X光激光实验中的等离子体状态诊断
DIAGNOSIS OF GERMANIUM PLASMA CHARACTERISTIC IN X-RAY LASER EXPERIMENTS
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摘要: 在LF-12激光装置上,将500~600J、约1.5ns脉冲宽度的Nd玻璃激光聚焦成约120μm宽、20mm长的线作用到1mm厚的锗平面靶上。在靶室内设置具有空间分辨本领的平晶谱仪(测量波长范围在0.6~0.9nm)诊断锗等离子体状态。用2p-nd(n≥4)能级跃迁的类Ne离子谱线间的相对强度比估计等离子体电子温度在400~600eV。在实验中测到的线谱主要是类Ne GeXXⅢ离子产生的,类F GeXXⅣ离子产生的谱线次之,类Na GeXXⅡ离子产生的谱线比较弱。并且初步观察到线状等离子体轴向分布均匀性和横向离子分布特征。Abstract: A 500~600J, l.5ns, and 1.05μm laser beam was focused to a 120μm×20mm line on a 1mm thick germanium target. Space-resolved X-ray crystal spectrograpies were utilized to measure X-ray spectral intensilies. The electron temperature in the Ge XXⅢ plasma was estimated to be 400~600eV from intensity ratios of the 2p-nd (n≥4) transition lines. Two types of axial structure were abserved, one characterized by a finely corrugated structure, and the other by a mm scale irregular nonuniformity.
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