A modification of the laser detonation-type hyperthermal oxygen atom beam source for a long-term operation.
A modification of the laser detonation-type hyperthermal oxygen atom beam source for a long-term operation.
复制标题
激光爆轰型高温氧原子束源的改进，可长期运行。
DOI：
10.1063/1.2957613
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
N. Ohmae
中科院分区：
文献类型：
--
作者：
H. Kinoshita;Shunsuke Yamamoto;Hideaki Yatani;N. Ohmae
对于激光爆轰式原子束发生器来说，脉冲超音速阀中的提动阀芯在强激光和高温等离子体的照射下会被快速侵蚀，这一直是激光爆轰式原子束发生器的一个难题。为了长时间操作原子束源，进行了修改以隐藏提升阀以防止激光和等离子体的直接照射。装置配置的改变使得提升阀芯的耐用性大大提高，超过30万次重复。暴露于约 200,000 次高温氧原子束脉冲的聚酰亚胺薄膜的形态显示出毛茸茸的地毯结构，这是暴露于高能氧原子的薄膜的特征。在距喷嘴喉部 30 cm 的位置处，氧原子束的通量估计为 5x10(14) 原子/cm2/脉冲。
It has been an impedimental problem, for the laser detonation-type atom beam generator, that a poppet in the pulsed supersonic valve is rapidly eroded by the irradiation of powerful laser light and high temperature plasma. In order to operate the atom beam source for a long duration, a modification was made to hide the poppet from direct irradiation of laser and plasma. The alteration of device configuration resulted in great improvement in endurance of poppet more than 300,000 repetitions. Morphology of a polyimide film exposed to approximately 200,000 pulses of hyperthermal oxygen atom beam showed a shaglike carpet structure, which is a characteristic to that exposed to energetic oxygen atoms. A flux of the oxygen atom beam was estimated to be 5x10(14) atoms/cm2/pulse at a location of 30 cm away from the nozzle throat.