Origin of the B-dot jump observed in precision liner experiments

H. Lee, J. Stokes, W. Broste
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引用次数: 3

Abstract

In the liner-ejecta experiments carried out at the Los Alamos pulsed power facility Pegasus II, a solid liner was magnetically imploded to impact on a target cylinder to produce the shock-induced ejecta. As a result of improved time resolution for the B-dot (dB/dt) probes fielded last fall, the authors began to notice a sharp jump in the B-dot curve occurring at a time very close to the expected liner-target collision time. This jump was also found in the time derivative of the calculated current (dI/dt) obtained from code simulation. They have shown that the jump is indeed caused by the collision as a sudden change of the liner velocity would induce a sudden jump in the time derivative of the inductance. They have derived a general formula for calculating the jump in dI/dt and verified that the result computed from it is in good agreement with the code simulation. Useful diagnostic applications of the B-dot jump are discussed.
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精密直线实验中观测到的b点跳变的起源
在洛斯阿拉莫斯脉冲动力设施Pegasus II进行的衬垫弹射实验中,一个固体衬垫被磁内爆撞击目标圆柱体以产生激波诱导弹射。由于去年秋天部署的b点(dB/dt)探测器的时间分辨率有所提高,作者开始注意到b点曲线在非常接近预期的线性-目标碰撞时间的时候出现了急剧的跳跃。从代码模拟得到的计算电流(dI/dt)的时间导数中也发现了这种跳跃。他们已经证明,跳跃确实是由碰撞引起的,因为直线速度的突然变化会引起电感的时间导数的突然跳跃。他们推导了计算dI/dt跳变的一般公式,并验证了由此计算的结果与代码模拟的结果很好地吻合。讨论了b点跳变的诊断应用。
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