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Title: Quantitative comparisons of electron-scale turbulence measurements in NSTX via synthetic diagnostics for high-k scattering.

Abstract

Two synthetic diagnostics are implemented for the high-k scattering system in NSTX [D. R. Smith, E. Mazzucato, W. Lee, H. K. Park, C. W. Domier, and N. C. Luhmann Jr., Rev. Sci. Instrum., 79, 123501 (2008)] allowing direct comparisons between synthetic and experimentally detected frequency and wavenumber spectra of electron-scale turbulence fluctuations. Synthetic diagnostics were formulated in real-space and in wavenumber space, and were deployed to realistic electron-scale simulations carried out with the GYRO code [J. Candy and R. E. Waltz, J. Comput. Phys. 186 (2003) 545]. A highly unstable ETG regime (electron temperature gradient mode) in a modest beta NSTX NBI-heated H-mode discharge was chosen for the analysis. Mapping the measured wavenumbers to field aligned coordinates showed that the high-k system is sensitive to fluctuations that are closer to the spectral peak in the density fluctuation wavenumber spectrum (streamers) than originally predicted. Analysis of synthetic spectra show that the frequency response of the detected fluctuations is dominated by Doppler shift and insensitive to the turbulence drive. The shape of the high-k density fluctuation wavenumber spectrum is sensitive to the ETG turbulence drive conditions, and can be reproduced in a sensitivity scan of the most pertinent turbulent drive terms inmore » the simulation.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
DOE Contract Number:  
FG02-91ER54109; AC02-09CH11466; AC02-05CH11231
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1881488
DOI:
https://doi.org/10.7910/DVN/ENJUO0

Citation Formats

Ruiz, J. Ruiz, Guttenfelder, W., White, A. E., Howard, N. T., Candy, J., Ren, Y., Smith, D. R., and Holland, C. Quantitative comparisons of electron-scale turbulence measurements in NSTX via synthetic diagnostics for high-k scattering.. United States: N. p., 2020. Web. doi:10.7910/DVN/ENJUO0.
Ruiz, J. Ruiz, Guttenfelder, W., White, A. E., Howard, N. T., Candy, J., Ren, Y., Smith, D. R., & Holland, C. Quantitative comparisons of electron-scale turbulence measurements in NSTX via synthetic diagnostics for high-k scattering.. United States. doi:https://doi.org/10.7910/DVN/ENJUO0
Ruiz, J. Ruiz, Guttenfelder, W., White, A. E., Howard, N. T., Candy, J., Ren, Y., Smith, D. R., and Holland, C. 2020. "Quantitative comparisons of electron-scale turbulence measurements in NSTX via synthetic diagnostics for high-k scattering.". United States. doi:https://doi.org/10.7910/DVN/ENJUO0. https://www.osti.gov/servlets/purl/1881488. Pub date:Thu Jun 18 00:00:00 EDT 2020
@article{osti_1881488,
title = {Quantitative comparisons of electron-scale turbulence measurements in NSTX via synthetic diagnostics for high-k scattering.},
author = {Ruiz, J. Ruiz and Guttenfelder, W. and White, A. E. and Howard, N. T. and Candy, J. and Ren, Y. and Smith, D. R. and Holland, C.},
abstractNote = {Two synthetic diagnostics are implemented for the high-k scattering system in NSTX [D. R. Smith, E. Mazzucato, W. Lee, H. K. Park, C. W. Domier, and N. C. Luhmann Jr., Rev. Sci. Instrum., 79, 123501 (2008)] allowing direct comparisons between synthetic and experimentally detected frequency and wavenumber spectra of electron-scale turbulence fluctuations. Synthetic diagnostics were formulated in real-space and in wavenumber space, and were deployed to realistic electron-scale simulations carried out with the GYRO code [J. Candy and R. E. Waltz, J. Comput. Phys. 186 (2003) 545]. A highly unstable ETG regime (electron temperature gradient mode) in a modest beta NSTX NBI-heated H-mode discharge was chosen for the analysis. Mapping the measured wavenumbers to field aligned coordinates showed that the high-k system is sensitive to fluctuations that are closer to the spectral peak in the density fluctuation wavenumber spectrum (streamers) than originally predicted. Analysis of synthetic spectra show that the frequency response of the detected fluctuations is dominated by Doppler shift and insensitive to the turbulence drive. The shape of the high-k density fluctuation wavenumber spectrum is sensitive to the ETG turbulence drive conditions, and can be reproduced in a sensitivity scan of the most pertinent turbulent drive terms in the simulation.},
doi = {10.7910/DVN/ENJUO0},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {6}
}

Works referencing / citing this record:

Quantitative comparisons of electron-scale turbulence measurements in NSTX via synthetic diagnostics for high- k scattering
journal, May 2020