Edge localized modes control by resonant magnetic perturbations

Nardon, E.; Bécoulet, M.; Huysmans, G.; Czarny, Olivier; Thomas, Paul R.; Lipa, M.; Moyer, R. A.; Evans, T.E.; Federici, G.; Gribov, Y.; Polevoi, A.; Saibene, G.; Portone, A.; Loarte, A.

doi:10.1016/j.jnucmat.2007.01.189

Cited by 57 publications

(95 citation statements)

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“…The field for these different RMP configurations is calculated using the ERGOS vacuum field line tracing code [26]. The effective radial resonant field component of the applied perturbation normalised to the toroidal field (b r res ) is the amplitude of the resonant Fourier component in the spectrum of b 1 divided by the average value of ∇ ψ pol on the magnetic surface, normalised to the major radius [26]:…”

Section: Effect Of Different Rmp Configurations On Elms and Heat Loadsmentioning

confidence: 99%

Assessing the merits of resonant magnetic perturbations with different toroidal mode numbers for controlling edge localised modes

et al. 2014

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Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publicationCitation for published version (APA): Chapman, I. T., Kirk, A., Akers, R. J., Ham, C. J., Harrison, J. R., Hawke, J. N., ... Thorton, A. J. (2014). Assessing the merits of resonant magnetic perturbations with different toroidal mode numbers for controlling edge localised modes. Nuclear Fusion, 54(12), 123003-1/15. [123003]. DOI: 10.1088/0029-5515/54/12/123003 General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. AbstractAn increase in ELM frequency has been demonstrated in MAST by applying resonant magnetic perturbations (RMPs) with toroidal mode number, n RMP = 2, 3, 4, 6. It has been observed that the mitigated ELM frequency increases with the amplitude of the applied field provided it is above a critical threshold. This threshold value depends on the mode number of the RMP, with higher n RMP having a larger critical value. For the same ELM frequency, the reduction in the peak heat load on the divertor plates is approximately the same for all RMP configurations. The RMPs give rise to perturbations to the plasma shape, with lobe structures occurring due to the tangled magnetic fields near the X-point, and corrugations of the plasma boundary at the midplane. The X-point lobe length increases linearly with the applied field when above a threshold, with RMPs of higher toroidal mode number giving rise to longer lobes for the same applied resonant field. Similarly, the midplane displacements increase with the applied field strength, though the corrugation amplitude is less dependent upon the RMP configuration. For all n RMP , the RMPs ...

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Section: Effect Of Different Rmp Configurations On Elms and Heat Loadsmentioning

confidence: 99%

Assessing the merits of resonant magnetic perturbations with different toroidal mode numbers for controlling edge localised modes

et al. 2014

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“…According to this model, the RMP creates overlapping magnetic islands which degrade confinement, reducing the pedestal gradients and thereby stabilizing the ELM [14,22,23]. Almost all the experimental tests of this model, however, estimate the size of magnetic islands by superposing vacuum magnetic perturbations on the equilibrium.…”

Section: The Magnetic-chaos Modelmentioning

confidence: 99%

Role of singular layers in the plasma response to resonant magnetic perturbations

et al. 2012

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Abstract. The response of an H-mode plasma to magnetic perturbations that are resonant in the edge is evaluated using a fluid model. With two exceptions, the plasma rotation suppresses the formation of magnetic islands, holding their widths to less than a tenth of those predicted by the vacuum approximation. The two exceptions are at the foot of the pedestal, where the plasma becomes more resistive, and at the surface where the perpendicular component of the electron velocity reverses. The perturbations exert a force on the plasma that is such as to brake the perpendicular component of the electron rotation. In the pedestal, the corresponding Maxwell stress drives the radial electric field in such a way as to accelerate ion rotation. Despite the suppression of the islands, the perturbations give rise to particle fluxes caused by magnetic flutter, with a negligible contribution from E×B convection. In the pedestal, the fluxes are such as to reduce the density.

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“…When occurring, MHD instabilities are likely to degrade confinement properties and to trigger particle bursts that may significantly damage components of tokamak walls. The control of the instabilities is one of the ITER-building challenges (Evans et al [2], Nardon et al [3]). …”

Section: Introductionmentioning

confidence: 99%