Measurement of M-Shell Iron Ionization Balance in a Tokamak Plasma

Details Measurement of M-Shell Iron Ionization Balance in a Tokamak Plasma Measurement of M-Shell Iron Ionization Balance in a Tokamak Plasma

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...550l.117f&link_type=abstract

The Astrophysical Journal, Volume 550, Issue 1, pp. L117-L120.

Astronomy and Astrophysics

Astronomy

5

Atomic Data, Methods: Laboratory, Stars: Coronae, Ultraviolet: Stars

Scientific paper

We present the Δn=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+7 to Si-like Fe+12 are 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.

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