Electron-density-sensitive Line Ratios of Fe XIII--XVI from Laboratory Sources Compared to CHIANTI

Dataset · Thu Feb 01 00:00:00 EST 2018

DOI:https://doi.org/10.11578/1562038· OSTI ID:1562038

Weller, M E; Beiersdorfer, P; Soukhanovskii, V A; Scotti, F; LeBlanc, B P

We present electron-density-sensitive line ratios for Fe XIII–XVI measured in the spectral wavelength range of 200–440 Å and an electron density range of (1–4)×10¹³ cm^-3. The results provide a test at the high-density limit of density-sensitive line ratios useful for astrophysical studies. The measurements were performed on the National Spherical Torus Experiment-Upgrade, where electron densities were measured independently by the laser Thomson scattering diagnostic. Spectra were collected with a flat-field grazing-incidence spectrometer, which provided a spectral resolution of up to 0.3 Å, i.e., high resolution across the broad wavelength range. The response of the instrument was relatively calibrated using spectroscopic techniques in order to improve accuracy. The line ratios are compared to other laboratory sources and the latest version of CHIANTI (8.0.2), and an agreement within 30% is found.

• Research Organization: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: U. S. Department of Energy
• DOE Contract Number: AC02-09CH11466
• OSTI ID: 1562038
• Country of Publication: United States
• Language: English

Related Subjects

Spectroscopic techniques