Turbulent heat transport in TOKAM3X edge plasma simulations

Baudoin, Camille; Tamain, P.; Bufferand, Hugo; Ciraolo, Guido; Fedorczak, N.; Galassi, D.; Ghendrih, Philippe; Nace, Nicolas

doi:10.1002/ctpp.201700168

Cited by 10 publications

(20 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The code is run here in its isothermal version and in a circular limited geometry. A non-isothermal version of the code exists as seen in [23] and is able to run into complex and realistic geometries [21]. This allows us in this first work to exclude geometrical and non isothermal effects for a step-by-step approach.…”

Section: The Tokam3x Modelmentioning

confidence: 99%

Impact of three-dimensional magnetic perturbations on turbulence in tokamak edge plasmas

Luce¹,

Tamain²,

Ciraolo³

et al. 2021

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

The impact of resonant magnetic perturbations (RMP) on the plasma edge equilibrium and on the turbulence is investigated in a circular limited configuration. The study is based on a Braginski-based isothermal fluid model. The flow response of an unperturbated case to a small amplitude three-dimensional single mode RMP is studied and a scan in amplitude and poloidal and toroidal mode number is performed. Special attention is given when magnetic islands appear in the simulation domain on flux surfaces of rational safety factor. Results show an impact of Magnetic Perturbations (MPs) on both the plasma equilibrium and on the turbulence properties, with a deviation to the reference solution which depends on the MPs amplitude and on their wavenumbers. The impact of MPs on turbulence is however globally weaker than on the plasma equilibrium, suggesting a stabilizing effect of the MP on turbulent transport. Experimental trends are recovered such as the density pump-out and the increase of the radial electric field as well as the reorganization of the parallel velocity. The ballooning of the transport is modified under the effect of the perturbations, with a shift of the peaked poloidal region from the upper to the lower outer midplane. In the present model, the SOL width is observed decreasing in the presence of MPs. Turbulence properties are also impacted with the density fluctuations level decreasing in perturbated solutions and the intermittency is globally weakened.

show abstract

Section: The Tokam3x Modelmentioning

confidence: 99%

Impact of three-dimensional magnetic perturbations on turbulence in tokamak edge plasmas

Luce¹,

Tamain²,

Ciraolo³

et al. 2021

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

show abstract

“…[19]. Neumann conditions are applied at the radial inner and outer boundaries, and Bohm-Chodura boundary conditions are applied at the target plates [23].…”

Section: The Tokam3x Code For Fluid Turbulence Simulationsmentioning

confidence: 99%

“…In addition, the plasma collisionality is set to ν * ≡ ρ s /(c s τ e ) = 0.072, where τ e is the electron collision time. The choice of this value, approximately a factor of 5 larger than the typical experimental one, is driven by the need to keep computational costs reasonable [23], since small collisionality leads to smaller turbulent structures and requires grid with higher resolution. The impact of this parameter on blob dynamics will be further discussed in section 5.…”

Section: The Tokam3x Code For Fluid Turbulence Simulationsmentioning

confidence: 99%

3D structure and dynamics of filaments in turbulence simulations of WEST diverted plasmas

et al. 2019

View full text Add to dashboard Cite

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.

show abstract

“…We also remark that the terms of higher order in 1/Ω cD + 2 𝑑/𝑑𝑡 in the perpendicular velocity of D + 2 ions are neglected when writing ∇ • v D + 2 in the temperature equations, Eqs. ( 26) and (27), which is a necessary assumption in order to avoid explicit time derivatives arising from the polarization drift velocity, v pol,D + 2 . Nevertheless, all terms are considered in the divergence of the perpendicular velocity of D + ions in Eq.…”

Section: The Three-fluid Drift-reduced Braginskii Equationsmentioning

confidence: 99%

“…We note that dimensionless units are used in Eqs. (19)(20)(21)(22)(23)(24)(25)(26)(27) and in the rest of the paper. The densities, 𝑛 e , 𝑛 D + and 𝑛 D + 2 , are normalized to the reference value 𝑛 0 , while temperatures, 𝑇 e , 𝑇 D + and 𝑇 D + 2 , are normalized to the respective reference values, 𝑇 e0 , 𝑇 D + 0 and 𝑇 D + 2 0 = 𝑇 D + 0 , which are related by the dimensionless quantity 𝜏 = 𝑇 D + 0 /𝑇 𝑒0 .…”

Section: The Three-fluid Drift-reduced Braginskii Equationsmentioning

confidence: 99%

A self-consistent multi-component model of plasma turbulence and kinetic neutral dynamics for the simulation of the tokamak boundary

Coroado,

Ricci

2021

Preprint

View full text Add to dashboard Cite

A self-consistent model is presented for the simulation of a multi-component plasma in the tokamak boundary. A deuterium plasma is considered, with the plasma species that include electrons, deuterium atomic ions and deuterium molecular ions, while the deuterium atoms and molecules constitute the neutral species. The plasma and neutral models are coupled via a number of collisional interactions, which include dissociation, ionization, charge-exchange and recombination processes. The derivation of the three-fluid drift-reduced Braginskii equations used to describe the turbulent plasma dynamics is presented, including its boundary conditions. The kinetic advection equations for the neutral species are also derived, and their numerical implementation discussed. The first results of multi-component plasma simulations carried out by using the GBS code are then presented and analyzed, being compared with results obtained with the single-component plasma model.

show abstract

Turbulent heat transport in TOKAM3X edge plasma simulations

Cited by 10 publications

References 20 publications

Impact of three-dimensional magnetic perturbations on turbulence in tokamak edge plasmas

Impact of three-dimensional magnetic perturbations on turbulence in tokamak edge plasmas

3D structure and dynamics of filaments in turbulence simulations of WEST diverted plasmas

A self-consistent multi-component model of plasma turbulence and kinetic neutral dynamics for the simulation of the tokamak boundary

Contact Info

Product

Resources

About