Stability and Transport of Gyrokinetic Critical Pedestals
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| Format: | Preprint |
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2024
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| author | Parisi, J. F. Nelson, A. O. Guttenfelder, W. Gaur, R. Berkery, J. W. Kaye, S. M. Barada, K. Clauser, C. Diallo, A. Hatch, D. R. Kleiner, A. Lampert, M. Macwan, T. Menard, J. E. |
| author_facet | Parisi, J. F. Nelson, A. O. Guttenfelder, W. Gaur, R. Berkery, J. W. Kaye, S. M. Barada, K. Clauser, C. Diallo, A. Hatch, D. R. Kleiner, A. Lampert, M. Macwan, T. Menard, J. E. |
| contents | A gyrokinetic threshold model for pedestal width-height scaling prediction is applied to multiple devices and to a shaping and aspect-ratio scan giving $Δ_{\mathrm{ped}} = 0.92 A^{1.04} κ^{-1.24} 0.38^δ β_{θ,\mathrm{ped}}^{1.05}$ for pedestal width $Δ_{\mathrm{ped}}$, aspect-ratio $A$, elongation $κ$, triangularity $δ$, and normalized pedestal height $β_{θ,\mathrm{ped}}$. We also find a width-transport scaling $Δ_{\mathrm{ped} } = 0.028 \left(q_e/Γ_e - 1.7 \right)^{1.5} \sim η_e ^{1.5}$ where $q_e$ and $Γ_e$ are turbulent electron heat and particle fluxes and $η_e = \nabla \ln T_e / \nabla \ln n_e$ for electron temperature $T_e$ and density $n_e$. Pedestals close to those limited by kinetic-ballooning-modes (KBMs) have modified turbulent transport properties compared to strongly driven KBMs. The role of flow shear is studied as a width-height scaling constraint and pedestal saturation mechanism for a standard and wide pedestal discharge. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2401_14260 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Stability and Transport of Gyrokinetic Critical Pedestals Parisi, J. F. Nelson, A. O. Guttenfelder, W. Gaur, R. Berkery, J. W. Kaye, S. M. Barada, K. Clauser, C. Diallo, A. Hatch, D. R. Kleiner, A. Lampert, M. Macwan, T. Menard, J. E. Plasma Physics A gyrokinetic threshold model for pedestal width-height scaling prediction is applied to multiple devices and to a shaping and aspect-ratio scan giving $Δ_{\mathrm{ped}} = 0.92 A^{1.04} κ^{-1.24} 0.38^δ β_{θ,\mathrm{ped}}^{1.05}$ for pedestal width $Δ_{\mathrm{ped}}$, aspect-ratio $A$, elongation $κ$, triangularity $δ$, and normalized pedestal height $β_{θ,\mathrm{ped}}$. We also find a width-transport scaling $Δ_{\mathrm{ped} } = 0.028 \left(q_e/Γ_e - 1.7 \right)^{1.5} \sim η_e ^{1.5}$ where $q_e$ and $Γ_e$ are turbulent electron heat and particle fluxes and $η_e = \nabla \ln T_e / \nabla \ln n_e$ for electron temperature $T_e$ and density $n_e$. Pedestals close to those limited by kinetic-ballooning-modes (KBMs) have modified turbulent transport properties compared to strongly driven KBMs. The role of flow shear is studied as a width-height scaling constraint and pedestal saturation mechanism for a standard and wide pedestal discharge. |
| title | Stability and Transport of Gyrokinetic Critical Pedestals |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2401.14260 |