炸药柱面内爆磁通量压缩实验技术研究

炸药柱面内爆磁通量压缩实验技术 (MC-1) 是一种原理独特的高能量密度实验技术, 它是利用炸药内爆驱动金属套筒压缩其内部磁通量从而实现超高磁场, 利用超高磁场可以对其内部的样品实现等熵压缩. 由于这项技术具有超高磁场、等熵加载等特点, 在材料高压物性、新材料高压合成、及超强磁场下的凝聚态物理等多个领域都具有广阔的应用前景. 2011年, 中物院流体物理研究所在国内率先开展了这一方面的实验研究工作, 研制成功了单级MC-1实验装置, 观测到了MC-1实验的典型实验特征, 获得了超过430T的动态超强磁场. 数值分析表明, 利用这项技术可以实现对材料的等熵压缩. 这项技术的研究对于我国未来开展极端条件下的凝聚态物理研究具有积极的意义. 关键词： 柱面内爆 磁通量压缩 等熵压缩 超强磁场

Experimental research on the technique of magnetic flux compression by explosive cylindrical implosion

The cylindrical magnetic flux compression by explosive implosion (MC-1) is a kind of unique high energy density dynamic technique. A metal cylinder was driven by explosive implosion to compress the primary magnetic flux inside and an ultrahigh magnetic field was realized, which could be used to achieve effective isentropic compression of the sample. This technique has anigue characters like ultrahigh isentropic pressure and ultrahigh magnetic field, and would find wide usage in areas like high pressure physics, new material synthesis and ultrahigh magnetic field physics. The Institute of Fluid Physics, Chinese Academy of Engineering Physics (IFP, CAEP) has begun to make experiments on MC-1 since 2011 and a one-stage MC-1 set-up has been built up. The primary experimental results including the movement of liner and typical "turn-around" character in MC-1 experiment were observed and recorded. In the experiment a dynamic magnetic field of about 430T was obtained. The MC-1 process was numerically simulated by the one-dimensional MHD code and the simulations are in accord with experiments. Numerical simulations show that this technique has advantages in isentropic compression of materials as compared with normal implosion experiment.
Keywords： cylindrical implosion magnetic flux compression isentropic compression ultrahigh magnetic field