کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5428794 | 1508688 | 2013 | 7 صفحه PDF | دانلود رایگان |
- We study the recombination pumping scheme for x-ray laser in nitrogen.
- We used a capillary discharge z-pinch apparatus with current pulse of 60Â kA in 60Â ns.
- We measured time resolved x-ray spectra using transmission grating spectrometer.
- We developed a collisional-radiative atomic model to analyze the spectra.
- The CR model takes opacity effects under account.
Capillary discharge plasmas can serve for recombination-pumped x-ray lasers. We present time-resolved x-ray spectra and density measurements of a nitrogen capillary discharge z-pinch plasma. We use a free-standing transmission grating spectrometer and a gated MCP camera. This is the first time both K-shell and L-shell line emission of the nitrogen plasma are recorded simultaneously. Comparison of the spectra with a 4-ion collisional-radiative atomic model, which accounts for opacity effects, shows that the plasma reaches a maximum temperature of kTe=75-85 eV during the pinch, and adiabatically cools in less than 4 ns. This is slightly less than the newly estimated goal temperature of 110 eV. The fast cooling demonstrates the feasibility of a recombination-scheme laser in the nitrogen Hα line at 13.37 nm, if higher plasma temperature is achieved.
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 127, September 2013, Pages 176-182