Recent Transport Experiments in W7-AS
| Autor: | W AS-Team, Ulrich Stroth, ECRH-Group, G. Kuehner, M. Hirsch, L. Giannone, H. Ringler, V. Erckmann, Friedrich E. Wagner, M. Kick, J. Baldzuhn, H. J. Hartfuss |
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| Rok vydání: | 1995 |
| Předmět: |
Electron density
Materials science 020209 energy Transport coefficient General Engineering 02 engineering and technology Plasma Thermal diffusivity 01 natural sciences 010305 fluids & plasmas Power (physics) Power Balance 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Plasma parameter Electron temperature Atomic physics |
| Zdroj: | Fusion Technology. 27:169-177 |
| ISSN: | 0748-1896 |
| DOI: | 10.13182/fst95-a11947062 |
| Popis: | Parameter scans in density, heating power and isotope mass have been carried out in W7-AS. ECRH at a frequency of 140 GHz has allowed one to study the density scaling of the energy confinement time of ECRH plasmas up to densities of 10{sup 20}m{sup -3}. In power scans it has been tried to relate the power degradation of the energy confinement to a local plasma parameter. Transport analyses using power balance and heat wave techniques indicate that the transport coefficient does not depend on the electron temperature or related parameters. This observation can be reconciled with power degradation if the transport coefficient is formally allowed to vary with changes in the heating power on a faster than the diffusive time scale. Such a transport process describes also the observations in the dynamic phases following large changes in the heating power. 7 refs., 18 figs. |
| Databáze: | OpenAIRE |
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