Radial propagation of Type-I ELMs on JET

Fundamenski, W.; Sailer, W.; Contributors, Jet

doi:10.1088/0741-3335/46/1/015

Cited by 63 publications

(88 citation statements)

References 22 publications

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“…Data from both JET 95,293 and DIII-D 273,294 is consistent with the picture that ELM filaments are ejected mostly on the low field side, thereby launching a sound wave or perhaps a sonic front that propagates along the field lines. However, at low densities, this picture is apparently not so clear.…”

Section: B Ballooning and Parallel Transport In The Solsupporting

confidence: 74%

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Convective transport by intermittent blob-filaments: Comparison of theory and experiment

2011

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A blob-filament (or simply “blob”) is a magnetic-field-aligned plasma structure which is considerably denser than the surrounding background plasma and highly localized in the directions perpendicular to the equilibrium magnetic field B. In experiments and simulations, these intermittent filaments are often formed near the boundary between open and closed field lines, and seem to arise in theory from the saturation process for the dominant edge instabilities and turbulence. Blobs become charge-polarized under the action of an external force which causes unequal drifts on ions and electrons; the resulting polarization-induced E × B drift moves the blobs radially outwards across the scrape-off-layer (SOL). Since confined plasmas generally are subject to radial or outwards expansion forces (e.g., curvature and ∇B forces in toroidal plasmas), blob transport is a general phenomenon occurring in nearly all plasmas. This paper reviews the relationship between the experimental and theoretical results on blob formation, dynamics and transport and assesses the degree to which blob theory and simulations can be compared and validated against experiments.

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Section: B Ballooning and Parallel Transport In The Solsupporting

confidence: 74%

“…258,293 However, there have been no attempts to date at quantitative identification of specifically EM regimes predicted by blob theory. There was an indication of a blob velocity scaling independent of normalized blob radius 30 (see Fig.…”

Section: Electromagnetic Effects On Blob-filaments and Elmsmentioning

confidence: 99%

Convective transport by intermittent blob-filaments: Comparison of theory and experiment

2011

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“…4.2.2.2.1. The observed ELM radial propagation velocities are of a size compatible with those expected from a model for the propagation of "blobs" [195,196] in the SOL [194,83] [31]. [187].…”

Section: Interaction Of Type I Elms With the Main Chamber Plasma Facisupporting

confidence: 60%

“…Measurements of power flux to PFCs in the main chamber and of the electron temperature and density in the far SOL during ELMs [188,83,194,197] are consistent with the energy flux onto main chamber PFCs being associated with the convective radial transport of ion energy. Pedestal ions reaching first wall surfaces do not appear to lose much of their energy either to electrons or to the divertor target [194,188].…”

Section: Interaction Of Type I Elms With the Main Chamber Plasma Facimentioning

confidence: 56%

“…The typical radial propagation velocity of the plasma ELM density perturbation in the SOL is of the order of vr ~ 1 km/s in all divertor experiments/ELM types [83,191,180,194]. This leads to an ELM radial propagation timescale of ~ 100 µs, which is similar to the timescale for parallel transport in the SOL during ELMs, as discussed in Sec.…”

Section: Interaction Of Type I Elms With the Main Chamber Plasma Facimentioning

confidence: 57%

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Chapter 4: Power and particle control

Loarte¹,

et al. 2007

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Abstract.Progress, since the ITER Physics Basis publication, in understanding the processes that will determine the properties of the plasma edge and its interaction with material elements in ITER is described. Experimental areas where significant progress has taken place are : energy transport in the SOL in particular of the anomalous transport scaling, particle transport in the SOL that plays a major role in the interaction of diverted plasmas with the main chamber material elements, ELM energy deposition on material elements and the transport mechanism for the ELM energy from the main plasma to the plasma facing components, the physics of plasma detachment and neutral dynamics including the edge density profile structure and the control of plasma particle content and He removal, the erosion of low and high Z materials in fusion devices, their transport to the core plasma and their migration at the plasma edge including the formation of mixed materials, the processes determining the size and location of the retention of tritium in fusion devices and methods to remove it and the processes determining the efficiency of the various fuelling methods as well as their development towards the ITER requirements. This experimental progress has been accompanied by the development of modelling tools for the physical processes at the edge plasma and plasma-materials interaction and the further validation of these models by comparing their predictions with the new experimental results. Progress in the modelling development and validation has been mostly concentrated in the following areas : refinement of the predictions for ITER with plasma edge modelling codes by inclusion of detailed geometrical features of the divertor and the introduction of physical effects, which can play a 2 major role in determining the divertor parameters at the divertor for ITER conditions such as hydrogen radiation transport and neutral-neutral collisions, modelling of the ion orbits at the plasma edge, which can play a role in determining power deposition at the divertor target, models for plasma-materials and plasma dynamics interaction during ELMs and disruptions, models for the transport of impurities at the plasma edge to describe the core contamination by impurities and the migration of eroded materials at the edge plasma and its associated tritium retention and models for the turbulent processes that determine the anomalous transport of energy and particles across the SOL. The implications for the expected performance of the reference regimes in ITER, the operation of the ITER device and the lifetime of the plasma facing materials are discussed. Introduction.This chapter outlines the significant progress achieved since the ITER Physics Basis in understanding basic scrape-off layer (SOL) and divertor processes in a tokamak. The interaction of plasma with first-wall surfaces will have considerable impact on the performance of fusion plasmas, the lifetime of plasma facing components, and the retention of tritium in next step Burning Plasma E...

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