Characterization and parametric dependencies of low wavenumber pedestal turbulence in the National Spherical Torus Experiment
The spherical torus edge region is among the most challenging regimes for plasma turbulence simulations. Here, we measure the spatial and temporal properties of ion-scale turbulence in the steep gradient region of H-mode pedestals during edge localized mode-free, MHD quiescent periods in the Nationa...
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| Veröffentlicht in: | Physics of plasmas 2013-05, Vol.20 (5) |
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| container_title | Physics of plasmas |
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| creator | Smith, D. R. Fonck, R. J. McKee, G. R. Thompson, D. S. Bell, R. E. Diallo, A. Guttenfelder, W. Kaye, S. M. LeBlanc, B. P. Podesta, M. |
| description | The spherical torus edge region is among the most challenging regimes for plasma turbulence simulations. Here, we measure the spatial and temporal properties of ion-scale turbulence in the steep gradient region of H-mode pedestals during edge localized mode-free, MHD quiescent periods in the National Spherical Torus Experiment. Poloidal correlation lengths are about 10 ρi, and decorrelation times are about 5 a/cs. Next, we introduce a model aggregation technique to identify parametric dependencies among turbulence quantities and transport-relevant plasma parameters. The parametric dependencies show the most agreement with transport driven by trapped-electron mode, kinetic ballooning mode, and microtearing mode turbulence, and the least agreement with ion temperature gradient turbulence. In addition, the parametric dependencies are consistent with turbulence regulation by flow shear and the empirical relationship between wider pedestals and larger turbulent structures. |
| doi_str_mv | 10.1063/1.4803913 |
| format | Article |
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R. ; Fonck, R. J. ; McKee, G. R. ; Thompson, D. S. ; Bell, R. E. ; Diallo, A. ; Guttenfelder, W. ; Kaye, S. M. ; LeBlanc, B. P. ; Podesta, M.</creator><creatorcontrib>Smith, D. R. ; Fonck, R. J. ; McKee, G. R. ; Thompson, D. S. ; Bell, R. E. ; Diallo, A. ; Guttenfelder, W. ; Kaye, S. M. ; LeBlanc, B. P. ; Podesta, M.</creatorcontrib><description>The spherical torus edge region is among the most challenging regimes for plasma turbulence simulations. Here, we measure the spatial and temporal properties of ion-scale turbulence in the steep gradient region of H-mode pedestals during edge localized mode-free, MHD quiescent periods in the National Spherical Torus Experiment. Poloidal correlation lengths are about 10 ρi, and decorrelation times are about 5 a/cs. Next, we introduce a model aggregation technique to identify parametric dependencies among turbulence quantities and transport-relevant plasma parameters. The parametric dependencies show the most agreement with transport driven by trapped-electron mode, kinetic ballooning mode, and microtearing mode turbulence, and the least agreement with ion temperature gradient turbulence. 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R.</creatorcontrib><creatorcontrib>Fonck, R. J.</creatorcontrib><creatorcontrib>McKee, G. R.</creatorcontrib><creatorcontrib>Thompson, D. S.</creatorcontrib><creatorcontrib>Bell, R. E.</creatorcontrib><creatorcontrib>Diallo, A.</creatorcontrib><creatorcontrib>Guttenfelder, W.</creatorcontrib><creatorcontrib>Kaye, S. M.</creatorcontrib><creatorcontrib>LeBlanc, B. P.</creatorcontrib><creatorcontrib>Podesta, M.</creatorcontrib><title>Characterization and parametric dependencies of low wavenumber pedestal turbulence in the National Spherical Torus Experiment</title><title>Physics of plasmas</title><description>The spherical torus edge region is among the most challenging regimes for plasma turbulence simulations. Here, we measure the spatial and temporal properties of ion-scale turbulence in the steep gradient region of H-mode pedestals during edge localized mode-free, MHD quiescent periods in the National Spherical Torus Experiment. Poloidal correlation lengths are about 10 ρi, and decorrelation times are about 5 a/cs. Next, we introduce a model aggregation technique to identify parametric dependencies among turbulence quantities and transport-relevant plasma parameters. The parametric dependencies show the most agreement with transport driven by trapped-electron mode, kinetic ballooning mode, and microtearing mode turbulence, and the least agreement with ion temperature gradient turbulence. In addition, the parametric dependencies are consistent with turbulence regulation by flow shear and the empirical relationship between wider pedestals and larger turbulent structures.