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S8-3 · Ways to Discharge-Based Soft X-ray Lasers with the Wavelength λ < 15 nm K. Kolacek, J. Schmidt, V. Prukner, O. Frolov, J. Straus Abstract: Two basic ways to amplification of spontaneous emission in soft X-ray region are described. The first is based on electron-collisional recombination pumping scheme, which uses recombination of fully stripped ions into hydrogen-like ions to create (in the case of sufficiently fast cooling) a population inversion on energy levels belonging to Balmer-alpha transition. We test this scheme on nitrogen, for which the lasing wavelength is 13,4 nm. The second way to amplification of spontaneous emission is based on electron-collisional excitation pumping scheme: this uses for creation of population inversion a fast excitation of Ne- or Ni-like ions. However, for wavelength below 15 nm it is necessary to use Ni-like ions of some metal vapours. Feeding metal vapours into a capillary is difficult, and if being fed they deposit on the capillary wall and significantly reduce the capillary lifetime. That is why we prepare metal vapour plasma in a capillary with liquid wall – by wire explosion in water. For slowdown of the plasma-channel expansion a local-water-compression by linearly focused shock wave is being developed.
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