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

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.

doi:10.1063/1.4938032

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

Journal Article · Mon Dec 21 00:00:00 EST 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4938032· OSTI ID:1373880

Zemedkun, Samuel E. ^[1]; Che, S. ^[2]; Chen, Y. ^[3]; ^[2]; Luhmann, Jr., Neville C. ^[2]; Munsat, Tobin ^[3]; Parker, Scott E. ^[3]; Tobias, Benjamin ^[4]; Wan, W. ^[3]; Yu, L. ^[2]

Univ. of Colorado, Boulder, CO (United States); General Atomics
Univ. of California, Davis, CA (United States)
Univ. of Colorado, Boulder, CO (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

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).

View Accepted Manuscript (DOE)

Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466; FC02-04ER54698; FG02-08ER54954; FG02-99ER54531; SC0003913

OSTI ID:: 1373880

Alternate ID(s):: OSTI ID: 1233878

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 12 Vol. 22; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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