X-ray lasing as a result of an induced instability in an ablative capillary discharge
X-ray lasing as a result of an induced instability in an ablative capillary discharge
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烧蚀毛细管放电中诱发的不稳定性导致 X 射线激光发射
DOI：
10.1088/0022-3727/34/3/315
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
E. Louis
中科院分区：
文献类型：
--
作者：
S. Ellwi;L. Juschkin;S. Ferri;H. Kunze;K. Koshelev;E. Louis
我们报告了使用烧蚀毛细管放电中诱导 MHD 不稳定性的新技术在 18.22 nm 处产生 CVI Balmer-α 线激光。在放电的后半周期期间观察到该线的大尖峰。该尖峰被识别为放大自发发射 (ASE)，并且针对长度在 15 至 50 毫米之间的毛细管得出增强效果。我们将 ASE 解释为 MHD 不稳定性颈部产生的离子与同一等离子体柱中存在的低温离子之间发生的电荷交换过程的结果。为了强调这种不稳定性，我们采用了一种新方法，使用内部印有波形结构的直毛细管。结果令人鼓舞，对于 40 毫米长的毛细管，GL = 4.5 时实现了指数增益长度。当引入反射率 < 30% 的平面多层镜导致放大时，即可实现支持观察结果的其他证据。
We report lasing of the CVI Balmer-α line at 18.22 nm using the new technique of an induced MHD instability in an ablative capillary discharge. A large spike of this line during the second half-cycle of the discharge is observed. The spike is identified as amplified spontaneous emission (ASE), and enhancements are derived for capillaries of lengths between 15 and 50 mm. We explain the ASE as a result of charge exchange processes which occur between ions produced in the neck of the MHD instability and low temperature ions present in the same plasma column. To emphasize this instability, we implemented a new method by using a straight capillary with a waved structure imprinted inside. The results are encouraging and an exponential gain length is achieved with GL = 4.5 for a 40 mm length capillary. Other evidence to support the observation is realised when a plane multilayer mirror with reflectivity < 30% is introduced resulting in amplification.