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

Ruiz Ruiz, J.; Guttenfelder, W.; White, A. E.; Howard, N. T.; Candy, J.; Ren, Y.; Smith, D. R.; Holland, C.

doi:10.1088/1361-6587/ab82de

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

Journal Article · Fri May 22 00:00:00 EDT 2020 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/ab82de· OSTI ID:1630458

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; White, A. E.;

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; Ren, Y.; Smith, D. R.; Holland, C.

Two synthetic diagnostics are implemented for the high-k scattering system in NSTX (Smith et al 2008 Rev. Sci. Instrum. 79 123501) allowing direct comparisons between the synthetic and experimentally detected frequency and wavenumber spectra of electron-scale turbulence fluctuations. Synthetic diagnostics are formulated in real-space and in wavenumber space, and are deployed in realistic electron-scale simulations carried out with the GYRO code (Candy and Waltz 2003 J. Comput. Phys. 186 545). A highly unstable electron temperature gradient (ETG) mode regime in a modest-β NSTX NBI-heated H-mode discharge is chosen for the analysis. Mapping the measured wavenumbers to field aligned coordinates shows 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. The analyses of synthetic spectra show that the frequency response of the detected fluctuations is dominated by Doppler shift and is 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.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-91-ER54109; AC02-09CH11466

OSTI ID:: 1630458

Alternate ID(s):: OSTI ID: 1630459; OSTI ID: 1642950

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Vol. 62 Journal Issue: 7; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United Kingdom

Language:: English

Citation Metrics:

Cited by: 7 works

Citation information provided by
Web of Science

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