Experiment study of cascades explosive implosion magnetic flux generator
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摘要: 柱面内爆磁通量压缩发生器是利用炸药内爆压缩其内部磁通量至轴线附近小体积内从而实现超高磁场，传统的单级装置因受到金属套筒内爆失稳等影响性能指标受限。开展了多级内爆磁压缩技术研究，突破多项关键技术，包括研制特殊结构的密绕螺线管、脉冲功率源及大电流放电开关等，具备在直径135 mm套筒空间内实现20 T以上初始磁场产生能力，并建立了动态磁光测量系统。利用磁流体力学编码SSS-MHD开展多级装置设计，计算显示，设计的多级装置能够将约42%的初始磁通量压缩至轴线附近直径7 mm的空间内。最终研制成功多级内爆磁压缩装置CJ-150，在亚立方厘米以上空间实现轴向峰值磁场强度906 T，数据不确定度5.35%。10余发动态考核实验显示，CJ-150装置工作稳定，能够满足物理实验需要。利用经实验验证的磁流体模型计算显示，CJ-150具备1000 T以上超强磁场产生能力，能够对大尺寸样品实现500 GPa以上的准等熵加载。Abstract: The explosive implosion magnetic flux generator (EIMFG) could realize ultrahigh magnetic field by using explosive implosion to compress and cumulate inner magnetic flux into a smaller volume near axis. The EIMFG was designed by using magneto-hydrodynamics code of SSS-MHD and simulation shown that around 42% of initial magnetic flux would be finally compressed and cumulated into a volume of 7 mm in diameter near axis. The initial magnetic field system including specific solenoid, power source and large current switch was built up and had the ability of over 20 T of initial magnetic field producing in a cylinder space of 135 mm in diameter. A magnetic optical measurement system was also built up and suitable to dynamic detonation environment. Finally, a 20 kg TNT explosive sale EIMFG setup named CJ-150 was built up and axial maximum magnetic field up to 906 T was recorded using Faraday optical method. The original magneto-optical signal was clear with high quality, and uncertainty of maximum magnetic field data was 5.35%. The magnetic loading by Lorenz force was proved isentropic and uniform around from the measurement results of photonic Doppler velocimeter (PDV) probes which were set inside the sample tube. The CJ-150 setup is proved working stably and suitable to be used in physics experiment. Analysis show that CJ-150 could produce over 1000 T of ultrahigh magnetic field in over 10-1 cm3 volume and realize over 500 GPa of ultrahigh isentropic compression on large size sample.
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图 4 三级磁通量压缩一维MHD计算模型（单位：mm）
Figure 4. 1-D MHD simulation model of cascades magnetic flux cumulation (unit: mm)
图 5 轴心区域磁通量汇聚历史（计算结果）
Figure 5. Magnetic flux cumulation history at axial area, obtained from simulation
图 6 轴心空腔区域及相邻套筒铜线层区域磁场分布
Figure 6. The magnetic field distribution in the axial cavity and adjacent copper wires layer
图 7 三级套筒运动轨迹及压缩磁场波形
Figure 7. The 3 liners movement trajectories and magnetic field profiles
图 8 第3级套筒铜线层区域压力分布
Figure 8. The pressure distribution in the third liner copper wires layer
图 10 密绕螺线管结构（左）及第2级套筒示意图（右）
Figure 10. The close-wound solenoid structure (left) and the second liner (right)
图 11 密绕螺线管线圈归一化磁场分布
Figure 11. The close-wound solenoid normalized magnetic field distribution
图 12 多层密绕螺线管线圈内磁通量和平均轴向磁场曲线
Figure 12. Magnetic flux inside of close-wound solenoid and average magnetic field
图 23 铜管内壁自由面速度及位移
Figure 23. Inner free surface velocity and displacement of copper tube
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