Microwave reflectometry for turbulence studies on ASDEX upgrade (abstract)
| Autor: | F. Serra, S. Vergamota, G. D. Conway, F. Ryter, A. Silva, L. Cupido, W. Suttrop, T. T. Ribeiro, M. E. Manso |
|---|---|
| Rok vydání: | 2001 |
| Předmět: | |
| Zdroj: | Review of Scientific Instruments. 72:319-319 |
| ISSN: | 1089-7623 0034-6748 |
| DOI: | 10.1063/1.1323468 |
| Popis: | The reflectometry system installed in the tokamak ASDEX Upgrade has 11 channels primarily aimed at profile measurements and two dedicated channels operating at fixed frequency to study density fluctuations. The channels used for profile measurements can also be operated at fixed frequency. In this article we describe the potential of the system to study important characteristics of the plasma turbulence, from combined fixed frequency and profile measurements (to localize the reflecting layers). The numerical tools used to treat fixed frequency data are briefly described. Using a set of similar discharges and the ability of the microwave reflectometry system to probe simultaneously different layers with several channels, we obtain the time evolution of the integrated power spectra of the different signals versus the minor radius of the plasma. In plasma with H-mode edge and internal transport barrier we could identify a zone at the plasma core and another at the edge with reduced fluctuation levels, coinci... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|