预脉冲在毛细管快放电软x射线激光中的作用  

Effect of pre-pulses on capillary discharge soft x-ray laser

作　　者：程元丽[1] 栾伯含[1] 吴寅初[1] 赵永蓬[1] 王骐[1] 郑无敌[2] 彭惠民[2] 杨大为[3] 

机构地区：[1]哈尔滨工业大学可调谐激光技术国家级重点实验室,哈尔滨150001 [2]北京应用物理与计算数学研究所,北京100088 [3]中国原子能科学研究院,北京102413

出　　处：《物理学报》2005年第10期4979-4984,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:60038010);国家863计划项目(批准号:2002AA84ts23)资助的课题.~~

摘　　要：在一台毛细管快放电软x射线激光实验装置上,在相同主脉冲条件下(电流峰值18—30kA,半周期80ns),通过观测放电产生的软x射线辐射,研究了该装置固有的高幅值(2—5kA)和外加的低幅值(10—20A)两种预脉冲,对聚乙烯毛细管和高纯度陶瓷毛细管(99·9%)放电的管壁烧蚀及等离子体状态的影响.采用装置固有的几kA预脉冲和聚乙烯毛细管,放电过程中产生了大量的管壁烧蚀,并且这种情况下的等离子体均匀性差,没有可能获得激光输出.而采用20A的预脉冲和高纯度陶瓷毛细管,管壁烧蚀量大大减少,预电离等离子体的均匀性好,在这种情况下,实验上利用x射线二极管观测到了激光尖峰信号.On a capillary discharge setup lasing in Netlike Ar at 46.9nm, the ablation of capillary wall was investigated for polythene and alumina material at both of inherent 2-5kA-pre-pulse of setup and separate pre-pulse of 20A by measuring soft x ray emission from the capillary discharged. For inherent pre-pulse and polythene capillary, the ablation is too large to create uniform plasma columns and it is impossible to obtain lasing. In the case of 20A-pre-pulse and alumina capillary, the ablation decreased remarkably and the laser spike pulse was distinguished on an x-ray diode because the uniform Z-Pinch plasma column had formed.

关 键 词：预脉冲 毛细管放电 软X射线激光 软X射线激光 放电过程 毛细管 等离子体状态 实验装置 软x射线辐射 X射线二极管 

分 类 号：TN24[电子电信—物理电子学] P427.322[天文地球—大气科学及气象学]