Multi-code analysis of scrape-off layer filament dynamics in MAST

Self Cite

Article:Militello, Fulvio, Dudson, Benjamin Daniel orcid.org/0000-0002-0094-4867, Easy, Luke et al. (2 more authors) (2017) On the interaction of Scrape Off Layer filaments. Plasma Physics and Controlled Fusion. AbstractThe interaction of L-mode and inter-ELM Scrape-Off Layer (SOL) filaments is investigated by simulating the dynamics of two seeded density perturbations with different initial separation. A numerical campaign of 2D and 3D simulations is presented to explore the effect that different filaments' perpendicular size and relative distance have on their reciprocal action. It is shown that the interaction is weak unless the filaments are in close proximity, i.e. with a separation of the order of the filaments' diameter in the drift plane. The interaction occurs when the dipolar electrostatic fields associated with the filaments merge or cancel each other and it leads to changes in the radial velocity in the centre of mass of the system that are modest (≤ 50%) and quickly decaying with separation. These results show that filaments travelling in the SOL can be considered to a good approximation as independent entities.

Section: Introductionmentioning

confidence: 90%

On the interaction of scrape off layer filaments

Militello

Dudson

Easy

et al. 2017

Self Cite

“…The effects of such 3D models on filamentary transport are discussed in [26] and [27] and the inclusion of 3D effects on the SOL width is discussed in [28]. Figure 10: The nonlinear fit of λ q with respect to the parameters n LCF S , q, T e,LCF S and R 0 for simulations where n, P , q, B 0 .…”

Section: Scaling With Rmentioning

confidence: 99%

Scrape-off layer power fall-off length from turbulence simulations of ASDEX Upgrade L-mode

Olsen

Nielsen

Rasmussen

et al. 2018

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“…The numerical scheme implemented in GBS was subject to a rigorous verification, and the simulation results were validated against several experimental measurements [36,37,39,62].…”

Section: A Implementation and Numericsmentioning

confidence: 99%

Plasma shaping effects on tokamak scrape-off layer turbulence

Riva

Lanti

Jolliet

et al. 2017

The impact of plasma shaping on tokamak scrape-off layer (SOL) turbulence is investigated. The drift-reduced Braginskii equations are written for arbitrary magnetic geometries, and an analytical equilibrium model is used to introduce the dependence of turbulence equations on tokamak inverse aspect ratio ( ), Shafranov's shift (∆), elongation (κ), and triangularity (δ). A linear study of plasma shaping effects on the growth rate of resistive ballooning modes (RBMs) and resistive drift waves (RDWs) reveals that RBMs are strongly stabilized by elongation and negative triangularity,