Short wavelength turbulence generated by shear in the quiescent H-mode edge on DIII–D [Short wavelength turbulence generated by shear in the QH-mode edge on DIII-D]

Rost, Jon C.; Porkolab, Miklos; Dorris, James R.; Burrell, Keith H.

doi:10.1063/1.4883135

Title: Short wavelength turbulence generated by shear in the quiescent H-mode edge on DIII–D [Short wavelength turbulence generated by shear in the QH-mode edge on DIII-D]

Journal Article · Tue Jun 17 00:00:00 EDT 2014 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4883135· OSTI ID:1354815

Rost, Jon C. ^[1]; Porkolab, Miklos ^[1]; Dorris, James R. ^[1]; Burrell, Keith H. ^[2]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
General Atomics, San Diego, CA (United States)

A region of turbulence with large radial wavenumber (k_rρ_s > 1) is found in the high-shear portion of the plasma edge in Quiescent H-mode (QH-mode) on DIII{D using the Phase Contrast Imaging (PCI) diagnostic. At its peak outside the minimum of the E_r well, the turbulence exhibits large amplitude $$\tilde{n}$$/n ~ 40%, with large radial wavenumber |$$\bar{k}$$_r/ $$\bar{k}$$_θ| ~ 11 and short radial correlation length L_r/ρ _i ~ 0.2. The turbulence inside the E_r well minimum is characterized by the opposite sign in radial wavenumber from that of turbulence outside the minimum, consistent with the expected effects of velocity shear. The PCI diagnostic provides a line-integrated measurement of density uctuations, so data is taken during a scan of plasma position at constant parameters to allow the PCI to sample a range in k_r/k_θ . Analysis of the Doppler Shift and plasma geometry allows the turbulence to be localized to a narrow region 3 mm inside the last closed flux surface (LCFS), outside the minimum of the E_r well. The turbulence amplitude and radial wavenumber and correlation length are determined by fitting the PCI results with a simple non-isotropic turbulence model with two regions of turbulence. Finally, these PCI observations, made in QH-mode, are qualitatively similar to those made in standard ELM-free H-mode and between edge localized modes (ELMs), suggesting a similar role for large k_r turbulence there.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: FC02-04ER54698

OSTI ID:: 1354815

Journal Information:: Physics of Plasmas, Vol. 21, Issue 6; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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References (22)

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Cited By (3)

Physics of increased edge electron temperature and density turbulence during ELM-free QH-mode operation on DIII-D Sung, C.; Rhodes, T. L.; Staebler, G. M. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5017964	journal	May 2018
A combined phase contrast imaging and heterodyne interferometer system for multiscale fluctuation measurements (invited) Davis, E. M.; Rost, J. C.; Porkolab, M. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5035413	journal	October 2018
H-mode grade confinement in L-mode edge plasmas at negative triangularity on DIII-D Marinoni, A.; Austin, M. E.; Hyatt, A. W. Physics of Plasmas, Vol. 26, Issue 4 https://doi.org/10.1063/1.5091802	journal	April 2019

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