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Improved dynamic response of magnetic feedback in RFX-mod and DIII-D (Articolo in rivista)

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Improved dynamic response of magnetic feedback in RFX-mod and DIII-D (Articolo in rivista) (literal)

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L. Piron; J. M. Hanson; Y. In; G. Marchiori; L. Marrelli; P. Martin; M. Okabayashi; P. Piovesan; H. Reimerdes; A. Soppelsa; E. J. Strait (2011)
Improved dynamic response of magnetic feedback in RFX-mod and DIII-D
in Plasma physics and controlled fusion (Print); IOP Publishing Ltd., Bristol BS1 6BE (Regno Unito)
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L. Piron; J. M. Hanson; Y. In; G. Marchiori; L. Marrelli; P. Martin; M. Okabayashi; P. Piovesan; H. Reimerdes; A. Soppelsa; E. J. Strait (literal)

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Article Number: 084004 - La rivista è pubblicata anche online con ISSN 1361-6587. (literal)

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1 Consorzio RFX, EURATOM-ENEA Association, Corso Stati Uniti 4, 35127 Padova, Italy; - 2 Department of Applied Physics and Applied Mathematics, Columbia University, 500 W 120th Street, New York, NY 10027-6902, USA; - 3 Oak Ridge Institute for Science and Education, PO Box 117, Oak Ridge, TN 37831, USA; - 4 FAR-TECH, Inc., 3550 General Atomics Court, Bldg. 15, Suite 155, San Diego, CA, USA; - 5 Princeton Plasma Physics Laboratory, PO Box 451, Princeton, NJ 08543, USA; - 6 General Atomics, PO Box 85608, San Diego, CA 92186-5608, USA. - (L Piron 1 , J M Hanson 2,3 ,Y In 4 , G Marchiori 1 , L Marrelli 1 , P Martin 1 , M Okabayashi 5 , P Piovesan 1 , H Reimerdes 2,7 , A Soppelsa 1 and E J Strait 6) (literal)

Titolo

Abstract

The wall of any magnetic fusion device is characterized by the presence of several 3D structures, such as portholes for diagnostics and for heating and current drive systems, coil feeds and other features. Time-varying magnetic fields induce eddy currents in the wall, whose pattern is modified by these structures, giving rise to magnetic field errors that can be amplified or shielded by the plasma. Two examples will be given on how the dynamic response of a 3D wall to external magnetic fields can be identified and used to optimize magnetic feedback. In the RFX-mod reversed-field pinch, a dynamic decoupler algorithm has been developed, which allows for the production of pure radial magnetic field harmonics inside the wall, reducing the harmonic distortion due to the 3D wall structures. This is applied here to the problem of producing helical boundary conditions to control helical RFP equilibria. In the DIII-D tokamak, a frequency-dependent scheme for the compensation of the magnetic sensors from spurious n = 1 fields due to the coupling with the feedback and axisymmetric coils has been recently implemented in real time and tested with plasma. The possible relevance of these 3D effects for high performance scenarios is discussed. (literal)

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