</description><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</subject><subject>AGGLOMERATION</subject><subject>BALLOONING INSTABILITY</subject><subject>EDGE LOCALIZED MODES</subject><subject>ELECTRON TEMPERATURE</subject><subject>H-MODE PLASMA CONFINEMENT</subject><subject>ION TEMPERATURE</subject><subject>MAGNETOHYDRODYNAMICS</subject><subject>NSTX DEVICE</subject><subject>PLASMA DIAGNOSTICS</subject><subject>PLASMA SIMULATION</subject><subject>SHEAR</subject><subject>TEARING INSTABILITY</subject><subject>TEMPERATURE GRADIENTS</subject><subject>TRAPPED ELECTRONS</subject><subject>TURBULENCE</subject><issn>1070-664X</issn><issn>1089-7674</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNotkU1LxDAQhoso-HnwHwS86KFrsknT7FGW9QNEDyp4C8l0yla6SU1SVwX_u9Hducw7Mw8vvExRnDI6YVTySzYRivIZ4zvFAaNqVtayFrt_uqallOJ1vziM8Y1SKmSlDoqf-dIEAwlD921S5x0xriFD3q0whQ5IgwO6Bh10GIlvSe_XZG0-0I0ri4EM2GBMpidpDHbsM4ekcyQtkTz8--XT07DM9pDVsw9jJIvPIc8rdOm42GtNH_Fk24-Kl-vF8_y2vH-8uZtf3ZfAK5lKCVVtmkopK62SnDYMbCWgNVNFKVjW8tbKpgYuKjnlpm5B1MYIa6sZICLjR8XZxtfH1OkIXUJYgncOIelpLkWlytT5hhqCfx9zLL3qImDfG4d-jJoJNuNSTBXP6MUGheBjDNjqIScy4Uszqv8eoZnePoL_AnBFfXA</recordid><startdate>20130501</startdate><enddate>20130501</enddate><creator>Smith, D. 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J.</creatorcontrib><creatorcontrib>McKee, G. R.</creatorcontrib><creatorcontrib>Thompson, D. S.</creatorcontrib><creatorcontrib>Bell, R. E.</creatorcontrib><creatorcontrib>Diallo, A.</creatorcontrib><creatorcontrib>Guttenfelder, W.</creatorcontrib><creatorcontrib>Kaye, S. M.</creatorcontrib><creatorcontrib>LeBlanc, B. P.</creatorcontrib><creatorcontrib>Podesta, M.</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>OSTI.GOV</collection><jtitle>Physics of plasmas</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Smith, D. R.</au><au>Fonck, R. J.</au><au>McKee, G. R.</au><au>Thompson, D. S.</au><au>Bell, R. E.</au><au>Diallo, A.</au><au>Guttenfelder, W.</au><au>Kaye, S. M.</au><au>LeBlanc, B. P.</au><au>Podesta, M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Characterization and parametric dependencies of low wavenumber pedestal turbulence in the National Spherical Torus Experiment</atitle><jtitle>Physics of plasmas</jtitle><date>2013-05-01</date><risdate>2013</risdate><volume>20</volume><issue>5</issue><issn>1070-664X</issn><eissn>1089-7674</eissn><abstract>The spherical torus edge region is among the most challenging regimes for plasma turbulence simulations. Here, we measure the spatial and temporal properties of ion-scale turbulence in the steep gradient region of H-mode pedestals during edge localized mode-free, MHD quiescent periods in the National Spherical Torus Experiment. Poloidal correlation lengths are about 10 ρi, and decorrelation times are about 5 a/cs. Next, we introduce a model aggregation technique to identify parametric dependencies among turbulence quantities and transport-relevant plasma parameters. The parametric dependencies show the most agreement with transport driven by trapped-electron mode, kinetic ballooning mode, and microtearing mode turbulence, and the least agreement with ion temperature gradient turbulence. In addition, the parametric dependencies are consistent with turbulence regulation by flow shear and the empirical relationship between wider pedestals and larger turbulent structures.</abstract><cop>United States</cop><doi>10.1063/1.4803913</doi></addata></record> |
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| ispartof | Physics of plasmas, 2013-05, Vol.20 (5) |
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| source | American Institute of Physics (AIP) Journals; AIP Digital Archive; Alma/SFX Local Collection |
| subjects | 70 PLASMA PHYSICS AND FUSION TECHNOLOGY AGGLOMERATION BALLOONING INSTABILITY EDGE LOCALIZED MODES ELECTRON TEMPERATURE H-MODE PLASMA CONFINEMENT ION TEMPERATURE MAGNETOHYDRODYNAMICS NSTX DEVICE PLASMA DIAGNOSTICS PLASMA SIMULATION SHEAR TEARING INSTABILITY TEMPERATURE GRADIENTS TRAPPED ELECTRONS TURBULENCE |
| title | Characterization and parametric dependencies of low wavenumber pedestal turbulence in the National Spherical Torus Experiment |
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