X-ray radiation properties of clusters heated by fs laser pulses
X-ray radiation properties of clusters heated by fs laser pulses
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飞秒激光脉冲加热团簇的 X 射线辐射特性
DOI：
10.1117/12.448457
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
V. Gasilov
中科院分区：
文献类型：
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作者：
A. Faenov;I. Skobelev;A. Magunov;T. Pikuz;J. Abdallah;G. Junkel;F. Blasco;F. Dorchies;C. Stenz;F. Salin;T. Auguste;S. Dobosz;P. Monot;P. D' Oliveira;S. Hulin;A. Boldarev;V. Gasilov
本文综述了短脉冲高强度TI:Sa激光加热不同团簇的x射线辐射特性的系统研究。簇靶是由带拉瓦尔喷嘴或锥形喷嘴的脉冲阀产生的Ar或CO2气体在真空中绝热膨胀形成的。气体喷射压力从15到100巴不等。对聚类参数进行了详细的理论建模，并与实验测量结果进行了比较。获得了氧和Ar类氢离子和类氦离子在共振线附近的高光谱和空间分辨率的x射线光谱，详细的光谱分析与辐照原子团簇结合高能电子效应的理论双温碰撞辐射模型相一致。详细研究了激光预脉冲对x射线强发射的作用及其空间分布。首次观测到电子密度大于1022 cm-3的等离子体的x射线能谱辐射。证明了快电子对类氦氩光谱的x射线发射有很大的影响。与各种实验条件下的数据比较，清楚地表明，要增加等离子体的x射线输出，最重要的是增加星团的大小，并具有合理的ps预脉冲值。
Review of systematic investigations of x-ray radiation properties of different clusters heated by short-pulse high- intensive TI:Sa laser radiation is presented. The cluster targets were formed by the adiabatic expansion in vacuum of an Ar or CO2 gas puff produced by a pulsed valve with a Laval or conical nozzles. The gas jet pressure is varied form 15 up to 100 bar. Detailed theoretical modeling of cluster parameters have been done and compared with experimental measurements. High spectrally and spatially resolved x-ray spectra near resonance lines of H- and He- like ions of oxygen and Ar have been obtained and detailed spectroscopic analysis was consistent with a theoretical two-temperature collisional-radiative model of irradiated atomic clusters incorporating with an effects of highly energetic electronics. The role of laser prepulse for x-ray intensity emission and its spatial distribution were investigated in details. X-ray spectra radiation from plasma with electron density more than 1022 cm-3 was at first time observed. Big effect of fast electrons influence on the x-ray emission of He-like Ar spectra was demonstrated. Comparison with data under various experimental conditions clearly demonstrated that for increasing x-ray output form plasma the most essential to increase size of clusters and has reasonable value of ps prepulse.