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Discriminating the trapped electron modes contribution in density fluctuation spectra

(2015) NUCLEAR FUSION. 55(9).
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Abstract
Quasi-coherent (QC) modes have been reported for more than 10 years in reflectometry fluctuations spectra in the core region of fusion plasmas. They have characteristics in-between coherent and broadband fluctuations as they oscillate at a marked frequency but have a wide spectrum. This work presents further evidences of the link recently established between QC modes and the trapped electron modes (TEM) instabilities (Arnichand et al 2014 Nucl. Fusion 54 123017). In electron cyclotron resonance heated discharges of Tore Supra, an enhancement of QC modes amplitude is observed in a region where TEM cause impurity transport and turbulence. In JET Ohmic plasmas, QC modes disappear during density ramp-up and current ramp-down. This is reminiscent of Tore Supra and TEXTOR observations during transitions from the linear Ohmic confinement (LOC) to the saturated Ohmic confinement (SOC) regimes. Evidencing TEM activity then becomes experimentally possible via analysis of fluctuation spectra.
Keywords
DOPPLER REFLECTOMETRY, ALCATOR C-MOD, ENERGY CONFINEMENT, OHMIC DISCHARGES, TORE-SUPRA, TURBULENCE, TOKAMAK, TRANSPORT, PLASMAS, PROFILE, turbulence, micro-instabilities, trapped electron modes, electron cyclotron resonance heating, ohmic confinement, reflectometry

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Citation

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Chicago
Arnichand, Hugo, R Sabot, S Hacquin, A Krämer-Flecken, C Bourdelle, J Citrin, X Garbet, et al. 2015. “Discriminating the Trapped Electron Modes Contribution in Density Fluctuation Spectra.” Nuclear Fusion 55 (9).
APA
Arnichand, H., Sabot, R., Hacquin, S., Krämer-Flecken, A., Bourdelle, C., Citrin, J., Garbet, X., et al. (2015). Discriminating the trapped electron modes contribution in density fluctuation spectra. NUCLEAR FUSION, 55(9).
Vancouver
1.
Arnichand H, Sabot R, Hacquin S, Krämer-Flecken A, Bourdelle C, Citrin J, et al. Discriminating the trapped electron modes contribution in density fluctuation spectra. NUCLEAR FUSION. 2015;55(9).
MLA
Arnichand, Hugo et al. “Discriminating the Trapped Electron Modes Contribution in Density Fluctuation Spectra.” NUCLEAR FUSION 55.9 (2015): n. pag. Print.
@article{6997996,
  abstract     = {Quasi-coherent (QC) modes have been reported for more than 10 years in reflectometry fluctuations spectra in the core region of fusion plasmas. They have characteristics in-between coherent and broadband fluctuations as they oscillate at a marked frequency but have a wide spectrum. This work presents further evidences of the link recently established between QC modes and the trapped electron modes (TEM) instabilities (Arnichand et al 2014 Nucl. Fusion 54 123017). In electron cyclotron resonance heated discharges of Tore Supra, an enhancement of QC modes amplitude is observed in a region where TEM cause impurity transport and turbulence. In JET Ohmic plasmas, QC modes disappear during density ramp-up and current ramp-down. This is reminiscent of Tore Supra and TEXTOR observations during transitions from the linear Ohmic confinement (LOC) to the saturated Ohmic confinement (SOC) regimes. Evidencing TEM activity then becomes experimentally possible via analysis of fluctuation spectra.},
  articleno    = {093021},
  author       = {Arnichand, Hugo and Sabot, R and Hacquin, S and Krämer-Flecken, A and Bourdelle, C and Citrin, J and Garbet, X and Giacalone, JC and Guirlet, R and Hillesheim, JC and Meneses, L},
  issn         = {0029-5515},
  journal      = {NUCLEAR FUSION},
  keywords     = {DOPPLER REFLECTOMETRY,ALCATOR C-MOD,ENERGY CONFINEMENT,OHMIC DISCHARGES,TORE-SUPRA,TURBULENCE,TOKAMAK,TRANSPORT,PLASMAS,PROFILE,turbulence,micro-instabilities,trapped electron modes,electron cyclotron resonance heating,ohmic confinement,reflectometry},
  language     = {eng},
  number       = {9},
  pages        = {10},
  title        = {Discriminating the trapped electron modes contribution in density fluctuation spectra},
  url          = {http://dx.doi.org/10.1088/0029-5515/55/9/093021},
  volume       = {55},
  year         = {2015},
}

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