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国家教育部博士点基金(200800030037)

作品数:3 被引量:4H指数:1
相关作者:罗海云张然王新新朱鑫磊赵屾更多>>
相关机构:清华大学更多>>
发文基金:国家教育部博士点基金国家自然科学基金中国博士后科学基金更多>>
相关领域:理学核科学技术电子电信更多>>

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Determining the resistance of X-pinch plasma被引量:1
2013年
The current and the voltage of an X-pinch were measured. The inductance of the X-pinch was assumed to be a constant and estimated by the calculation of the magnetic field based on the well-known Biot–Savart’s Law. The voltage of the inductance was calculated with L · di/dt and subtracted from the measured voltage of the X-pinch. Then, the resistance of the X-pinch was determined and the following results were obtained. At the start of the current flow the resistance of the exploding wires is several tens of Ohms, one order of magnitude, higher than the metallic resistance of the wires at room temperature, and then it falls quickly to about 1 , which reflects the physical processes occurring in the electrically exploding wires, i.e., a current transition from the highly resistive wire core to the highly conductive plasma. It was shown that the inductive contribution to the voltage of the X-pinch is less than the resistive contribution. For the wires we used, the wires’ material and diameter have no strong influence on the resistance of the X-pinch, which may be explained by the fact that the current flows through the plasma rather than through the metallic wire itself. As a result, the current is almost equally divided between two parallel X-pinches even though the diameter and material of the wires used for these two X-pinches are significantly different.
赵屾薛创朱鑫磊张然罗海云邹晓兵王新新宁成丁宁束小建
关键词:X-PINCHZ-PINCH
小型X箍缩的初步实验研究被引量:1
2012年
基于一台紧凑型脉冲电流发生器,对小型X箍缩进行了初步的实验研究。当改变X箍缩双细丝的直径和材料时,流过负载的总电流几乎不变,这表明双细丝阻抗远小于负载的总阻抗。使用这些细丝,X箍缩均能辐射X射线,但随着细丝质量的增大,X射线辐射时刻相对于电流起始时刻的延迟逐渐增大,X射线脉冲通常为亚纳秒脉宽的单峰或几乎重叠的双峰。对于小质量的细丝负载,若驱动电流足够大,时常观察到时间间隔较长的两个X射线脉冲,并被确认为二次箍缩所致。
张然朱鑫磊罗海云赵屾邹晓兵王新新
关键词:Z箍缩
X-ray backlighting of two-wire Z-pinch plasma using X-pinch被引量:2
2010年
Two 50-μm Mo wires in parallel used as a Z-pinch load are electrically exploded with a pulsed current rising to 275 kA in 125 ns and their explosion processes are backlighted using an X-pinch as an x-ray source. The backlighting images show clearly the processes similar to those occurring in the initial stages of a cylindrical wire-array Z-pinch, including the electric explosion of single wires characterised by the dense wire cores surrounded by a low-density coronal plasma, the expansion of the exploding wire, the sausage instability (m = 0) in the coronal plasma around each wire, the motion of the coronal plasma as well as the wire core toward the current centroid, the formation of the precursor plasma column with a twist structure something like that of higher mode instability, especially the kink instability (m = 1).
赵彤邹晓兵张然王新新
关键词:X-PINCHZ-PINCH
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