一种高速多通道光纤阵列光开关

为了对短时间大视场一维光强信息进行采集,采用编码转换技术和自聚焦透镜矩形阵列设计了光开关,用小口径电光晶体实现了大视场的测量.采用MOS管级联的高压同步电路,使得系统具有结构紧凑、性价比高、寿命长等优点.实验结果表明:开关选通时间100±5 ns,前后沿小于25 ns,消光比1 100∶1.     

铝-钨丝混编阵的Z-箍缩实验研究

利用铝丝和钨丝混合编制的丝阵作为Z箍缩的负载，在俄罗斯Kurchatov研究所的S300强流装置上对其Z箍缩过程进行了实验研究，并与纯铝丝阵和纯钨丝阵的实验结果进行了比较.不同材料组成的丝阵的Z箍缩x射线能谱之间有明显差异，混编丝阵的铝K壳层的x射线辐射强度比纯铝丝阵的弱，在纯钨丝阵Z箍缩中没有发现波长小于1.6nm的线辐射.混编丝阵Z箍缩的x射线发光区域比纯铝丝阵的小，但比纯钨丝阵的大,混编丝阵的x射线产额比纯铝丝阵的大，但比纯钨丝阵的略低.在驱动电流为2.5—2.8MA条件下，Z箍缩的径向收缩比为4—5，x射线辐射脉冲脉宽为25ns左右，峰值为0.3—0.5TW，总能量为10—20kJ.激光探针的阴影像显示了丝阵等离子体形成的细致过程，还表明了等离子体的边界面不够清晰，其不稳定性有明显的发展，内部有丰富的结构. 关键词： Z箍缩 混编丝阵 S300强流装置     

“阳”加速器钼丝X-pinch初步实验研究

 在“阳”加速器上进行了直径分别为10, 15, 20 μm, 交叉角为32°,45°,60°的钼（Mo）丝X-pinch实验。“阳”加速器产生的电流峰值约520 kA，上升时间80 ns。实验中通过X射线功率谱仪和纳秒分幅相机等仪器对Mo丝X-pinch辐射特性进行了诊断。实验表明：Mo丝X-pinch过程中会出现多次X射线爆发，箍缩过程中产生的热点辐射出能量超过3 keV的X射线，探测到的最小热点直径小于30 μm。     

X-ray observations of tungsten wire array Z-pinch implosions on QiangGuang-1 facility

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.     

改进BaF2闪烁体光输出特征研究

介绍旨在抑制BaF2闪烁体慢发光成分,拓展其应用领域的紫外滤光膜系设计和性能测量结果,研究表明,以Al2O3/MgF2/Al/MgF2为基本结构优化设计的紫外滤光膜系对来自BaF2闪烁体不同角度入射的快/慢成分光分别具有高透射和强截止特性.还提供了用纳秒级脉冲辐射源激发"BaF2+紫外滤光膜系+光电闪烁探测器"系统获得的BaF2闪烁体时间响应曲线,并对紫外滤光膜系中子辐照损伤特性进行了研究.     

改进BaF2闪烁体光输出特征研究

介绍旨在抑制BaF₂闪烁体慢发光成分，拓展其应用领域的紫外滤光膜系设计和 性能测量结果，研究表明，以Al₂O₃/MgF₂/Al/MgF₂为 基本结构优化设计的紫外滤光膜系对来自BaF₂闪烁体不同角度入射的快/慢成分光分别具有高透射和强截止特性.还提供 了用纳秒级脉冲辐射源激发“BaF₂+紫外滤光膜系+光电闪烁探测器”系统获得的BaF₂闪烁体时间响应曲线，并对紫外滤光膜系中子辐照损伤特性进行了研究. 关键词： 2闪烁体')" href="#">BaF₂闪烁体 紫外线 滤光片 时间响应     

Experimental study on of wire-array Z pinches imploding characteristics on Qiangguang-1 facility

To investigate the imploding characteristics of cylindrical wire array, experiments with load current varying from 1.5MA to 1.7MA 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 μm diameter than for the others, and the higher the x-ray radiation power with maximal convergence ratio （r0/r1） of 10.5. A ‘zipper-like＇ effect of x-ray radiation extending from the anode to the cathode was also observed.     

Z-pinch内爆等离子体时空分辨诊断技术

 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。     

一种新型快塑料闪烁体的性能研究

针对Z箍缩x辐射测量的需要，研制了一种新型的塑料闪烁体，具有对可见光抑制 能力强、x射线能量响应平坦、发光时间快等特点.利用同步辐射装置3W1B光站的单色软x射 线源、CΓC67型皮秒脉冲辐射源、Lamde 2型紫外/可见分光光度计等实验设备，测量了这 种闪烁体的能量响应、衰减时间、对可见光的透过效率、发光光谱等特性.实验表明，这种 闪烁体对可见光的透过率小于5%、发光时间约6ns、对100—1400eV的x射线具有平坦能量响 应，能够满足Z箍缩软x辐射测量. 关键词： Z箍缩 x射线 新型闪烁体     

双层并联碲锌镉探测器制备及性能测试

实验采用并联方法制备了叠层(双层)碲锌镉探测器，并利用241Am@59.54 keV和57Co@122 keV γ射线源测试了其γ能谱特性。相比单层探测器，对于较高能量的57Co@122 keV γ射线，叠层碲锌镉探测器表现出较高的探测效率和光峰值效率，较好地改善了康普顿连续统一体。叠层CZT探测器较之单层探测器，能谱分辨率发生轻微恶化。实验初步表明，通过并联叠加方法制备叠层碲锌镉探测器是可行的，并可推断制备更大厚度的叠层探测器将有利于中高能γ射线能谱测量。