Identification of trapped electron modes in frequency fluctuation spectra
- Arnichand, Hugo
- Citrin, J
- Hacquin, S
- Sabot, R
- Krämer-Flecken, A
- Garbet, X
- Bourdelle, C
- Clairet, F
- Giacalone, JC
- Guimaraes-Filho, ZO
- Guirlet, R
- Hornung, Grégoire
- Lebschy, A
- Lotte, P
- Maget, P
- Medvedeva, A
- Molina, D
- Nikolaeva, V
- Prisiazhniuk, D
DOIAbstract
Ion temperature gradient (ITG) and trapped electron modes (TEM) are two important micro-instabilities in the plasma core region of fusion devices (r/a <= 0.9). They usually coexist in the same range of spatial scale (around 0.1 < k(perpendicular to)rho(i)<1), 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 fluctuat...
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