Identification of trapped electron modes in frequency fluctuation spectra
| Autor: | Arnichand, H., Citrin, J., Hacquin, S., Sabot, R., Kramer-Flecken, A., Garbet, X., Bourdelle, C., Bottereau, C., Clairet, F., Giacalone, J.C., Guimaraes-Filho, Z.O., Guirlet, R., Hornung, G., Lebschy, A., Lotte, P., Maget, P., Medvedeva, A., Molina, D., Nikolaeva, V., Prisiazhniuk, D., team, ToreSupra, Team, ASDEXUpgrade |
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| Přispěvatelé: | Tore Supra Team, ASDEX Upgrade Team, Max Planck Institute for Plasma Physics, Max Planck Society |
| Jazyk: | angličtina |
| Předmět: |
Physics
business.industry Plasma Electron Tore Supra Condensed Matter Physics 01 natural sciences Instability Spectral line 010305 fluids & plasmas Computational physics Condensed Matter::Materials Science Optics Nuclear Energy and Engineering Physics::Plasma Physics 0103 physical sciences Phase velocity Magnetohydrodynamics 010306 general physics Reflectometry business |
| Zdroj: | Plasma Physics and Controlled Fusion Plasma Physics and Controlled Fusion, 58, 014037 |
| ISSN: | 1361-6587 0741-3335 0029-5515 1367-2630 1536-1055 |
| DOI: | 10.1088/0741-3335/58/1/014037 |
| Popis: | Ion temperature gradient (ITG) and trapped electron modes (TEM) are two important micro-instabilities in the plasma core region of fusion devices (). They usually coexist in the same range of spatial scale (around ), which makes their discrimination difficult. To investigate them, one can perform gyrokinetic simulations, transport analysis and phase velocity estimations. In Tore Supra, the identification of trapped electron modes (TEM) is made possible due to measured frequency fluctuation spectra. Indeed, turbulent spectra generally expected to be broad-band, can become narrow in case of TEM turbulence, inducing 'quasi-coherent' (QC) modes named QC-TEM. Therefore the analysis of frequency fluctuation spectra becomes a possible tool to differentiate TEM from ITG. We have found indications that the TEM can have a QC signature by comparing frequency fluctuation spectra from reflectometry measurements, gyrokinetic simulations and synthetic diagnostic results. Then the scope of the analysis of QC-TEM are discussed and an application is shown, namely transitions between TEM turbulence and MHD fluctuations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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