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在Angara-5-1联合实验中,利用条纹像机和光纤阵列实现时间分辨和1维空间分辨,得到了丝阵条纹像,观察到丝阵负载箍缩区X光辐射的1维轴向空间分布信息随时间的演化过程,考察了内爆的同步性和均匀性。通过对比不同结构负载内爆等离子体X光1维时空分布信息,发现由于内层等离子体对磁流体瑞利-泰勒不稳定性的抑制作用,(40+20)根双层钨丝阵比60根单层钨丝阵的内爆轴向同步性好,产生的X光辐射功率高;由于负载存在弯曲、断丝、扭曲等现象,(60+30)根双层钨丝阵比90根单层钨丝阵的轴向同步优势不明显;轴向同步性好与辐射功率高之间存在相关性;辐射波形前沿较快时,X光功率较高。 相似文献
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利用一套罗斯滤片系统测量激光轰击固体金属Ti平面靶产生的X射线辐射通量,系统包括两个相同的X射线探测器及相应滤膜。罗斯滤片法的优点在于利用相邻核素对X射线相似的阻止率,可滤出一个窄的能带并去除高能部分的干扰,获得了Ti平面靶K壳层X光辐射产额。实验结果表明:硬X射线能段在4.5~4.9keV之间的K壳特征辐射占优,连续谱所占份额较低(与晶体谱仪一致);随着激光能量的增加,特征辐射增加;激光强度接近2×1015 W/cm2时,能量转换效率出现峰值。 相似文献
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Z-pinch experiments with two arrays consisting, respectively, of 32
4-μm- and 6-μm-diameter tungsten wires have been carried out on
QiangGuang-1 facility with a current rising up to 1.5MA in 80ns. At early
time of implosion, x-ray framing images show that the initial emission comes
from the central part of arrays, and double clear emission rings, drifting
to the anode and the cathode at 5×106cm/s and 2.4×107cm/s respectively, are often produced near the electrodes. Later,
in a 4-μm-diameter tungsten wire array, filamentation caused by ohmic
heating is prominent, and more than ten filaments have been observed. A
radial inward shift of arrays starts at about 30\,ns earlier than the
occurrence of the x-ray peak power for both kinds of arrays, and the
shrinkage rate of emission region is as high as 1.7×107cm/s in
a 4-μm-diameter tungsten wire array, which is two times higher than
that in a 6-μm one. Emission from precursor plasmas is observed in
implosion of 6-μm-diameter tungsten wire arrays, but not in implosion
of a 4-μm-diameter tungsten wire array. Whereas, in a 4-μm-diameter tungsten wire array, the soft x-ray emission shows the growth of
m=1 instability in the plasma column, which is caused by current. The
reasons for the discrepancy between implosions of 4-μm- and 6-μm-diameter tungsten wire arrays are explained. 相似文献
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在丝阵Z箍缩实验中利用CCD记录X射线辐射功率的1维时空分布图像,对光纤传输效率、图像聚焦、MCP与CCD的耦合效率等因素造成的图像失真进行了处理,利用实验实测的单光纤点扩展图像和光传输效率曲线对辐射功率分布图像进行处理,并修正光纤传输效率以及MCP和CCD间耦合效率不均匀性的影响以还原X射线辐射功率的1维空间分布信息。处理后将图像沿空间积分获得了与X射线功率谱仪相吻合的X射线辐射功率脉冲波形,同时不同发次由两系统得到的X射线波形的前沿之间也表现出了良好的一致性。 相似文献
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为了深入认识和理解Z-pinch物理机制并对物理实验进行优化设计,需要研究内爆等离子体及其辐射的时空分布特性诊断技术,建立诊断装置与设备,通过实验研究等离子体内爆时间过程及其空间分布特性,利用所获得的实验诊断数据校核数值模拟程序。简要介绍近几年开展的X光空间积分功率谱测量、X光时间积分针孔照相、X光时分幅针孔照相、X光时间分辨1维空间分布、紫外探针阴影照相等时空分辨诊断技术研究工作,并给出在1~3 MA电流驱动装置上进行的喷气和丝阵内爆实验中获得的部分时空分辨诊断结果,包括辐射功率、拉链速度、内爆速度、收缩比等。 相似文献
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Experimental study on imploding characteristics of wire-array Z pinches on Qiangguang-1 facility 总被引:1,自引:0,他引:1
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To investigate the imploding characteristics of cylindrical wire
array, experiments with load current varying from 1.5\,MA to 1.7\,MA
were carried out on the Qiangguang-1 facility. The complicated
temporal-spatial distribution of x-ray radiation was measured by the
one-dimensional (1D) x-ray imaging system. Other diagnostic
equipments including the x-ray power meter (XRPM) and the
time-integrated pinhole camera were used to record time-resolved
x-ray power pulse and pinhole x-ray images. Analysis shows that the
fast leading edge of the local x-ray radiation pulse is of primary
importance in sharpening x-ray power pulse rather than the temporal
synchrony and the spatial uniformity of implosion. Experimental
results indicated that the better axial imploding synchrony, the
faster the increase of x-ray power for an array consisting of 32
tungsten wires of 5\mum diameter than for the others, and the
higher the x-ray radiation power with maximal convergence ratio
(r_0/r_1) of 10.5. A `zipper-like' effect of x-ray radiation
extending from the anode to the cathode was also observed. 相似文献