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IMPLOSION DYNAMICS, RADIATION CHARACTERISTICS, AND SPECTROSCOPIC MEASUREMENTS OF WIRE-ARRAY Z-PINCHES ON THE CORNELL BEAM RESEARCH ACCELERATOR (COBRA)

机译:柯尼尔射束研究加速器(COBRA)上的线状Z形夹点的内爆动力学,辐射特性和光谱测量

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摘要

This dissertation presents the results of two experimental studies of wire-array z-pinches on the 1-MA, 100-ns rise-time Cornell Beam Research Accelerator (COBRA).In the first study, results are presented which characterize the implosion dynamics and radiation output of wire array z-pinches on COBRA. Here the load geometries investigated include 10- and 20-mm tall cylindrical arrays ranging from 4 to 16 mm in diameter, and consisting of 8, 16, or 32 wires of either tungsten, aluminum, or Invar (64% iron, 36% nickel). Diagnostics fielded include an optical streak camera, a time-gated extreme-ultraviolet framing camera, a laser shadowgraph system, time-integrated pinhole cameras, an x-ray wide-band focusing spectrograph with spatial resolution, an x-ray streak camera, a load voltage monitor, a Faraday cup, a bolometer, silicon diodes, and diamond photoconducting detectors. The data produced by the entire suite of diagnostics are analyzed and presented to provide a detailed picture of the overall implosion process and resulting radiation output on COBRA. The highest x-ray peak powers (300--500 GW) and total energy yields (6--10 kJ) were obtained using 4-mm-diameter arrays that stagnated before peak current. Additional findings include a decrease in soft x-ray radiation prior to stagnation as the initial wire spacing was changed from 1.6 mm to 785 $mu$m, and a timing correlation between the onset of energetic electrons, hard x-ray generation, and the arrival of trailing current on axis---a correlation that is likely due to the formation of micro-pinches. The details of these and other findings are presented and discussed.In the second study, a new diagnostic setup was developed to record the visible-light spectra emitted from aluminum wire-array plasmas as a continuous function of time. To accomplish this, a half-meter Czerny-Turner spectrometer was used in conjunction with the existing visible light streak camera system. The emitted spectra was seen to consist solely of continuum radiation. This continuum data is now being used to determine electron density. To determine electron density from the continuum data, an absolute calibration of the detection system was required. The details of these experiments, and the absolute calibration technique are presented.
机译:本文介绍了在1-MA,上升时间为100 ns的康奈尔光束研究加速器(COBRA)上进行线阵列Z形夹的两项实验研究的结果。在第一项研究中,给出了表征内爆动力和特性的结果。线阵列Z夹在COBRA上的辐射输出。在这里,所研究的负载几何形状包括10毫米和20毫米高的圆柱形阵列,直径范围从4到16毫米,由8根,16根或32根钨丝,铝丝或因瓦合金钢制成(64%的铁,36%的铁)。 %镍)。诊断领域包括光学条纹相机,定时门极的紫外线取景相机,激光阴影图系统,时间集成的针孔相机,具有空间分辨率的X射线宽带聚焦光谱仪,X射线条纹相机,负载电压监视器,法拉第杯,辐射热计,硅二极管和金刚石光电导检测器。将分析并提供整个诊断程序产生的数据,以提供整个爆炸过程的详细情况以及在COBRA上产生的辐射输出。使用直径在峰值电流之前停滞的4毫米直径阵列可获得最高的X射线峰值功率(300--500 GW)和总能量产量(6--10 kJ)。其他发现包括,由于初始导线间距从1.6 mm更改为785μm,停滞前的软X射线辐射减少,并且高能电子的产生,硬X射线的产生和电子之间的时间相关性拖曳电流到达轴上-这可能是由于微夹点的形成而引起的。这些和其他发现的细节将被介绍和讨论。在第二项研究中,开发了一种新的诊断装置,以记录铝线阵列等离子体发射的可见光谱作为时间的连续函数。为此,将半米的Czerny-Turner光谱仪与现有的可见光条纹相机系统结合使用。观察到所发射的光谱仅由连续辐射组成。现在,该连续数据用于确定电子密度。为了从连续数据确定电子密度,需要对检测系统进行绝对校准。介绍了这些实验的详细信息以及绝对校准技术。

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    McBride Ryan;

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  • 年度 2008
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