Mao Aohua, Ma Xun, E Peng, Guan Jian, Ling Wenbin, Li Liyi, Li Hongtao
Laboratory for Space Environment and Physical Sciences, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China.
Key Laboratory of Pulsed Power, Institute of Fluid Physics, CAEP, Mianyang 621900, Sichuan, China.
Rev Sci Instrum. 2020 Aug 1;91(8):084702. doi: 10.1063/5.0011711.
The Space Plasma Environment Research Facility (SPERF) is a new ground-based experimental device for fundamental research studies on space plasma currently under construction at Harbin Institute of Technology in China. Scientific objectives of the SPERF include studying the asymmetric reconnection dynamics relevant to the interaction between the interplanetary and magnetospheric plasmas, reproducing the inner magnetosphere to simulate the processes of trapping, acceleration, and transport of energetic charged particles restrained in a dipole magnetic field configuration, and revealing the physical mechanism of the dipolarization front in the magnetotail. The device comprises a vacuum chamber, 11 coils consisting of 18 groups of sub-coils that are independently programmablely energized, and the plasma source system to provide the magnetic field and the plasma required by the physical experiments. Thus, each of these 18 groups of sub-coils requires a separate pulsed power supply; furthermore, the 18 pulsed power supplies constitute the pulsed power supply system of the SPERF of which the total storage energy is up to 18.3 MJ, and the technical challenges have to be overcome. The power supply energizing a dipole field coil (labeled OJC coil) wired by the copper wire to provide a dipole magnetic field is the most energetic power supply (labeled OJC power supply) with a 2.42 MJ, 16.8 mF capacitor bank charged to 20 kV. The OJC power supply delivers a current with a peak of 18 kA for a rise time of ∼26.69 ms, and the duration of the current is not less than 95% of the peak over 10 ms to the OJC coil. Meanwhile, the most challenging power supply is the power supply labeled poloidal field power supply with a 5.04 mF capacitor bank charged to 20 kV, which provides the excitation current for the load coil set with the current not less than 360 kA at the typical time of 0.11 ms to produce the sufficient growth of the magnetic field that the experiments need. In this paper, the overall design of the pulsed power supply system, the design concept of the modularization, and the principle selection basis of the key components are presented. The technical details of each power supply will be demonstrated in the future.
空间等离子体环境研究设施（SPERF）是中国哈尔滨工业大学目前正在建造的用于空间等离子体基础研究的新型地面实验装置。SPERF的科学目标包括研究与行星际和磁层等离子体相互作用相关的不对称重联动力学，重现内磁层以模拟在偶极磁场配置中被俘获、加速和传输的高能带电粒子的过程，以及揭示磁尾中偶极化前沿的物理机制。该装置包括一个真空室、由18组子线圈组成的11个线圈，这些子线圈可独立编程通电，以及等离子体源系统，以提供物理实验所需的磁场和等离子体。因此，这18组子线圈中的每组都需要一个单独的脉冲电源；此外，这18个脉冲电源构成了SPERF的脉冲电源系统，其总储能高达18.3 MJ，必须克服技术挑战。为用铜线绕制以提供偶极磁场的偶极场线圈（标记为OJC线圈）供电的电源是能量最高的电源（标记为OJC电源），它有一个2.42 MJ、16.8 mF的电容器组，充电至20 kV。OJC电源在约26.69 ms的上升时间内提供峰值为18 kA的电流，并且电流持续时间在10 ms内不小于峰值的95%，输送至OJC线圈。同时，最具挑战性的电源是标记为极向场电源的电源，它有一个5.04 mF的电容器组，充电至20 kV，在典型的0.11 ms时间内为负载线圈组提供励磁电流，电流不小于360 kA，以产生实验所需的足够磁场增长。本文介绍了脉冲电源系统的总体设计、模块化设计理念以及关键部件的原理选择依据。每个电源的技术细节将在未来展示。
