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Title: Spatially resolved measurements of two-dimensional turbulent structures in DIII-D plasmas

Here, two-dimensional observations of spatially-coherent electron temperature fluctuations at drift wave scales (k ~1 cm -1) have been made using the electron cyclotron emission imaging (ECEI) diagnostic on the DIII-D tokamak. These measurements enable the extraction of spectral properties, including poloidal dispersion relations. Temperature fluctuation levels are found to be ˜ T e/< T e > = 1.2%, and the phase velocity of the fluctuations is found to be constant across frequencies, consistent with modes having real frequencies low compared to the rotation-induced Doppler shifts. Comparisons with radially global linear gyrokinetic simulations suggest that the observed modes may be trapped electron modes (TEM).
Authors:
 [1] ;  [2] ;  [1] ; ORCiD logo [2] ;  [2] ;  [1] ;  [1] ;  [3] ;  [1] ;  [2]
  1. Univ. of Colorado, Boulder, CO (United States)
  2. Univ. of California, Davis, CA (United States)
  3. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Grant/Contract Number:
FC02-04ER54698; AC02-09CH11466; FG02-08ER54954; FG02-99ER54531; SC0003913
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 12; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
General Atomics, San Diego, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1373880
Alternate Identifier(s):
OSTI ID: 1233878

Zemedkun, Samuel E., Che, S., Chen, Y., Domier, C. W., Luhmann, Jr., Neville C., Munsat, Tobin, Parker, Scott E., Tobias, Benjamin, Wan, W., and Yu, L.. Spatially resolved measurements of two-dimensional turbulent structures in DIII-D plasmas. United States: N. p., Web. doi:10.1063/1.4938032.
Zemedkun, Samuel E., Che, S., Chen, Y., Domier, C. W., Luhmann, Jr., Neville C., Munsat, Tobin, Parker, Scott E., Tobias, Benjamin, Wan, W., & Yu, L.. Spatially resolved measurements of two-dimensional turbulent structures in DIII-D plasmas. United States. doi:10.1063/1.4938032.
Zemedkun, Samuel E., Che, S., Chen, Y., Domier, C. W., Luhmann, Jr., Neville C., Munsat, Tobin, Parker, Scott E., Tobias, Benjamin, Wan, W., and Yu, L.. 2015. "Spatially resolved measurements of two-dimensional turbulent structures in DIII-D plasmas". United States. doi:10.1063/1.4938032. https://www.osti.gov/servlets/purl/1373880.
@article{osti_1373880,
title = {Spatially resolved measurements of two-dimensional turbulent structures in DIII-D plasmas},
author = {Zemedkun, Samuel E. and Che, S. and Chen, Y. and Domier, C. W. and Luhmann, Jr., Neville C. and Munsat, Tobin and Parker, Scott E. and Tobias, Benjamin and Wan, W. and Yu, L.},
abstractNote = {Here, two-dimensional observations of spatially-coherent electron temperature fluctuations at drift wave scales (k ~1 cm-1) have been made using the electron cyclotron emission imaging (ECEI) diagnostic on the DIII-D tokamak. These measurements enable the extraction of spectral properties, including poloidal dispersion relations. Temperature fluctuation levels are found to be ˜ Te/< Te > = 1.2%, and the phase velocity of the fluctuations is found to be constant across frequencies, consistent with modes having real frequencies low compared to the rotation-induced Doppler shifts. Comparisons with radially global linear gyrokinetic simulations suggest that the observed modes may be trapped electron modes (TEM).},
doi = {10.1063/1.4938032},
journal = {Physics of Plasmas},
number = 12,
volume = 22,
place = {United States},
year = {2015},
month = {12}
}