Theory-based scaling laws of near and far scrape-off layer widths in single-null L-mode discharges
arXiv:2101.11848 · doi:10.1088/1741-4326/abf8f6
Abstract
Theory-based scaling laws of the near and far scrape-off layer (SOL) widths are analytically derived for L-mode diverted tokamak discharges by using a two-fluid model. The near SOL pressure and density decay lengths are obtained by leveraging a balance among the power source, perpendicular turbulent transport across the separatrix, and parallel losses at the vessel wall, while the far SOL pressure and density decay lengths are derived by using a model of intermittent transport mediated by filaments. The analytical estimates of the pressure decay length in the near SOL is then compared to the results of three-dimensional, flux-driven, global, two-fluid turbulence simulations of L-mode diverted tokamak plasmas, and validated against experimental measurements taken from an experimental multi-machine database of divertor heat flux profiles, showing in both cases a very good agreement. Analogously, the theoretical scaling law for the pressure decay length in the far SOL is compared to simulation results and to experimental measurements in TCV L-mode discharges, pointing out the need of a large multi-machine database for the far SOL decay lengths.
arXiv commentNucl. Fusion 2021
References in corpus (16)
- Gyrokinetic projection of the divertor heat-flux width from present tokamaks to ITER
- Intermittent turbulence and turbulent structures in a linear magnetized plasma
- Experimental validation of a filament transport model in turbulent magnetized plasmas
- Recent progress towards a quantitative description of filamentary SOL transport
- Global turbulence simulations of the tokamak edge region with GRILLIX
- BOUT++: Recent and current developments
- Electromagnetic full- gyrokinetics in the tokamak edge with discontinuous Galerkin methods
- On the role of filaments in perpendicular heat transport at the Scrape-off Layer
- Scrape Off Layer profiles interpreted with filament dynamics
- Investigation of turbulent transport regimes in the tokamak edge by using two-fluid simulations
- On the relation between non-exponential Scrape Off Layer profiles and the dynamics of filaments
- Pedestal and edge turbulence characteristics from an XGC1 gyrokinetic simulation
- Intermittent electron density and temperature fluctuations and associated fluxes in the Alcator C-Mod scrape-off layer
- Impurity seeding for suppression of the near Scrape-Off Layer heat flux feature in tokamak limited plasmas
- Characterization of edge and scrape-off layer fluctuations using the fast Li-BES system on COMPASS
- Blob dynamics in TORPEX poloidal null configurations
Cited by in corpus (9)
- The GBS code for the self-consistent simulation of plasma turbulence and kinetic neutral dynamics in the tokamak boundary
- First-principles density limit scaling in tokamaks based on edge turbulent transport and implications for ITER
- X-point and divertor filament dynamics from Gas Puff Imaging on TCV
- Effect of triangularity on plasma turbulence and the SOL-width scaling in L-mode diverted tokamak configurations
- Turbulent transport regimes in the tokamak boundary and operational limits
- Global fluid simulation of plasma turbulence in a stellarator with an island divertor
- Magnetic flutter effect on validated edge turbulence simulations
- Simulations of scrape-off layer power width for EAST H-mode plasma and ITER 15 MA baseline scenario by 2D electrostatic turbulence code
- Three-dimensional boundary turbulence simulations of a RFX-mod plasma in the presence of voltage biasing