We present the △n = 0 (n = 3 to n = 3) EUV spectra of M-shell iron ions from a tokamak plasma obtained during the "ramp-down" phase of the discharge. The fractional ion abundances for K-like Fe+7to Si-like Fe+12are found from fitting model spectra to the measured spectrum. The plasma temperature is measured as a function of position by Thomson scattering of laser light and Langmuir probes. Collisional-radiative simulations have been computed for the above ions, using atomic data generated with the HULLAC suite of codes. The blended M-shell spectrum is strongly sensitive to temperature; this makes it a potentially useful diagnostic for observations of stellar coronae where the differential emission measure is dominated by temperatures around 1 MK.
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science
Fournier, K. B., Finkenthal, M., Pacella, D., May, M. J., Leigheb, M., Soukhanovskii, V., & Goldstein, W. H. (2001). Measurement of M-shell iron ionization balance in a tokamak plasma. Astrophysical Journal, 550(1 PART 2), -. https://doi.org/10.1086/319483