Collisional-Radiative Modelling of Fe L-shell Emission For Interpreting Astrophysical and Magnetic Confinement Plasma Experiments

Details Collisional-Radiative Modelling of Fe L-shell Emission For Interpreting Astrophysical and Magnetic Confinement Plasma Experiments Collisional-Radiative Modelling of Fe L-shell Emission For Interpreting Astrophysical and Magnetic Confinement Plasma Experiments

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..dppcp1081g&link_type=abstract

American Physical Society, 42nd Annual Meeting of the APS Division of Plasma Physics combined with the 10th International Congre

Physics

Plasma Physics

Scientific paper

Iron has been introduced into Ohmically heated and current ramp-down discharges in the Frascati Tokamak Upgrade (FTU) plasma via the laser blow-off technique. Collisional-radiative models of density and temperature sensitive line ratios in several iron ions have been tested against photometrically calibrated measurements. Thus, a database is created that can be incorporated into astrophysical modelling codes. A self-consistent simulation of the L-shell Δn=0 (2-2) spectrum in the 80 to 140 Åregion is used to validate ionization equilibrium calculations. Spatially scannable and time resolving spectrometers have been used to measure the emissivity profiles of strong XUV transition from all L-shell iron ions (Fe^23+ to Fe^17+). The measured profiles are used to map out regions of radically different transport in the FTU ramp-down plasmas. The implications of these measurements for high resolution spectroscopy of astrophysical targets are discussed. This work was performed under the auspices of the U.S. Department of Energy by University of California Lawrence Livermore National Laboratory under contract No. W-7405-Eng-48.

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