Abstract
We present laboratory measurement and theoretical analysis of silicon K-shell lines in plasmas produced by Shenguang II laser facility, and discuss the application of line ratios to diagnose the electron density and temperature of laser plasmas. Two types of shots were carried out to interpret silicon plasma spectra under two conditions, and the spectra from 6.6 Å to 6.85 Å were measured. The radiative-collisional code based on the flexible atomic code (RCF) is used to identify the lines, and it also well simulates the experimental spectra. Satellite lines, which are populated by dielectron capture and large radiative decay rate, influence the spectrum profile significantly. Because of the blending of lines, the traditional $G$ value and $R$ value are not applicable in diagnosing electron temperature and density of plasma. We take the contribution of satellite lines into the calculation of line ratios of He-$\unicode[STIX]{x1D6FC}$ lines, and discuss their relations with the electron temperature and density.
Highlights
K-shell lines of elements from astrophysical X-ray sources have been widely identified in high-resolution spectra, which are observed by X-ray satellites, such as Chandra and XMMNewton
We find that satellite lines may be blended with the He-like triplet lines, and impact their line ratios, which are widely used in plasma diagnosis
Shot 28 and Shot 32 used the Type II target. In both types of shots, the center of the silicon plate lower surface was set at the target chamber center (TCC), and two 240 J driven laser beams were used, whose wavelengths were 351 nm and durations were 1 ns
Summary
Many theoretical calculations[4, 9,10,11] have been performed to derive the wavelengths and transition rates of K-shell lines using kinds of atom structure codes These include using HFR[12] and AUTOSTRUCTURE[13, 14] to calculate the wavelength and A-values of K-shell lines for some medium-Z elements. [20] measured Kα transitions of silicon ions using EBIT-I electron beam ion trap at the Lawrence Livermore National Laboratory Few of the former works interpreted the line emission mechanism in detail.
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