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Optimization of Double-Wire X-pinch Using Prepulse Current

Physics of plasmas(2023)SCI 3区

Xi An Jiao Tong Univ

Cited 1|Views1
Abstract
The radiation properties including size, intensity, and pulse width of the double-wire X-pinch were optimized using prepulse current. The optimization mechanism was investigated using optical diagnostics. The X-pinch driven by a current with a peak intensity of ∼250 kA and a rise rate of 0.95 kA/ns was difficult to produce strong radiation. The application of prepulse effectively enhances the current rise rate and intensity of the radiation source. The radiation source also exhibited reduced spatial dimensions and radiation duration, thereby improving spatial and temporal resolution while used in x-ray projection shadow radiography. The magnetic field and current distribution were measured using Faraday rotation. During the early stage, the current predominantly flows in the corona plasma at a larger radius generated by the prepulse current, consequently reducing the load inductance. As the time delay between the main and prepulse current increased, the intensity of the radiation source further increased. This study provides an approach for controlling radiation sources and enables different applications of X-pinches with adjustable prepulse current.
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要点】:本文研究了利用预脉冲电流优化双线X pinch的辐射特性,提高了X pinch的辐射强度、减小了辐射尺寸并缩短了辐射持续时间,从而增强了X射线投影阴影成像的时空分辨率。

方法】:通过光学诊断技术研究了预脉冲电流对X pinch辐射特性的影响,并利用法拉第旋转技术测量了磁场和电流分布。

实验】:实验采用了一个峰值为250 kA、上升率为0.95 kA/ns的电流驱动X pinch,通过加入预脉冲电流增强了辐射源的电流上升率和强度,并使用Faraday rotation技术测量了相关物理量,结果表明随着主脉冲与预脉冲电流时间延迟的增加,辐射源强度进一步增加。数据集名称在文中未明确提及。