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Deduction of central plasma parameters from line‐of‐sight averaged spectroscopic observations
KTH, Superseded Departments, Physics.ORCID iD: 0000-0001-7389-5501
1991 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 70, 6732- p.Article in journal (Refereed) Published
Abstract [en]

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 shown not to be 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 effective plasma charge ZeE is derived from the absolute level of the

continuum radiation. These measurements are based on atomic data for x-ray line and

continuum radiation and measured electron temperature and density profiles. The results for

ion temperature and toroidal rotation velocity obtained by this analysis are compared

with those from visible charge exchange spectroscopy. The observed visible lines are shifted

in wavelength, and their width is reduced, due to the velocity dependence of the cross

section for the charge transfer from the neutral beam particles to the observed impurities. The

theoretically predicted magnitude of these effects is verified. When the results from

visible charge exchange spectroscopy are corrected for the cross-section effects, excellent

agreement of central ion temperature and rotation velocity with the results of this new analysis is obtained

Place, publisher, year, edition, pages
AIP, 1991. Vol. 70, 6732- p.
National Category
Natural Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:kth:diva-182812OAI: oai:DiVA.org:kth-182812DiVA: diva2:905822
Available from: 2016-02-23 Created: 2016-02-23 Last updated: 2016-02-24Bibliographically approved

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Rachlew (Källne), Elisabeth
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