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  4. Electron temperature fluctuation measurements with Correlation Electron Cyclotron Emission in L-mode and I-mode plasmas at ASDEX Upgrade
 
conference paper

Electron temperature fluctuation measurements with Correlation Electron Cyclotron Emission in L-mode and I-mode plasmas at ASDEX Upgrade

Bielajew, Rachel
•
Conway, Garrard D.
•
Happel, Tim
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January 1, 2023
21St Joint Workshop On Electron Cyclotron Emission And Electron Cyclotron Resonance Heating, Ec21
21st Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating (EC)

The Correlation Electron Cyclotron Emission (CECE) diagnostic at ASDEX Upgrade (AUG) is used to investigate the features of outer core and pedestal (rho(pol) = 0.85-1.0) turbulence across confinement regime transitions. The I-mode confinement regime is a promising operational scenario for future fusion reactors because it features high energy confinement without high particle confinement, but the nature of the edge and pedestal turbulence in I-mode plasmas is still under investigation. The edge Weakly Coherent Mode (WCM) appears in the I-mode pedestal and may play a role in transport. In this work we explore electron temperature (T-e) fluctuations in the plasma outer core and pedestal using a 24-channel high radial resolution CECE radiometer. CECE measurements provide turbulence information including the Te fluctuation amplitude, turbulent spectra, and radial localization of turbulent features. With CECE measurements we show that the WCM is localized in the pedestal region in both L-mode and I-mode and is measured in optically thick plasmas with a T-e fluctuation amplitude of 2.3%. Broadband drift wave turbulence is measured in the outer core with a T-e fluctuation amplitude of <1%. A second CECE system recently installed at AUG allowed for non-standard fluctuation measurements during L-mode and I-mode experiments. The second CECE system was toroidally separated from the primary system, allowing measurements of the long-range toroidal correlation of the WCM indicating its low toroidal mode number. A reflectometer sharing a line of sight with the second CECE system enabled density-temperature cross-phase (alpha T-ne(e)) measurements. The WCM alpha T-ne(e) changes between L-mode and I-mode as the T-e gradient steepens.

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Type
conference paper
DOI
10.1051/epjconf/202327703002
Web of Science ID

WOS:001006603800023

Author(s)
Bielajew, Rachel
•
Conway, Garrard D.
•
Happel, Tim
•
Hoefler, Klara
•
Cabrera, Pedro A. Molina  
•
Plank, Ulrike
•
Rodriguez-Fernandez, Pablo
•
Silvagni, Davide
•
Vanovac, Branka
•
Yoo, Christian
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Date Issued

2023-01-01

Publisher

E D P SCIENCES

Publisher place

Cedex A

Published in
21St Joint Workshop On Electron Cyclotron Emission And Electron Cyclotron Resonance Heating, Ec21
Series title/Series vol.

EPJ Web of Conferences

Volume

277

Start page

03002

Subjects

Nuclear Science & Technology

•

Physics, Fluids & Plasmas

•

Nuclear Science & Technology

•

Physics

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SPC  
Event nameEvent placeEvent date
21st Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating (EC)

Cadarache, FRANCE

Jun 20-24, 2022

Available on Infoscience
July 17, 2023
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/199167
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