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Non-local heat flux application for scrape-off layer plasma
- Source :
- Contributions to Plasma Physics, Contributions to Plasma Physics, Wiley-VCH Verlag, 2018, 58 (6-8), pp.563-569. ⟨10.1002/ctpp.201700162⟩, Contributions to Plasma Physics, 2018, 58 (6-8), pp.563-569. ⟨10.1002/ctpp.201700162⟩, Contributions to plasma physics (1985) 58 (2018): 563–569. doi:10.1002/ctpp.201700162, info:cnr-pdr/source/autori:Bufferand H.; Ciraolo G.; Di Cintio P.; Fedorczak N.; Ghendrih P.; Lepri S.; Livi R.; Marandet Y.; Serre E.; Tamain P./titolo:Non-local heat flux application for scrape-off layer plasma/doi:10.1002%2Fctpp.201700162/rivista:Contributions to plasma physics (1985)/anno:2018/pagina_da:563/pagina_a:569/intervallo_pagine:563–569/volume:58
- Publication Year :
- 2018
-
Abstract
- International audience; The non-local expression proposed by Luciani-Mora-Virmont is implemented in a one dimensional fluid model for the scrape-off layer. Analytical solutions for heat equation are discussed as well as the impact of sheath boundary conditions on the continuity of the temperature profile. The non-local heat flux is compared to the Spitzer-Härm heat flux for different collisionality. KEYWORDS heat conduction, non-local transport, plasma physics 1 INTRODUCTION At the entrance of the scrape-off layer, the plasma collisionality í µí¼ ⋆ defined as the ratio between the field line length and collision mean free path is found to be of order unity. Despite this low collisionality, the tokamak edge plasma modelling relies mostly on the fluid approach and collisional closures that are theoretically only valid at high collisionality. Departure between Braginskii fluid description and kinetic modelling has been highlighted, particularly an underestimation of temperature gradient by the fluid approach. [1] Several kinetic corrections have been proposed to improve the plasma description at intermediate collisionality. [2-5] In this contribution, we investigate kinetic corrections to the local Spitzer-Härm (Braginskii) closure for the heat flux; more precisely, we focus on applying the non-local expression for the heat flux proposed by Luciani-Mora-Virmont [6] to scrape-off layer physics. In particular, we adapt boundary conditions and implement the non-local expression into a 1D hydrodynamic model for the scrape-off layer.
- Subjects :
- Physics
Tokamak
Mean free path
plasma physics
heat conduction
Plasma
Mechanics
Collisionality
Condensed Matter Physics
Thermal conduction
01 natural sciences
010305 fluids & plasmas
law.invention
non-local transport
Heat flux
law
Physics::Plasma Physics
0103 physical sciences
Physics::Space Physics
Heat equation
[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering
Boundary value problem
010306 general physics
Subjects
Details
- ISSN :
- 08631042 and 15213986
- Database :
- OpenAIRE
- Journal :
- Contributions to Plasma Physics
- Accession number :
- edsair.doi.dedup.....488afb189750a869cb61d141bbe3e724
- Full Text :
- https://doi.org/10.1002/ctpp.201700162