Deduction of central plasma parameters from line-of-sight averaged spectroscopic observationsFunded under: FP2-FUSION 10C
A method is presented to deduce central ion temperature and toroidal rotation velocity from line-of-sight averaged X-ray spectra from hot plasmas. The analysis is based on atomic data for the processes that give rise to X-ray spectral lines. Combined with measured electron temperature and density profiles, a synthetic spectrum is calculated. The fit of this synthetic spectrum to the observed one gives a new level of accuracy to line-of-sight integrated observations in a considerably extended range of ion temperatures and toroidal rotation velocities. The choice of model for radial profiles for ion temperature and toroidal rotation velocity is not critical. The concentration of the emitting impurity is deduced from the total line intensity, making use of the absolute calibration of the detector sensitivity. The average plasma charge Z(eff) is derived from the absolute level of the continuum radiation. The results for ion temperature and toroidal rotation velocity are compared with those from visible charge exchange spectroscopy. The observed visible lines are shifted in wavelength and their width is reduced. When the results from visible charge exchange spectroscopy are corrected for the cross section effects, excellent agreement between both methods is obtained.
Bibliographic Reference: Report: JET-P(90)18 EN (1990) 29 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199110631 / Last updated on: 1994-12-02
Original language: en
Available languages: en