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Optimization of X-Ray Laser Pumping in Recombining Plasma Scheme

复合等离子体方案中 X 射线激光泵浦的优化

基本信息

批准号：
09680469
负责人：
YAMAGUCHI Naohiro
金额：
$ 2.24万
依托单位：
Toyota Technological Institute
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

Atomic processes and the effect of irradiation schemes has been investigated in the recombination x-ray laser.1.Soft x-ray spectroscopy of x-ray laser media in the recombining plasma schemeA new soft x-ray spectrograph has been designed and constructed for diagnostics of highly ionized aluminum plasmas. The absolute calibration of the soft x-ray spectrograph was performed for the wavelength range from 2 to 5 nm by using synchrotron radiation or laserproduced plasma. Spectroscopic analyses showed that the electron temperature was very low in the plasma where the population inversion was produced and the measured population density of excited state of Li-like ions agreed well with the calculated population density from the new CR model that included doubly excited states of Be-like ions.2.Effects of irradiation scheme(1)Pulse-train irradiationEffects of irradiation scheme on x-ray laser gain production were investigated systematically for the three types of pulse-train waveform. Plasma hydrodynamics simulation was also performed to search the time history of plasma parameters for each pulse-train waveform. The experimental results have been interpreted by combining the simulation and the new CR model calculation.(2)Micro-dot-array irradiationThe micro-dot-array irradiation pattern was produced by using a new line-focus optics with a segmented prism array for a YAG laser beam. It was confirmed that the plasma produced by this irradiation method could expand rapidly and could reduce its electron temperature faster than that in a plasma produced by a smooth line focus irradiation.

本文研究了复合X射线激光中的原子过程和辐照方案的影响。1.复合等离子体方案中X射线激光介质的软X射线光谱学设计并建造了一台新的软X射线光谱仪，用于诊断高电离铝等离子体。用同步辐射或激光等离子体对软X射线光谱仪进行了2 ~ 5 nm波长范围的绝对定标。光谱分析表明，在产生粒子数反转的等离子体中，电子温度很低，类锂离子激发态粒子数密度的测量值与用新的CR模型计算的包含类铍离子双激发态的粒子数密度符合得很好。2.辐照方案的影响（1）脉冲序列辐照辐照方案对x-系统地研究了三种脉冲序列波形的激光增益产生。等离子体流体动力学模拟也进行了搜索的时间历程的等离子体参数为每个脉冲序列波形。将模拟结果与新的CR模型计算结果相结合，对实验结果进行了解释。（2）微点阵辐照采用新型的线聚焦光学系统，利用分段棱镜阵列，对YAG激光束进行微点阵辐照。结果表明，与平滑线聚焦照射产生的等离子体相比，该照射方法产生的等离子体能够迅速膨胀，电子温度降低得更快。