Extreme degree of ionization in homogenous micro-capillary plasma columns heated by ultrafast current pulses

G. Avaria, M. Grisham, J. Li, F. G. Tomasel, V. N. Shlyaptsev, M. Busquet, M. Woolston, J. J. Rocca

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

12 Citas (Scopus)

Resumen

Homogeneous plasma columns with ionization levels typical of megaampere discharges are created by rapidly heating gas-filled 520-μm-diameter channels with nanosecond rise time current pulses of 40 kA. Current densities of up to 0.3GAcm-2 greatly increase Joule heating with respect to conventional capillary discharge Z pinches, reaching unprecedented degrees of ionization for a high-Z plasma column heated by a current pulse of remarkably low amplitude. Dense xenon plasmas are ionized to Xe28+, while xenon impurities in hydrogen discharges reach Xe30+. The unique characteristics of these hot, ∼300:1 length-to-diameter aspect ratio plasmas allow the observation of unexpected spectroscopic phenomena. Axial spectra show the unusual dominance of the intercombination line over the resonance line of He-like Al by nearly an order of magnitude, caused by differences in opacities in the axial and radial directions. These plasma columns could enable the development of sub-10-nm x-ray lasers.

Idioma originalInglés
Número de artículo095001
PublicaciónPhysical Review Letters
Volumen114
N.º9
DOI
EstadoPublicada - 5 mar 2015
Publicado de forma externa

Áreas temáticas de ASJC Scopus

  • Física y astronomía (todo)

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