QQ客服 官方微博 反馈留言

题名	片状放大器性能研究与分析
作者	刘涛
学位类别	硕士
答辩日期	2014
授予单位	中国科学院上海光学精密机械研究所
导师	周申蕾
关键词	钕玻璃片状放大器 氙灯泵浦 模拟退火算法 蒙特卡罗
其他题名	The Research and Analysis of Slab Amplifier Property
中文摘要	惯性约束核聚变（ICF）已经成为当今世界备受关注的研究领域之一，由于ICF装置系统复杂、规模庞大、建造费用高昂，因此对系统中的每个模块单元进行优化设计显得十分重要，这不仅能够提高系统的性价比还可以降低工程的建造难度。放大器作为其中最重要的组成部分，其性能决定了整个系统的增益以及增益均匀性等主要指标，所以要实现整个驱动器系统性能的提高关键是对放大器进行优化。目前国内外在放大器的优化设计方面做了大量工作，建立了许多重要的分析和经验模型，并提供了多种用于分析模型性能的算法。 本文在前人工作的基础上，主要从泵浦模块的优化、放大器传输效率的提高以及泵浦均匀性的改善三方面入手，具体分析其中各因素对放大器性能的影响，主要包括以下几方面的工作： （1）根据放电回路和氙灯的有关理论建立了氙灯辐射数值模型，分析充电电压对氙灯光学特性的影响，结果表明：当氙灯正常工作时，充电电压越高，氙灯的有效输出光谱效率越低。 （2）使用改进的模拟退火算法优化了氙灯的放电回路，优化之后氙灯的放电脉冲变窄，在保证氙灯有效输出光谱效率的情况下提高了氙灯的辐射能量，经过优化，氙灯在峰值电流处的有效辐射能量提高了7.91%，上升沿宽度、半宽、1/10宽度分别减少18.9%、16.7%、13.4%。分析了口径和充气气压对氙灯辐射效率的影响，大口径氙灯在低电流密度时具有较高的有效输出光谱效率，但是随着电流的提高，其效率最终会低于小口径的氙灯。高气压氙灯虽然在低电流密度时具有较高的有效输出光谱效率，但是在整个放电过程中，低气压氙灯的效率值略高。 （3）建立了钕玻璃片状放大器结构模型，利用蒙特卡罗光线追迹分析放大器中边缘片与中心片上光线分布以及上下反射板对增益介质表面光线沉积的影响，结果表明：上下反射板的反射率越高，钕玻璃表面沉积的光线数量越多，均匀性越好。采用模拟退火算法合理设计氙灯的分布，进一步提高了钕玻璃表面的光线沉积的均匀性。 （4）根据（3）中的放大器结构模型，模拟计算了上下反射板和优化氙灯排布对放大器传输效率的影响。
英文摘要	Inertial Confinement Fusion (ICF) has become one of the most attractive research area around the world. Because of the complexity, large scale and high expense in ICF device, so it is significant to optimize each unit in such a system. In this way, not only the cost will be cut down, but also reduce the difficulty in construction. As an important part, the performance of amplifier plays an important role in deciding the gain and gain uniformity of ICF system, so it plays a key role to optimize the amplifier in improving the property of the whole laser driver system. So far much work has been done in terms of optimizing the amplifier in the world, and several important analytical and empirical models have been established, accompanied by a large number of algorithms to analysis the consequence of the model. Based on previous work, we start from the optimization of pump module and the transmission of amplifier cavity to analysis the effect of different factors on the performance of amplifier in detail, and the related contents are listed as follows: 1. A Xenon lamp radiation numerical model is built according to the theory of discharge circuit and flashlamp. We present the influence of discharge circuit on xenon lamp optical properties. The result shows the effective spectral efficiency will become lower when the charging voltage is increased. 2. Utilizing simulated annealing algorithm, we optimize the discharge circuit and the width of discharge pulse becomes narrow. The radiation power of xenon lamp is improved while the effective spectral efficiency is guaranteed. After optimized the radiation power is increased by 7.91% at peak current, at the same time the rising-edge-width, full-width fiftieth-max, full-width tenth-max are reduced by 18.9%, 16.7, 13.4%. The influence of aperture and pressure on xenon lamp radiation efficiency is analyzed. Result shows when current density is low, the effective spectral efficiency of large aperture lamp is relatively high, but as the current density is increasing it will become smaller than the small aperture ones. Although lamps with high pressure own higher effective spectral efficiency, during the whole discharge process, lamps with low pressure have larger radiation efficiency. 3. A structure model of Nd-Glass amplifier is built to analysis the difference between center slab and edge slab in amplifier and the effect of top-bottom reflectors on light deposition using Monte Carlo Method. The result suggests the higher reflectivity of top-bottom reflectors, the better of uniformity and total light number. The xenon lamp distribution is optimized by simulated annealing algorithm, and the uniformity of light deposition is improved. 4. The performance of top-bottom reflectors and xenon lamp distribution is analyzed when calculating transmission efficiency according to the amplifier model above.
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/16868]
专题	上海光学精密机械研究所_学位论文
推荐引用方式 GB/T 7714	刘涛. 片状放大器性能研究与分析[D]. 中国科学院上海光学精密机械研究所. 2014.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。