Your Search Results

Use this resource - and many more! - in your textbook!

AcademicPub holds over eight million pieces of educational content for you to mix-and-match your way.

Experience the freedom of customizing your course pack with AcademicPub!
Not an educator but still interested in using this content? No problem! Visit our provider's page to contact the publisher and get permission directly.

Time resolved XUV spectroscopy from highly ionized capillary discharges

By: Schmerge, J.F.; Beethe, D.C.; Villagran Muniz, M.; Marconi, M.C.; Rocca, J.J.;

1989 / IEEE


This item was taken from the IEEE Periodical ' Time resolved XUV spectroscopy from highly ionized capillary discharges ' The authors have carried out time-resolved measurements of the axial emission from capillary plasmas 500 mu m in diameter and several centimeters in length, excited by short (50-100 ns FWHM) discharge pulses. Extreme-ultraviolet spectra with 5-ns resolution in a single discharge shot are obtained using a 1-m-focal-length vacuum spectrograph. Analysis of the axial spectra from a 500- mu m diameter lithium hydride capillary shows simultaneous line emission from highly ionized (Li III, O VI) and single-ionized (O II) species. The data indicate the existence of a hot core plasma (T/sub e/>25 eV) surrounded by a significantly cooler (<5 eV) plasma near the walls. The situation is consistent with a model in which ablation of the capillary wall material is assumed to form a high-density plasma layer surrounding a less dense and significantly hotter core. Diffusion of totally stripped ions at the end of the current pulse from the core plasma into the cooler surrounding plasma could lead to a recombination region of annular shape in which gain could occur under optimized plasma conditions.<>