88 research outputs found

    Model for screening of resonant magnetic perturbations by plasma in a realistic tokamak geometry and its impact on divertor strike points

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    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 suggests that screening effects should be observable experimentally. Multiple screening current sheets reinforce each other, i.e. less current relative to the case of only one current sheet is required to screen the perturbation.Comment: Accepted in the Proceedings of the 19th International Conference on Plasma Surface Interactions, to be published in Journal of Nuclear Materials. Version 2: minor formatting and text improvements, more results mentioned in the conclusion and abstrac

    Moderation of divertor heat loads by fuelling and impurity seeding in well-confined ELMy H-mode plasmas on JET

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    Cross sections of deposited layers investigated by micronuclear reaction analysis

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    ELM size analysis in JET hybrid plasmas

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    Type-I ELM power deposition profile width and temporal shape in JET

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    Type-I ELM filamentary substructure on the JET divertor target

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    Modeling of runaway electron beams for JET and ITER

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    Massive gas injections in JET - Impact on wall conditions

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    Demonstration of real-time control of impurity seeding plus outboard strike-point sweeping in JET ELMy H-mode plasmas

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    Survey of disruption causes at JET

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