Observation of quasi-coherent edge fluctuations in Ohmic plasmas on National Spherical Torus Experiment

Banerjee, Santanu; Diallo, A.; Zweben, S. J.

doi:10.1063/1.4946871

Title: Observation of quasi-coherent edge fluctuations in Ohmic plasmas on National Spherical Torus Experiment

Authors:

Banerjee, Santanu ^[1]; Diallo, A. ^[2];

^[2]

Institute for Plasma Research, Bhat, Gandhinagar 382428, Gujarat, India
Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA

Publication Date:: Wed Apr 20 00:00:00 EDT 2016

Sponsoring Org.:: USDOE

OSTI Identifier:: 1248240

Grant/Contract Number:: AC02-09CH11466

Resource Type:: Publisher's Accepted Manuscript

Journal Name:: Physics of Plasmas

Additional Journal Information:: Journal Name: Physics of Plasmas Journal Volume: 23 Journal Issue: 4; Journal ID: ISSN 1070-664X

Publisher:: American Institute of Physics

Country of Publication:: United States

Language:: English

Citation Formats


                    Banerjee, Santanu, Diallo, A., and Zweben, S. J. Observation of quasi-coherent edge fluctuations in Ohmic plasmas on National Spherical Torus Experiment.  United States: N. p., 2016. 
Web.  doi:10.1063/1.4946871.

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                    Banerjee, Santanu, Diallo, A., & Zweben, S. J. Observation of quasi-coherent edge fluctuations in Ohmic plasmas on National Spherical Torus Experiment.  United States.  https://doi.org/10.1063/1.4946871

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                    Banerjee, Santanu, Diallo, A., and Zweben, S. J. Wed .  
"Observation of quasi-coherent edge fluctuations in Ohmic plasmas on National Spherical Torus Experiment".  United States.  https://doi.org/10.1063/1.4946871.

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@article{osti_1248240,

  title        = {Observation of quasi-coherent edge fluctuations in Ohmic plasmas on National Spherical Torus Experiment},

  author       = {Banerjee, Santanu and Diallo, A. and Zweben, S. J.},

  abstractNote = {},

  doi          = {10.1063/1.4946871},

  journal      = {Physics of Plasmas},

  number       = 4,

  volume       = 23,

  place        = {United States},

  year         = {Wed Apr 20 00:00:00 EDT 2016},

  month        = {Wed Apr 20 00:00:00 EDT 2016}

}

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https://doi.org/10.1063/1.4946871

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Works referenced in this record:

New insights on boundary plasma turbulence and the quasi-coherent mode in Alcator C-Mod using a Mirror Langmuir Probe
journal, May 2014

LaBombard, B.; Golfinopoulos, T.; Terry, J. L.
Physics of Plasmas, Vol. 21, Issue 5
DOI: 10.1063/1.4873918

Correlations between quasi-coherent fluctuations and the pedestal evolution during the inter-edge localized modes phase on DIII-Da)
journal, May 2015

Diallo, A.; Groebner, R. J.; Rhodes, T. L.
Physics of Plasmas, Vol. 22, Issue 5
DOI: 10.1063/1.4921148

An overview of recent physics results from NSTX
journal, March 2015

Kaye, S. M.; Abrams, T.; Ahn, J. -W.
Nuclear Fusion, Vol. 55, Issue 10
DOI: 10.1088/0029-5515/55/10/104002

Quasi-coherent fluctuations limiting the pedestal growth on Alcator C-Mod: experiment and modelling
journal, April 2015

Diallo, A.; Hughes, J. W.; Baek, S-G.
Nuclear Fusion, Vol. 55, Issue 5
DOI: 10.1088/0029-5515/55/5/053003

Observation of Edge Instability Limiting the Pedestal Growth in Tokamak Plasmas
journal, March 2014

Diallo, A.; Hughes, J. W.; Greenwald, M.
Physical Review Letters, Vol. 112, Issue 11
DOI: 10.1103/PhysRevLett.112.115001

