2011
DOI: 10.1016/j.jnucmat.2011.01.117
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Model for screening of resonant magnetic perturbations by plasma in a realistic tokamak geometry and its impact on divertor strike points

Abstract: This work addresses the question of the relation between strike-point splitting and magnetic stochasticity at the edge of a poloidally diverted tokamak in the presence of externally imposed magnetic perturbations. More specifically, ad-hoc helical current sheets are introduced in order to mimic a hypothetical screening of the external resonant magnetic perturbations by the plasma. These current sheets, which suppress magnetic islands, are found to reduce the amount of splitting expected at the target, which su… Show more

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Cited by 43 publications
(53 citation statements)
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“…These lobes near the X-point are observed in the experiments, either directly ( [33], [34]) or as the footprints of high heat and/or particle fluxes where the lobes intersect the divertor [35][36][37][38]. Models of plasma response based on a simplified assumption of screening currents on resonant surfaces [39] or on a linear MHD model [40] predict significant shortening of the lobes when the RMP is screened by the plasma response. Shortening is observed in the magnetic field topology [38][39][40] and through the reduction of fluxes [41,42] and generally increases with the increase of the width of the plasma region where the RMP is screened [39].…”
Section: Stochasticity At the Edgementioning
confidence: 99%
“…These lobes near the X-point are observed in the experiments, either directly ( [33], [34]) or as the footprints of high heat and/or particle fluxes where the lobes intersect the divertor [35][36][37][38]. Models of plasma response based on a simplified assumption of screening currents on resonant surfaces [39] or on a linear MHD model [40] predict significant shortening of the lobes when the RMP is screened by the plasma response. Shortening is observed in the magnetic field topology [38][39][40] and through the reduction of fluxes [41,42] and generally increases with the increase of the width of the plasma region where the RMP is screened [39].…”
Section: Stochasticity At the Edgementioning
confidence: 99%
“…Details of this method are presented in Ref. 16 with examples for COM-PASS and JET including an estimate of the numerical error. In the present case, we use 4096 filaments for a discretization of each current sheet.…”
Section: Magnetic Field Configurationmentioning
confidence: 99%
“…The helical lobes are much shorter in the case with plasma response, which indicates that a less pronounced pattern will be imprinted on the edge plasma as well. The size of the magnetic footprint depends on the number of screening surfaces (as shown for COMPASS and JET using the Melnikov function 16 ) and will further diminish if more screening surfaces are included, e.g., at m ¼ 12; 13; …, or increase if fewer screening surfaces are selected. Two other examples of a "plasma response" are shown in Figure .…”
Section: -2 Frerichs Et Almentioning
confidence: 99%
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“…Due to the limited capability of the PFCs to withstand the enormous heat loads expected in particular in large devices, ELMs have to be controlled or even suppressed in ITER. An important success to provide such a control tool was reported by several devices (COM-PASS [1], DIII-D [2, 3, 4, 5], JET [6,7], . .…”
Section: Introductionmentioning
confidence: 99%