Measurements of plasma composition in the TEXTOR tokamak by collective Thomson scattering

TitleMeasurements of plasma composition in the TEXTOR tokamak by collective Thomson scattering
Publication TypeJournal Article
Year of Publication2012
AuthorsM. Stejner, S.B Korsholm, S.K. Nielsen, M. Salewski, H. Bindslev, S. Brezinsek, V. Furtula, F. Leipold, P.K Michelsen, F. Meo, D. Moseev, A. Burger, M. Kantor, MR de Baar
JournalPlasma Physics and Controlled Fusion
Volume54
Issue1
Pagination015008
Date PublishedJan
Type of ArticleArticle; Proceedings Paper
ISBN Number0741-3335
Keywordsdiagnostics, ION-TEMPERATURE-MEASUREMENT, LASER SCATTERING, RADIATION, SCENARIOS, WAVES
Abstract

We demonstrate the use of collective Thomson scattering (CTS) for spatially localized measurements of the isotopic composition of magnetically confined fusion plasmas. The experiments were conducted in the TEXTOR tokamak by scattering millimeter-wave probe radiation off plasma fluctuations with wave vector components nearly perpendicular to the magnetic field. Under such conditions the sensitivity of the CTS spectrum to plasma composition is enhanced by the spectral signatures of the ion cyclotron motion and of weakly damped ion Bernstein waves. Recent experiments on TEXTOR demonstrated the ability to resolve these signatures in the CTS spectrum as well as their sensitivity to the ion species mix in the plasma. This paper shows that the plasma composition can be inferred from the measurements through forward modeling of the CTS spectrum. We demonstrate that spectra measured in plasmas consisting of hydrogen, deuterium and (3)He can be accurately reproduced by theory and yield inferred plasma compositions consistent with expectations. The potential to use CTS for measurements of plasma composition is of significant interest since CTS is well suited for reactor environments and since there is at present no established method to measure the fuel ion density ratio in the core of a burning fusion plasma.

DOI10.1088/0741-3335/54/1/015008
Division

FP

Department

PDG

PID

44bb7848240e89f8394b5e6254e79db4

Alternate TitlePlasma Phys. Control. Fusion

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