Edge density profile studies in the CASTOR tokamak using a thermal lithium beam
| Autor: | J. Stoeckel, M. Valovic, L. Weixelbaum, K. Guenther, F. Zacek, U. Wenzel, E. Hayess, K. Jakubka, J. Badalec, K.H. Krebs |
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| Rok vydání: | 1989 |
| Předmět: |
Nuclear and High Energy Physics
Electron density Tokamak Chemistry chemistry.chemical_element Plasma law.invention symbols.namesake Nuclear Energy and Engineering Physics::Plasma Physics law Electric field symbols Langmuir probe General Materials Science Plasma diagnostics Lithium Atomic physics Beam (structure) |
| Zdroj: | Journal of Nuclear Materials. :562-567 |
| ISSN: | 0022-3115 |
| DOI: | 10.1016/0022-3115(89)90328-0 |
| Popis: | The plasma edge of the CASTOR tokamak was investigated using a thermal lithium beam and electrical probes. The density profiles in the scrape-off layer (SOL) obtained by means of the lithium beam technique clearly reflect the particular limiter configuration and allow the evaluation in terms of D⊥. These profiles are in good agreement with simultaneous Langmuir probe measurements at different radii. In discharges with additional lower hybrid current drive (OH/LHCD) steeper profiles are obtained, which indicates a reduced radial particle transport. This is supported by the evaluation of fluctuation measurements (density and poloidal electric field) in terms of the turbulent radial particle flux, and by a reduced temporal decay of the line-averaged density during RF. Thus, in effect LHCD improves the particle confinement. |
| Databáze: | OpenAIRE |
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