共查询到13条相似文献,搜索用时 78 毫秒
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自由电子激光新发展的高增益工作模式(HG;HG,EEHG)具有独特的优势,但需要外种子激光与电子束团相互作用,为满足实验的要求,我们在上海深紫外自由电子激光装置(SDUV-FEL)上建立了新的种子激光传输注入与测量系统,实现了种子激光的有效注入。通过采用光参量放大器(OPA),使得注入激光工作波长大范围可调;通过高精度的光学调节与测量装置,实现种子激光与电子束团的精确同步,精度达到亚皮秒量级,测量结果显示激光对电子束团进行了有效的调制。通过以上技术,在上海深紫外自由电子激光装置(SDUV-FEL)上成功完成了HGHG与EEHG的相关实验。 相似文献
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清华汤姆逊X射线源中,束流动力学性能和对撞时间要求光阴极微波电子枪的触发激光脉冲与加速相位精确同步.本文分别介绍了超快紫外激光系统设计与实现、光阴极微波电子枪定时系统设计,以及同步系统的亚皮秒抖动测量.用高次谐波相位检波器法测量相位噪声功率谱密度可以获得精确的激光-射频相对均方根时间抖动,实验测定为小于200fs[1Hz,100kHz]. 相似文献
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《Journal of Nuclear Science and Technology》2013,50(8):715-718
A planar hybrid undulator was constructed for the JAERI PEL. In order to evaluate the performance of the undulator, magnetic field of the undulator was mapped by a detailed field measurement system. The field map obtained experimentally was compared with the map calculated by computer. The undulator field was found to be sinusoidal in the longitudinal direction and almost flat In the transverse direction. The performance of the undulator was found out to be sufficient to lase the JAERI FEL, because the irregularity of the field pattern of the undulator is sufficiently small. 相似文献
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介绍了CFBR-Ⅱ堆泵浦3He-Ar-Xe体系1.73μm波长激光小信号增益和泵浦效率的实验研究.在脉冲峰热中子注量率为6.9×1014cm-2.s-1、3He、Ar、Xe气体的比例为80.219.30.5,总压强为8.3×104Pa时,采用透射率从1.7%到10%的6个谐振腔输出镜均获得了激光输出.在谐振腔输出镜透射率为7%时,得到了激光脉冲峰功率为45mW,其对应的激光泵浦效率为1%.在此基础上,利用Rigroa分析方法拟合出3He-Ar-Xe体系激光的小信号增益为0.24%/cm,饱和光强为36W/cm2. 相似文献
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Based on a femtosecond linear accelerator, here we present a study of the use of a groove guide as the FEL interaction structure for high power FEL experiment. The transmission and attenuation characteristics of the dominant mode in the groove guide are discussed. And the coherent spontaneous emission in the FEL is simulated by Gover theory. 相似文献
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核阀阀瓣激光熔覆层显微组织和耐高温磨损性能研究 总被引:3,自引:0,他引:3
应用 5kW横流CO2 激光器对核阀阀瓣密封面进行Co基合金的激光熔覆处理 ,对激光熔覆层和等离子熔涂涂层进行了显微组织分析和抗高温冲击滑动磨损性能对比试验研究。结果表明 :激光熔覆层的组织细密均匀 ,气孔、夹杂物少 ,稀释率低 ,其抗高温冲击滑动磨损性能明显高于等离子熔涂工艺。 相似文献
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ITER中的电子回旋波电流驱动模拟 总被引:1,自引:1,他引:1
通过将相对论Fokker-Planck方程与波迹方程联合求解,对ITER(国际热核实验反应堆)参数下的电子回旋波电流驱动进行了数值模拟。结果表明,当波的环向发射角度不太大时,波功率沉积将发生在ITER的强场侧。当环向发射角度为21°时,电子回旋波的能量在等离子体中心区域被吸收并驱动起等离子体中心区域的电流。当发射角度变大时,电子回旋波将在弱场侧沉积功率。当发射角度为20°~30°时,能够驱动归一化的径向位置(r/a)小于0.35区域内的等离子体电流,并有较高的电流驱动效率。 相似文献
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《Journal of Nuclear Science and Technology》2013,50(11):1054-1060
The parallel and perpendicular velocity distributions of a gadolinium atomic beam produced with an axial electron beam gun have been measured by a Doppler-shift technique and a Doppler limited absorption spectroscopy, respectively. The atomic density of 1018~1019atoms/m3 at a laser irradiated zone was sufficient for the process, such as an atomic vapor laser isotope separation. The atomic beam velocity of 800 m/s was obtained by a free expansion near an evaporation surface. This velocity, however, was 100 m/s slower than that we had measured with a magnetic transverse electron beam gun in a previous experiment. The reasons for the slower velocity in this experiment than that in the previous one are discussed. In keeping with the deposition rate, the parallel translational temperature rapidly decreased to 200 K, while the perpendicular translational temperature gradually increased and approached to the parallel translational temperature. This result suggested that the collisional region where both translational temperatures are equal extended to the laser irradiated zone in high-rate evaporations. 相似文献