirror. Two FRCs, formed near the west and the east mirror throats of a central cell, are ejected toward the mid-plane for colliding and merging. Each FRC consists of four groups of pulsed power supplies and four groups of coils, having diameters 35, 35, 40, and 45 cm. The rise time of the main reversal field is 7.15 μs, and the maximum voltage is 40 kV with total currents of 416 kA, corresponding to a magnetic field of 1690 G. The total capacitive stored energy is 115.2 kJ. A fast pulse gas injection system was designed and tested to inject neutral gas into the FRC formation region with controlled directions. The successful installation of the θ-pinch coils inside the vacuum vessel offers greater freedom for diagnostics and control instruments as well as preserving magnetic tandem mirror configuration. The magnetic field reversal is confirmed by internal magnetic field measurements. The plasma temperature, density, and lifetime are, respectively, ∼100 eV, ∼3.0 × 10 m, and ∼300 μs for the current operating conditions.
我们描述了一个场反向配置（FRC）实验，该实验具有容器内θ箍缩线圈以及限制在串联磁镜中的开放磁力线等离子体。在中央单元的西部和东部磁镜喉部附近形成的两个FRC被朝中间平面喷射以进行碰撞和合并。每个FRC由四组脉冲电源和四组线圈组成，其直径分别为35、35、40和45厘米。主反向场的上升时间为7.15微秒，最大电压为40 kV，总电流为416 kA，对应磁场为1690 G。总电容存储能量为115.2 kJ。设计并测试了一个快速脉冲气体注入系统，以将中性气体沿受控方向注入FRC形成区域。真空容器内θ箍缩线圈的成功安装为诊断和控制仪器提供了更大的自由度，同时保留了磁串联磁镜配置。通过内部磁场测量确认了磁场反转。对于当前的运行条件，等离子体温度、密度和寿命分别约为100 eV、约3.0×10米和约300微秒。
