Multi frame synchrotron radiography of pulsed power driven underwater single wire explosions
Multi frame synchrotron radiography of pulsed power driven underwater single wire explosions
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DOI：
10.1063/1.5047204
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发表时间：
2018-10
影响因子：
3.2
通讯作者：
D. Yanuka;A. Rososhek;S. Theocharous;S. Bland;Y. Krasik;M. Olbinado;A. Rack
中科院分区：
文献类型：
--
作者：
D. Yanuka;A. Rososhek;S. Theocharous;S. Bland;Y. Krasik;M. Olbinado;A. Rack
我们首次使用基于同步加速器的相衬射线照相技术来研究脉冲功率驱动的高能量密度物理实验。水下电线爆炸已引起更广泛的物理学界的兴趣，因为它们能够研究极端条件下的材料特性，并有效地将存储的电能耦合到水中的强烈冲击波中。后者可以成形为提供会聚内爆，从而在相对较小的脉冲电力设施（数百 kA-MA）上产生非常高的压力（1-10 Mbar）。多个实验探索了水中的单线爆炸，希望了解底层物理原理并更好地优化这种能量传递过程；然而，诊断可能受到限制。光学成像诊断通常会被冲击波本身所掩盖。到目前为止，基于二极管的 X 射线照相技术的分辨率相对较低，但 X 射线能谱相当宽。利用欧洲同步辐射设施 ID19 光束线的相衬成像功能，我们能够对爆炸线和冲击波进行成像。在直径约 2 厘米的水筒中探测 20-50 keV 射线照射的 200 微米钨丝和铜丝，分辨率为 8 微米和 32 微米。这些电线被～30 kA、500 ns 紧凑型脉冲发生器爆炸，并在每个实验中拍摄了 128 张射线照片，每张射线照片都有 100 ps X 射线脉冲曝光，间隔为 704 ns。使用阿贝尔反演来获得线的密度分布，并将结果与二维流体动力学和一维磁流体动力学模拟进行比较。我们首次使用基于同步加速器的相衬射线照相术来研究脉冲功率驱动的高能量密度物理实验。水下电线爆炸已引起更广泛的物理学界的兴趣，因为它们能够研究极端条件下的材料特性，并有效地将存储的电能耦合到水中的强烈冲击波中。后者可以成形为提供会聚内爆，从而在相对较小的脉冲电力设施（数百 kA-MA）上产生非常高的压力（1-10 Mbar）。多个实验探索了水中的单线爆炸，希望了解底层物理原理并更好地优化这种能量传递过程；然而，诊断可能受到限制。光学成像诊断通常会被冲击波本身所掩盖。到目前为止，基于二极管的 X 射线照相技术的分辨率相对较低，但 X 射线能谱相当宽。利用 ID1 的相差成像功能...
We present the first use of synchrotron-based phase contrast radiography to study pulsed-power driven high energy density physics experiments. Underwater electrical wire explosions have become of interest to the wider physics community due to their ability to study material properties at extreme conditions and efficiently couple stored electrical energy into intense shock waves in water. The latter can be shaped to provide convergent implosions, resulting in very high pressures (1-10 Mbar) produced on relatively small pulsed power facilities (100s of kA-MA). Multiple experiments have explored single-wire explosions in water, hoping to understand the underlying physics and better optimize this energy transfer process; however, diagnostics can be limited. Optical imaging diagnostics are usually obscured by the shock wave itself; and until now, diode-based X-ray radiography has been of relatively low resolution and rather a broad x-ray energy spectrum. Utilising phase contrast imaging capabilities of the ID19 beamline at the European Synchrotron Radiation Facility, we were able to image both the exploding wire and the shock wave. Probing radiation of 20-50 keV radiographed 200 μm tungsten and copper wires, in ∼2-cm diameter water cylinders with resolutions of 8 μm and 32 μm. The wires were exploded by a ∼30-kA, 500-ns compact pulser, and 128 radiographs, each with a 100-ps X-ray pulse exposure, spaced at 704 ns apart were taken in each experiment. Abel inversion was used to obtain the density profile of the wires, and the results are compared to two dimensional hydrodynamic and one dimensional magnetohydrodynamic simulations.We present the first use of synchrotron-based phase contrast radiography to study pulsed-power driven high energy density physics experiments. Underwater electrical wire explosions have become of interest to the wider physics community due to their ability to study material properties at extreme conditions and efficiently couple stored electrical energy into intense shock waves in water. The latter can be shaped to provide convergent implosions, resulting in very high pressures (1-10 Mbar) produced on relatively small pulsed power facilities (100s of kA-MA). Multiple experiments have explored single-wire explosions in water, hoping to understand the underlying physics and better optimize this energy transfer process; however, diagnostics can be limited. Optical imaging diagnostics are usually obscured by the shock wave itself; and until now, diode-based X-ray radiography has been of relatively low resolution and rather a broad x-ray energy spectrum. Utilising phase contrast imaging capabilities of the ID1...