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Investigation of 1-MA, 200-ns Ar Gas Puff Z-Pinches on COBRA*

机译:在COBRA *上研究1-MA,200 ns Ar气吹Z型捏

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We have conducted Ar gas puff z-pinch studies on the COBRA generator. A triple-nozzle is used to produce tailored gas density distributions with two concentric annular nozzles and a center gas jet. We report suppression of Rayleigh-Taylor instabilities by inner dense plasmas, and photo-ionization of the inner gas puffs by the hot outer imploding plasma. By varying the initial gas density profiles, we have optimized the Ar K-shell x-ray radiation, and produced stable 200-ns implosions. Various diagnostics are used in these experiments, including: Planar Laser Induced Fluorescence (PLIF) to determine the initial gas puff mass density profile; an X-ray streak camera for imploding plasma radius; a three-frame laser shearing Interferometer (LSI) for imploding plasma sheath structure and/or density profiles, two four-frame gated extreme UV(XUV) cameras to capture the imploding plasma shapes; and multi-channel, filtered pinhole X-ray cameras to image the pinch plasma. Also, the Ar K-shell X-ray, XUV and radially resolved visible spectra are recorded by mica crystal, 1-m grazing-incidence, and fiber optic coupled spectrometers, respectively. Detailed analysis of the results will be presented.
机译:我们已经在COBRA发生器上进行了Ar气吹z捏研究。一个三喷嘴用于通过两个同心环形喷嘴和一个中心气体喷嘴产生定制的气体密度分布。我们报告通过内部密集的等离子体抑制瑞利-泰勒不稳定性,并通过热的外部爆破等离子体对内部气体的抽吸进行电离。通过改变初始气体密度分布,我们优化了Ar K壳x射线辐射,并产生了稳定的200 ns内爆。这些实验中使用了各种诊断方法,包括:平面激光诱导荧光(PLIF),用于确定初始气体抽吸质量密度分布;以及X射线条纹照相机,用于爆破等离子体半径;用于内爆等离子体鞘结构和/或密度分布图的三帧激光剪切干涉仪(LSI),两个四帧门控极紫外(XUV)摄像机以捕获内爆等离子体形状;以及经过过滤的多通道针孔X射线照相机,以对收缩等离子体成像。此外,分别通过云母晶体,1-m掠入射和光纤耦合光谱仪记录Ar K壳X射线,XUV和径向分辨的可见光谱。将对结果进行详细分析。

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