Abstract
The possibility to demonstrate X-ray lasing in nitrogen at 13.4 nm through recombination scheme driven by capillary discharge excitation has been explored at a high discharge current of ~95 kA, with ~46 ns quarter period. The emission from nitrogen pinch plasma showed a fast pulse at the instant of pinch formation, overriding the long duration Bremsstrahlung emission. The spectroscopic study revealed dominant X-ray line emissions at 2.8 and 2.1 nm, apart from various X-ray line emissions at higher wavelengths. Line emission at 2.8 nm confirms the formation of NVI charge state of nitrogen. At lower pressures, faint emission of Ly-α line at 2.4 nm indicated formation of NVII ions by further heating. The favourable role of pre-pulse in the formation of higher charge states of nitrogen was also established beyond doubt. This study provides important inputs for future experiments towards demonstration of X-ray lasing at 13.4 nm.
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The authors would like to thank R. P. Kushwaha for all the mechanical engineering support provided by him for the capillary discharge system.
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Barnwal, S., Nigam, S., Aneesh, K. et al. Exploring X-ray lasing in nitrogen pinch plasma at very high and fast discharge current excitation. Appl. Phys. B 123, 178 (2017). https://doi.org/10.1007/s00340-017-6751-6
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DOI: https://doi.org/10.1007/s00340-017-6751-6