Phys. Rev. Lett. 98, 265004 (2007) [5 pages]Active Control of Type-I Edge-Localized Modes with n=1 Perturbation Fields in the JET TokamakReceived 25 January 2007; published 29 June 2007 Type-I edge-localized modes (ELMs) have been mitigated at the JET tokamak using a static external n=1 perturbation field generated by four error field correction coils located far from the plasma. During the application of the n=1 field the ELM frequency increased by a factor of 4 and the amplitude of the Dα signal decreased. The energy loss per ELM normalized to the total stored energy, ΔW/W, dropped to values below 2%. Transport analyses shows no or only a moderate (up to 20%) degradation of energy confinement time during the ELM mitigation phase. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.265004
DOI:
10.1103/PhysRevLett.98.265004
PACS:
52.55.Rk, 28.52.−s, 52.35.Py, 52.55.Fa
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