Modeling the effect of lithium-induced pedestal profiles on scrape-off-layer turbulence and the heat flux width
journal, September 2015

Russell, D. A.; D'Ippolito, D. A.; Myra, J. R.
Physics of Plasmas, Vol. 22, Issue 9
DOI: 10.1063/1.4930285

Observation of a quasicoherent mode in the Texas Experimental Tokamak
journal, April 1993

Tsui, H. Y. W.; Schoch, P. M.; Wootton, A. J.
Physics of Fluids B: Plasma Physics, Vol. 5, Issue 4
DOI: 10.1063/1.860918

Flow and shear behavior in the edge and scrape-off layer of L-mode plasmas in National Spherical Torus Experiment
journal, January 2011

Sechrest, Y.; Munsat, T.; D’Ippolito, D. A.
Physics of Plasmas, Vol. 18, Issue 1
DOI: 10.1063/1.3533435

New Fluctuation Phenomena in the $H$ -Mode Regime of Poloidal-Diverter Tokamak Plasmas
journal, August 1984

Slusher, R. E.; Surko, C. M.; Valley, J. F.
Physical Review Letters, Vol. 53, Issue 7
DOI: 10.1103/PhysRevLett.53.667

New Edge Coherent Mode Providing Continuous Transport in Long-Pulse H-mode Plasmas
journal, May 2014

Wang, H. Q.; Xu, G. S.; Wan, B. N.
Physical Review Letters, Vol. 112, Issue 18
DOI: 10.1103/PhysRevLett.112.185004

Edge and SOL turbulence and blob variations over a large database in NSTX
journal, September 2015

Zweben, S. J.; Davis, W. M.; Kaye, S. M.
Nuclear Fusion, Vol. 55, Issue 9
DOI: 10.1088/0029-5515/55/9/093035

Intrinsic rotation generation in NSTX ohmic H-mode plasmas
journal, May 2013

Park, Jong-Kyu; Bell, Ronald E.; Kaye, Stanley M.
Nuclear Fusion, Vol. 53, Issue 6
DOI: 10.1088/0029-5515/53/6/063012

Discriminating the trapped electron modes contribution in density fluctuation spectra
journal, August 2015

Arnichand, H.; Sabot, R.; Hacquin, S.
Nuclear Fusion, Vol. 55, Issue 9
DOI: 10.1088/0029-5515/55/9/093021

Drift wave versus interchange turbulence in tokamak geometry: Linear versus nonlinear mode structure
journal, June 2005

Scott, Bruce D.
Physics of Plasmas, Vol. 12, Issue 6
DOI: 10.1063/1.1917866

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Observation of quasi-coherent edge fluctuations in Ohmic plasmas on National Spherical Torus Experiment

Journal Article Banerjee, Santanu ; Diallo, A. ; Zweben, S. J. - Physics of Plasmas

A quasi-coherent edge density mode with frequency f{sub mode} ∼ 40 kHz is observed in Ohmic plasmas in National Spherical Torus Experiment using the gas puff imaging diagnostic. This mode is located predominantly just inside the separatrix, with a maximum fluctuation amplitude significantly higher than that of the broadband turbulence in the same frequency range. The quasi-coherent mode has a poloidal wavelength λ{sub pol} ∼ 16 cm and a poloidal phase velocity of V{sub pol} ∼ 4.9 ± 0.3 km s{sup −1} in the electron diamagnetic direction, which are similar to the characteristics expected from a linear drift-wave-like mode in the edge. This is the first observation of amore »« less
https://doi.org/10.1063/1.4946871
Observation of quasi-coherent edge fluctuations in Ohmic plasmas on NSTX

