Spectroscopic characterization of plasma densities of laser-irradiated Al foils

Abstract

Detailed spectroscopic analysis of K-shell emission simultaneously observed at the irradiated and unirradiated surface of laser-exploded foils is reported. The space-dependent spectral line widths and relative shifts in the positions of the Al Lyman transition are interpreted in terms of the plasma density variations; the trend in the shifts data supports the idea of a density-dependent line shift. The signiÿcant features of the spectra emitted from the densest part of the plasma are compared with predictions from standard diagnostics modeling based on codes MEDUSA and FLY, and with the results of 2D ATLANT hydrodynamic simulations post-processed with a novel suite of atomic physics codes XEPAP. The results obtained corroborate the feasibility of the plasma density diagnostics based on line shifts in the intermediately coupled plasmas. ?

Possibility of plasma density diagnostics using Langmuir-wave-caused dips observed in dense laser plasmas

“…The standard methods for the density diagnostics are typically based on precise measurements of the widths and shifts of the emitted spectral lines which both increase with the increasing electron density [19][20][21]. Here we compare the full experimental profiles of the Al Ly γ with those computed by using the codes IDEFIX [22,23] (for higher densities) and the code PIM PAM POUM [24] (for lower densities).…”

On Stark broadening as a tool for diagnostics of high density plasmas

“…For highly charged ions, SB presents other concerns, such as line shifts due to electron collisions~Nguyen et al, 1986;Koenig et al, 1988;Renner et al, 2003!. As integration along the line of sight includes different densities to which these shift are dependent, and can lead to apparent broadened and asymmetric profile. But regretfully, the various theoretical approaches differ considerably in the predicted shift values and their functional dependences on plasma parameters.…”