排序方式: 共有23条查询结果,搜索用时 15 毫秒
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激光聚变中硬X光能谱回推方法 总被引:1,自引:0,他引:1
介绍了滤波荧光法工作原理,以及由10道滤波荧光谱仪测量结果回推靶等离子体中硬X光能谱的详细过程。该回推方法对初始谱有很强的适应性,解谱结果与初始试探谱无关。 相似文献
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腔靶内超热电子的实验研究 总被引:1,自引:1,他引:0
介绍了利用10道滤波荧光谱仪(简称F.F.谱仪)测量新型腔靶中超热电子产生的硬X光能谱,并结合GaAs阵列探测器测量硬X光角分布,给出了腔外硬X光总能量,同时用F.F.谱仪测量结果与其同方位的GaAs探测器测量结果比对,两者在误差范围内是一致的。在F.F谱仪和GaAs探测器两者数据比较自洽的情况下,并与后向受激拉曼散射光特征量比较,得出了:(1)腔靶内超热电子不是各向同性均匀分布的,大部分超热电子沿着入射激光光轴方向运动;(2)腔内大部分超热电子与冷介质(腔壁)发生库仑作用产生硬X光。 相似文献
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MECHANISM OF HOT ELECTRON GENERATION AND STIMULATED RAMAN SCATTERING IN LASER CAVITY TARGET PLASMA 下载免费PDF全文
Stimulated Raman Scattering (SRS) and X-ray spectrum emitted from many kinds of targets were experimentally investigated on the Nd:glass laser facility Shenguang-I in Shanghai, China. By theoretical analysis and computer simulation for these experiments, the result showed that the mechanism of hot electron generation in laser cavity target was mainly SRS, according to detailed comparison between the cavity target and the plane target. Other results, such as the energy fraction and temperatures of hot electron, energy and angular distribution and wave spectrum in SRS, were also presented in detail. 相似文献
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质子激发X光源及其应用 总被引:5,自引:1,他引:4
本文介绍了用质子束激发靶元素发射特征线的方法建立的高强度、准单色低能X光源的主要特征、物理性能及其实际应用。当K-400加速器提供的质子流指标为1mA/270keV时,在0.183-3keV之间的9个能点上,其相应源强可达10~(10)-10~(13)个/s数量级,为低能X光诊断技术的发展提供了必要条件。 相似文献
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在“星光Ⅱ”上进行几种特殊靶材盘靶和特殊结构腔靶产生超热电子和非线性过程 (受激Raman散射 (SRS)、双等离子体衰变 (TPD)、受激布里渊散射 (SBS)特征实验研究。该实验表明 :低ZCH泡沫或CH膜对抑制超热电子预热和非线性过程的产生是不利的 ,它们不作腔的第一打击面。 相似文献
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介绍“神光Ⅱ”首次进行大能量基频光黑腔靶实验超热电子实验观测,采用十道滤波荧光谱仪(FFS)测量腔靶发射15—250keV硬x射线谱,由高能x射线谱通量推断超热电子占入射激光能量份额ηhe为13%—16%,由谱的斜率推断超热电子温度Th为35—45keV,由超热电子能量和受激拉曼散射光(SRS)能量的关联,推断超热电子产生的机理,并给出了不同腔靶在不同激光能量EL下超热电子产生的特征
关键词:
1.053μm激光
超热电子
黑腔靶
大能量激光 相似文献
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Fraction and Temperature of Hot Electrons Generated by Laser—Plasma Interaction at the shenguang—Ⅱ Laser Facility 下载免费PDF全文
We have developed a three-dimensional electron-photon Monte Carlo transmission (MCT) code.The conversiontransmissivity coefficient of hot electron x-ray,ηct,is analysed theoretically and simulated numerically using the MCT code.Experiments of disc and cylindrical targets have been performed at the Shenguang-Ⅱ laser facility.A Multi-channel filter-fluorescence spectrometer was used to obtain the hard x-ray spectrum.The temperature and energy of hot electrons are induced from the hard x-ray spectrum and the ηct value.The average energy fraction of hot electrons is 14% of incident laser energy for the 1ωNd laser and the spherical target with an average temperature of hot electrons of 36keV,while it is 15% for the 1ωNd laser and the cavity target with an average temperature of 54keV.We have also obtained the results of 5.6% and 13.3keV for the 3ωNd laser and the disc target,4.9% and 17.9keV for the 3ωNd laser and the half cavity target with a thin wall,and 2.1% and 22.4keV for those with a thick wall.The experimental results agree with theory and simulation. 相似文献