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A quasi-coherent mode with frequency f = 40 kHz is observed in Ohmic plasmas in NSTX with the gas puff imaging diagnostic (GPI). This mode is located predominantly just inside the separatrix, with a maximum fluctuation amplitude similar to that of the broadband turbulence in the same frequency range. The quasi-coherent mode has a poloidal wavelength 16 cm and a poloidal velocity 49 km/s in the electron diamagnetic direction, which are similar to the characteristics expected from a linear drift-wave like mode in the edge.
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Characterization of the spatial structure of turbulence fluctuations during the edge localized mode cycle in the pedestal region is reported. Using the beam emission spectroscopy and the correlation reflectometry systems, measurements show spatial structure-k{sub Up-Tack }{rho}{sub i}{sup ped}-ranging from 0.2 to 0.7 propagating in the ion diamagnetic drift direction at the pedestal top. These propagating spatial scales are found to be anisotropic and consistent with ion-scale microturbulence of the type ion temperature gradient and/or kinetic ballooning modes.
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Similar Records

Title: Observation of quasi-coherent edge fluctuations in Ohmic plasmas on National Spherical Torus Experiment

Citation Formats

New insights on boundary plasma turbulence and the quasi-coherent mode in Alcator C-Mod using a Mirror Langmuir Probe journal, May 2014

Correlations between quasi-coherent fluctuations and the pedestal evolution during the inter-edge localized modes phase on DIII-Da) journal, May 2015

An overview of recent physics results from NSTX journal, March 2015

Quasi-coherent fluctuations limiting the pedestal growth on Alcator C-Mod: experiment and modelling journal, April 2015

Observation of Edge Instability Limiting the Pedestal Growth in Tokamak Plasmas journal, March 2014

Modeling the effect of lithium-induced pedestal profiles on scrape-off-layer turbulence and the heat flux width journal, September 2015

Observation of a quasicoherent mode in the Texas Experimental Tokamak journal, April 1993

Flow and shear behavior in the edge and scrape-off layer of L-mode plasmas in National Spherical Torus Experiment journal, January 2011

New Fluctuation Phenomena in the H -Mode Regime of Poloidal-Diverter Tokamak Plasmas journal, August 1984

New Edge Coherent Mode Providing Continuous Transport in Long-Pulse H-mode Plasmas journal, May 2014

Edge and SOL turbulence and blob variations over a large database in NSTX journal, September 2015

Intrinsic rotation generation in NSTX ohmic H-mode plasmas journal, May 2013

Discriminating the trapped electron modes contribution in density fluctuation spectra journal, August 2015

Drift wave versus interchange turbulence in tokamak geometry: Linear versus nonlinear mode structure journal, June 2005

New insights on boundary plasma turbulence and the quasi-coherent mode in Alcator C-Mod using a Mirror Langmuir Probe
journal, May 2014

Correlations between quasi-coherent fluctuations and the pedestal evolution during the inter-edge localized modes phase on DIII-Da)
journal, May 2015

An overview of recent physics results from NSTX
journal, March 2015

Quasi-coherent fluctuations limiting the pedestal growth on Alcator C-Mod: experiment and modelling
journal, April 2015

Observation of Edge Instability Limiting the Pedestal Growth in Tokamak Plasmas
journal, March 2014

Modeling the effect of lithium-induced pedestal profiles on scrape-off-layer turbulence and the heat flux width
journal, September 2015

Observation of a quasicoherent mode in the Texas Experimental Tokamak
journal, April 1993

Flow and shear behavior in the edge and scrape-off layer of L-mode plasmas in National Spherical Torus Experiment
journal, January 2011

New Fluctuation Phenomena in the $H$ -Mode Regime of Poloidal-Diverter Tokamak Plasmas
journal, August 1984

New Edge Coherent Mode Providing Continuous Transport in Long-Pulse H-mode Plasmas
journal, May 2014

Edge and SOL turbulence and blob variations over a large database in NSTX
journal, September 2015

Intrinsic rotation generation in NSTX ohmic H-mode plasmas
journal, May 2013

Discriminating the trapped electron modes contribution in density fluctuation spectra
journal, August 2015

Drift wave versus interchange turbulence in tokamak geometry: Linear versus nonlinear mode structure
journal, June 2005