http://www.cnr.it/ontology/cnr/individuo/prodotto/ID25997

Model-based design of multi-mode feedback control in the RFX-mod experiment (Articolo in rivista)

Type

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

Label

Model-based design of multi-mode feedback control in the RFX-mod experiment (Articolo in rivista) (literal)

Anno

2010-01-01T00:00:00+01:00 (literal)

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

10.1088/0029-5515/50/11/115011 (literal)

Alternative label

Piron L.; Marrelli L.; Piovesan P.; Zanca P. (2010)
Model-based design of multi-mode feedback control in the RFX-mod experiment
in Nuclear fusion; International Atomic Energy Agency, Vienna (Austria)
(literal)

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

Piron L.; Marrelli L.; Piovesan P.; Zanca P. (literal)

Pagina inizio

115011 (literal)

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

Article Number: 115011. La rivista è pubblicata anche online con ISSN 1741-4326. (literal)

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

http://iopscience.iop.org/0029-5515/50/11/115011/ (literal)

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

50 (literal)

Rivista

Nuclear fusion (Rivista)

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

Issue 11, Article Number 115011 (literal)

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

10 (literal)

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

11 (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

Model-based design of multi-mode feedback control in the RFX-mod experiment (literal)

Abstract

Interest in real-time control of magnetic field errors and magnetohydrodynamic (MHD) instabilities has been growing in the last decades due to the demanding stability requirements of high-performance scenarios in fusion devices. In this framework, the RFX-mod experiment (Sonato et al 2003 Fusion Eng. Des. 66 161) plays an important role. One of the main goals of RFX-mod is to explore high-plasma current regimes up to 2MA for the first time in a reversedfield pinch. To this aim, RFX-mod is equipped with an advanced active coil system for the control of error fields and MHD modes, such as tearing and resistive-wall modes. As far as tearing modes are concerned, both controlling their edge radial magnetic field and maintaining them into slow (~10-100 Hz) rotation are crucial to reduce both the plasma-wall interaction and the core magnetic stochasticity. In this paper, a model-based optimization of the RFXmod feedback control is presented. The aim is to find an optimal gain set for a spectrum of multiple tearing modes, which produces the lowest possible value of the edge radial magnetic field, maintaining at the same time the modes into slow rotation and avoiding coil current saturations. These optimal gains have first been calculated offline by simulating the non-linear dynamics of a spectrum of tearing modes interacting through viscous and electromagnetic torques, using an adaptation to the RFX-mod multiple-shell layout of the model described in Zanca (2009 Plasma Phys. Control. Fusion 51 015006). This gain set has been obtained by scanning the proportional and derivative gains and has been tested in an extensive experimental campaign, showing good agreement with the model. With this approach, a reduction in the edge radial magnetic field up to 15%, with respect to discharges in which an empirical optimization was used, has been obtained. The above model proved to be a powerful tool to tune a multi-mode controller offline, which allowed us to save a large amount of experimental time. (literal)

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