Z{sub eff} from spectroscopic bremsstrahlung measurements at ASDEX Upgrade and JET
- Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, Boltzmannstr. 2, D-85748 Garching (Germany)
The effective ionic charge Z{sub eff} is a means to assess the impurity content of a fusion plasma. It can be derived from measurements of bremsstrahlung intensity. These have been extended at ASDEX Upgrade by the usage of the sight lines for the charge exchange recombination diagnostic. Together with a previously installed sight line array, it is now possible to routinely determine the bremsstrahlung intensity over the whole minor radius purely from spectroscopic measurements. In a tokamak where the plasma facing components are made up of various materials, this is necessary to check if measurements are contaminated by line radiation. The bremsstrahlung background of the respective spectra is determined using Bayesian probability theory, giving consistent and improved error statistics. Using the information for electron temperature and density profiles, the Z{sub eff} profile is determined by an integrated method. The same approach to assess the Z{sub eff} profile has been demonstrated to be successful also at the JET tokamak.
- OSTI ID:
- 20641241
- Journal Information:
- Review of Scientific Instruments, Vol. 75, Issue 10; Conference: 15. topical conference on high temperature plasma diagnostics, San Diego, CA (United States), 19-22 Apr 2004; Other Information: DOI: 10.1063/1.1787167; (c) 2004 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ASDEX Upgrade Team; JET-EFDA Contributors; ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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