Dependence of the spectrum of hydrogen-like ions on the electron density in a laser plasma

Abstract

A practical technique is described to estimate the resonant frequency of a helical resonator surrounding a coaxially mounted discharge tube. A simple formula is derived that relates the resonant frequency of the cavity to dimensions and dielectric properties of the discharge tube and its contents An experimental test is performed on a resonator used to power an RF discharge, designed to produce an atomic hydrogen beam for an atomic collision experiment. T h e formulation adequately predicts the resonant frequency for a helical resonator that contains a discharge tube and cooling water jacket.

Measurements of electron density in laser-produced plasmas from the XUV spectra of oxygen-like ions

“…The dependence of intensity ratios 8 on electron density for ions CaXIII, TiXV and NiXXI is shown in figures 1-3. The ratio 6 for NiXXI is presented in figure 3, whereas the ratios 6 for CaXIII, TiXV and FeXIX were calculated earlier by Vinogradov et al (1977bVinogradov et al ( , 1978.…”

Density-Dependent Lines of One- and Two-Electron Ions in Diagnostics of Laboratory Plasma. II. Intensity Line Ratios of Hydrogenlike, Heliumlike and Oxygenlike Multicharged Ions

“…It can be shown that electron-ion but not ion-ion collisions give the main contribution to the collisional relaxation rates. Then the solution of [ 2 1 ] may be represented as [34]:…”

“…Similar dependences 6 ( N e ) were used in [34] to determine the laser plasma density with the aid of spectra of the ions Ca XI11 and Ti XV.…”