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3D structure and dynamics of filaments in turbulence simulations of WEST diverted plasmas
- Source :
- Nuclear Fusion, Nuclear Fusion, 2019, Nuclear Fusion, IOP Publishing, 2019
- Publication Year :
- 2019
- Publisher :
- HAL CCSD, 2019.
-
Abstract
- International audience; We study the effect of a diverted magnetic geometry on edge plasma turbulence, focusing on the three-dimensional structure and dynamics of filaments, also called blobs, in simulations of the WEST tokamak, featuring a primary and secondary X-point. For this purpose, in addition to classical analysis techniques, we apply here a novel fully 3D Blob Recognition And Tracking (BRAT) algorithm, allowing for the first time to resolve the three-dimensional structure and dynamics of the blobs in a turbulent 3D plasma featuring a realistic magnetic geometry. The results are tested against existing theoretical scalings of blob velocity [Myra et al, Physics of Plasmas 2006]. The complementary analysis of the 3D structure of the filaments shows how they disconnect from the divertor plate in the vicinity of the X-points, leading to a transition from a sheath-connected regime to the ideal-interchange one. Furthermore, the numerical results show non-negligible effects of the turbulent background plasma: approximately half of the detected filaments are involved in mutual interactions, eventually resulting in negative radial velocities, and a fraction of the filaments is generated by turbulence directly below the X-point.
- Subjects :
- Nuclear and High Energy Physics
Tokamak
[SPI] Engineering Sciences [physics]
Structure (category theory)
Edge (geometry)
Tracking (particle physics)
01 natural sciences
[PHYS] Physics [physics]
010305 fluids & plasmas
law.invention
[SPI]Engineering Sciences [physics]
law
Physics::Plasma Physics
0103 physical sciences
010306 general physics
Physics
[PHYS]Physics [physics]
Turbulence
Divertor
[SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment
Dynamics (mechanics)
[SPI.PLASMA]Engineering Sciences [physics]/Plasmas
[SPI.PLASMA] Engineering Sciences [physics]/Plasmas
[SPI.FLUID] Engineering Sciences [physics]/Reactive fluid environment
Mechanics
Plasma
Condensed Matter Physics
[INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation
[INFO.INFO-MO] Computer Science [cs]/Modeling and Simulation
Subjects
Details
- Language :
- English
- ISSN :
- 00295515, 17414326, and 07413335
- Database :
- OpenAIRE
- Journal :
- Nuclear Fusion, Nuclear Fusion, 2019, Nuclear Fusion, IOP Publishing, 2019
- Accession number :
- edsair.doi.dedup.....b1d722773173894e75fcef98a1a49b00