http://www.cnr.it/ontology/cnr/individuo/prodotto/ID26068

Dynamic decoupling and multi-mode magnetic feedback for error field correction in RFX-mod (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Dynamic decoupling and multi-mode magnetic feedback for error field correction in RFX-mod (Articolo in rivista) (literal)

Anno

2011-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1088/0029-5515/51/6/063012 (literal)

Alternative label

L. Piron; L. Grando; G. Marchiori; L. Marrelli; P. Piovesan; A. Soppelsa; D. Terranova (2011)
Dynamic decoupling and multi-mode magnetic feedback for error field correction in RFX-mod
in Nuclear fusion; International Atomic Energy Agency, Vienna (Austria)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

L. Piron; L. Grando; G. Marchiori; L. Marrelli; P. Piovesan; A. Soppelsa; D. Terranova (literal)

Pagina inizio

063012 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni

Article Number: 063012 - La rivista è pubblicata anche online con ISSN 1741-4326. (literal)

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http://iopscience.iop.org/0029-5515/51/6/063012/ (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

51 (literal)

Rivista

Nuclear fusion (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note

Issue 6, Article Number 063012 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

8 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

6 (literal)

Note

Scopu (literal)
ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

Consorzio RFX, Euratom-ENEA Association, Corso Stati Uniti 4, 35127 Padova, Italy (literal)

Titolo

Dynamic decoupling and multi-mode magnetic feedback for error field correction in RFX-mod (literal)

Abstract

Magnetic field errors can have a significant impact on the confinement properties of magnetized fusion plasmas. In the RFX-mod reversed-field pinch (Sonato et al 2003 Fusion Eng. Des. 33 161) a significant error field is produced during the current ramp by the eddy currents induced in the 3D wall structures, such as the gaps and some large portholes, by the temporal variation of the vertical magnetic field. A set of 192 magnetic sensors and 192 active coils allowed accurate identification of the error field spatiotemporal pattern and its correction. The correction scheme combines pre-programmed current waveforms and multi-mode magnetic feedback. The pre-programmed currents were computed with the dynamic decoupling algorithm developed in Soppelsa et al (2008 Fusion Eng. Des. 83 224). This accounts for the mutual interaction between different feedback coils and magnetic sensors, which is affected by the frequency-dependent response of the 3D wall structures to external magnetic fields. At the same time, multi-mode magnetic feedback is applied to the main error field harmonics. During the current ramp, multiple tearing modes are normally phase-locked and produce a toroidally localized deformation of the plasma column that tends to grow where the error fields are larger. With error field correction, this deformation does not grow at preferred positions, thus avoiding the plasma-wall interaction being too localized there. In general, the decoupling approach used in this work may find applications in other machines. (literal)

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