实验研究靶对超热电子行为的影响

研究了靶材料及靶厚度对超热电子产生机制及空间行为的影响。研究结果表明,在激光以45°角入射的条件下,靶材料对超热电子产生机制无明显影响,但靶材厚度对激光吸收效率有很大影响,而超热电子的空间行为并不随靶厚度变化,主要集中在靶前后表面的法线方向发射。     

超短脉冲激光辐照固体靶产生超热电子研究

实验研究了超短脉冲激光辐照固体靶产生的超热电子温度 ,所用方法是测量超热电子在固体中韧致辐射产生的硬X射线 ( >30keV)能量连续谱。中等强度 ( 1 0 16W /cm2 )、无预脉冲、红外超短脉冲( 74 4nm ,1 30fs,6mJ)、P极化激光 4 5°照射 5mm铜靶 ,产生了能量为 4 0 0keV的X射线信号 ,利用Maxwellian分布拟合能谱得到的超热电子温度为 85keV ,产生高能电子的主导吸收机制为真空加热。     

微通道板在超热电子磁谱仪上的应用

超短脉冲激光与固体靶相互作用产生超热电子,由于激光能量较低(10 mJ),所以产生的超热电     

电子磁谱仪法测量超热电子温度

利用超热电子磁谱仪测量了紫外超短脉冲激光与固体等离子体相互作用产生超热电子的能谱,在无预脉冲、激光强度为1017 W/cm2 条件下,紫外超短脉冲激光与固体(Cu)等离子体相互作用产生超热电子的能谱呈双温麦克斯韦分布,超热电子温度为81 keV,激光吸收的主导机制为真空吸收。     

超短脉冲激光与固体等离子体相互作用实验研究

实验研究了超短脉冲激光（744nm/120fs/12mJ）与固体（Cu）等离子体相互作用产生超热电子的能谱与角分布,利用电子磁谱仪与成像板（IP）探测器测量能谱,采用IP在入射平面内测量角分布。在无预脉冲、P极化激光45°斜入射下,采用Maxwellian分布拟合得到的超热电子温度为46keV,超热电子主要沿靶法线方向发射。产生超热电子的主导机制为真空加热,等离子体的电荷分离势约为70keV。     

超短激光与薄膜靶作用加速产生质子初步研究

物理学家利用高能粒子加速器进行了多方面的研究，但高能粒子加速器庞大且耗资巨大。随着超短超强激光的发展，现在的激光的功率密度可达到10^22W／cm^2。许多实验室利用不同功率密度的激光与固体靶、薄膜靶及气体等相互作用，进行加速产生高能粒子的研究。其中，利用超短超强激光与薄膜薄相互作用加速产生质子是一重要的研究课题，利用超热电子加速产生超热电子，     

靶材料与厚度对超热电子行为的影响

无预脉冲、P极化、10MW／cm2的红外（800nm）激光以45°辐照到靶面上,对于固体（Cu、A1）靶,超热电子的产生主导机制为真空加热,实验数据列于表1。     

Spaced-Resolved Electron Density of Aluminum Plasma Produced by Frequency-Tripled Laser

1 Introduction X-ray spectra emitted from hot dense plasmas pro- vide an important diagnostic tool to infer local plasma parameters, particularly the ionization stage, density, and temperature [1]. Analysis of the emission spectra of highly stripped ions from laser-produced plasmas is potentially the most direct and reliable method for de- ducing the ultra-high-pressure plasma conditions. The development of the diagnostic methods for electron den- sity will produce important effect on the stud…     

静态随机存储器的电磁脉冲效应实验研究

实验研究了静态随机存储器(SRAM)的电磁脉冲效应,重点研究存储器容量不同、不同脉冲宽度脉冲场激励以及存储器读写状态与否等情况下的效应规律,实验场强在2.5至40 kV/m之间。实验结果表明,存储器处于读写状态即片选有效时其效应更为严重,存储器的翻转效应与存储容量大小、激励电磁脉冲的脉冲宽度关系不大,电磁脉冲的场强幅值是其主要的敏感参数。     

Angular Distribution of Gadolinium Vapor Produced by Electron Beam Heating

Static corrosion tests were performed for the glass phase of a simulated waste form of non-combustible radioactive low-level waste to study a basic aqueous corrosion behavior. The waste form, which was fabricated from simulated waste sample by use of in-can type induction-heated melting, consists of two separated phases; a glass phase and a metal phase. Tests were performed for the glass phase from two types of the waste form with different chemical composition at 35°C and S/V ratio of 2,600 m^?1. The glass phase with both types showed an incongruent dissolution similar to conventional high-level radioactive waste (HLW) glasses, i.e., the normalized elemental mass loss (NL_i) for soluble elements such as B and Na continued to increase after the saturation of insoluble elements such as Si, A1 and Ca. The NL_i for B increased in proportion to the square root of time except for early stage, which suggests that the rate of the long-term dissolution or alteration may be controlled by a diffusion process. Potential secondary phases forming as the results of incongruent dissolution were estimated to be kaolinite and calcite by comparison of the measured solution data with the thermodynamically calculated phase stability relationships. These results suggest that the glass phase has a potential chemical durability not so different from conventional HLW glasses.     

Experimental Investigation of Glass-Layer Confined Ablation in Laser Plasma Propulsion

Laser plasma propulsion in glass-layer confined ablation was experimentally investigated. The results showed that compared to that of direct ablation, the coupling coefficient was enhanced over ten times. By observing the plasma expansion and calculating the ablation pressure, it was found that a higher ablation pressure and larger glass mass resulted in a higher coupling coefficient in the confined laser ablation.     

Experimental Investigation of Interaction of Ultra-short Pulse Laser With Atomic Clusters

Effects of experimental conditions to laser pulse laser with atomic clusters are investigated. same backing gas pressure. The size of cluster absorption coefficient at the interaction of ultra-short Big clusters are easily formed for high Z rare gases at is large at high backing gas pressure,