Optimum Electron Temperature and Density for Short-Wavelength Plasma-Lasing from Nickel-like ions

Masoudnia, Leili; Bleiner, Davide (2014). Optimum Electron Temperature and Density for Short-Wavelength Plasma-Lasing from Nickel-like ions. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 323, pp. 59-70. Elsevier 10.1016/j.nimb.2013.12.008

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Soft X-ray lasing across a Ni-like plasma gain-medium requires optimum electron temperature and density for attaining to the Ni-like ion stage and for population inversion in the View the MathML source3d94d1(J=0)→3d94p1(J=1) laser transition. Various scaling laws, function of operating parameters, were compared with respect to their predictions for optimum temperatures and densities. It is shown that the widely adopted local thermodynamic equilibrium (LTE) model underestimates the optimum plasma-lasing conditions. On the other hand, non-LTE models, especially when complemented with dielectronic recombination, provided accurate prediction of the optimum plasma-lasing conditions. It is further shown that, for targets with Z equal or greater than the rare-earth elements (e.g. Sm), the optimum electron density for plasma-lasing is not accessible for pump-pulses at View the MathML sourceλ=1ω=1μm. This observation explains a fundamental difficulty in saturating the wavelength of plasma-based X-ray lasers below 6.8 nm, unless using 2ω2ω pumping.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Applied Physics

UniBE Contributor:

Masoudnia, Leili and Bleiner, Davide

Subjects:

600 Technology > 620 Engineering

ISSN:

0168-583X

Publisher:

Elsevier

Language:

English

Submitter:

Martin Frenz-Lips

Date Deposited:

05 Feb 2015 11:01

Last Modified:

14 Mar 2016 12:47

Publisher DOI:

10.1016/j.nimb.2013.12.008

BORIS DOI:

10.7892/boris.62363

URI:

https://boris.unibe.ch/id/eprint/62363

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