Bi^80＋辐射复合过程的多极计算

基于Dirac—Slater自洽场方法，中计算了Bi^79 离子从低能到高能的光电离截面；研究了半经典类氢近似Kramer公式的适用性；考察了多极效应、相对论效应在不同能区对光电离截面的影响；计算了Bi^80 离子在电离闲值附近的辐射复合截面和辐射复合速率系数，并将计算结果同高精度的储存环合并束实验结果进行了对比。     

High-resolution X-ray focusing concave (elliptical) curved crystal spectrograph for laser-produced plasma

The X-ray spectrum emitted from laser-produced plasma contains plentiful information.X-ray spectrometer is a powerful tool for plasma diagnosis and studying the information and evolution of the plasma.X-ray concave(elliptical)curved crystals analyzer was designed and manufactured to investigate the properties of laser-produced plasma.The experiment was carried out on Mianyang Xingguang-ⅡFacility and aimed at investigating the characteristics of a high density iron plasma.Experimental results using KAP,LIF,PET,and MICA curved crystal analyzers are described,and the spectra of Au,Ti laser-produced plasma are shown.The focusing crystal analyzer clearly gave an increase in sensitivity over a flat crystal.     

Bi80+辐射复合过程的计算

基于Dirac-Slater自洽场方法，计算了Bi⁷⁹⁺离子从低能到高能的光电离截面以及其逆过程Bi⁸⁰⁺的辐射复合截面; 分析了Kramers公式的适用性；考察了多极效应 、相对论效应在不同能区对辐射复合截面的影响；计算了Bi⁸⁰⁺离子在电离阈值附近 的辐射 复合截面和辐射复合速率系数，考察了自由电子分布函数及电子的温度变化对速率系数的影 响，并将计算结果同高精度的储存环合并束实验进行了对比. 关键词： 多极计算 辐射复合 光电离     

氪激光等离子体X射线谱研究

在"星光-Ⅱ"激光装置上,聚焦1.06 μm激光束于真空室内氪气体喷射靶上,产生氪元素激光等离子体.用PET(2d＝0.8742 nm)平晶谱仪测量了氪激光等离子体5.25～7.55 范围的X射线发射谱.基于准相对论多组态理论,考虑了CI作用和Breit修正,采用COWAN程序计算了氪的类C到类Mg离子3-2和4-2共振跃迁波长和跃迁几率.16条氪的类N至类F离子 - 共振线得到辨识和归类.本工作对于积累氪元素离子谱线数据具有重要的意义.     

滴水感应起电仪的实验及其改进研究

滴水自激感应起电仪,即开尔文滴水感应起电仪,是利用水滴流动与玻璃管摩擦起电,并静电感应循环累积电荷而产生越来越高的电位差的静电起电装置。本文通过对装置的系统划分,研究各部分对最终起电现象的影响,主要在漏电测试、电荷累积测量和仪器装置材料更换等方面来改进仪器装置。经过实验改进后,开尔文滴水感应起电仪的起电效果明显,现象稳定。     

光谱诊断与特征谱线输运

利用经过评估的原子过程参数,研究发现惯性约束聚变等离子体的特征发射光谱的共振线强度比值、伴线与共振线强度比值时等离子体温度变化很敏感,而特征谱线的线形函数对等离子体密度变化较敏感.结合特征谱线的一维输运方程研究,分析了中国工程物理研究院最近几年惯性约束聚变的内爆实验测量结果,得到了一些发次对应的等离子体温度和密度状态.     

同步辐射应用于软X射线探测器的标定

介绍同步辐射(SR)在惯性约束聚变(ICF)研究中的应用.北京同步辐射光源(BSRF)在专用光运行模式下,束流强度35—110mA,贮存环电子能量2GeV.标定前,首先采用1000PL/mm透射光栅作色散元件,对光源进行单色性研究,用面阵软X光CCD对光斑进行均匀性研究.在3W1B束线上,可用能区50—1550eV,通过不同材料前置滤片抑制高次谐波,获得单色性好于95%的单色光.几年来,对十余种ICF实验诊断用软X光探测元器件及设备进行了能量响应绝对标定.大量实验标定数据被用于ICF实验诊断,提高了ICF实验数据的精度     

Elliptically-bent crystal spectrograph for X-ray diagnosis of laser-produced plasmas

In order to measure spatially and temporarily resolved laser-produced plasma X-ray spectra in 0.2 - 2nm region, a novel two-channel elliptically-bent crystal spectrograph has been developed. Dispersive elements are LiF, PET, Mica, and KAP crystals, which cover Bragg angles in the range of 30 - 67.5degrees. Eccentricity and focal distance of twin ellipses are 0.9586 and 1350 mm, respectively. Spatially resolved spectrum is photographically recorded with an X-ray film or X-CCD camera in one channel, and temporarily resolved one is photographically recorded with an X-ray streak camera in another channel,thus spatially and temporarily resolved spectra can be simultaneously obtained. Spectral images were acquired with X-CCD and PET in SHENGUANG-Ⅱ laser facility, and experimental results show that the spectral resolution of the spectrograph is about 0.002 nm.     

Experimental observation of ionization and shock fronts in foam targets driven by thermal radiation

The behaviours of ionization and shock propagation in radiatively heated material is crucial for the understanding of indirect drive inertial confinement fusion as well as some astrophysics phenomena. In this work, radiation field with a peak temperature of up to 155 eV was generated in a gold cavity heated by four laser beams on the SG-II laser system and was used to irradiate a plastic foam cylinder at one end. The radiatively ablated foam cylinder was then backlighted side-on by x-ray from a laser-irradiated Ti disk. By observing the transmission decrease due to the shock compression of the foam cylinder, the trajectories of shock front were measured, and from the onset of the intense thermal emission from the side of the cylinder, the propagations of the ionization front were also observed on the same shot. The experimental measurements were compared to predictions of the radiation hydrodynamics code Multi-1D and reasonable agreements were found.     

EFFECT OF EXCITATION-AUTOIONIZATION IN NON-LOCAL THERMODYNAMIC EQUILIBRIUM PLASMAS

Based on the detailed configuration accounting model, the authros have developed a method to calculate the rate of excitation-autoionization (EA) in the average atom model and used it in the rate equations. The numerical results show that EA effect is signifficant in high temperature low density plasma and can cause an additional ionization up to 15% of an ionization stage.