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A statistical analysis of pulsed poloidal current drive in the Reversed Field eXperiment (Articolo in rivista)

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A statistical analysis of pulsed poloidal current drive in the Reversed Field eXperiment (Articolo in rivista) (literal)

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A. Cravotta; G. Spizzo; D. Terranova; T. Bolzonella; P. Franz; L. Marrelli; P. Martin; S. Martini; S. Ortolani (2003)
A statistical analysis of pulsed poloidal current drive in the Reversed Field eXperiment
in Physics of plasmas
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A. Cravotta; G. Spizzo; D. Terranova; T. Bolzonella; P. Franz; L. Marrelli; P. Martin; S. Martini; S. Ortolani (literal)

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A study of a set of RFX plasma discharges where Pulsed Poloidal Current Drive (PPCD) was applied is presented. The RFX machine is the most important Reversed Field Pinch experiment in the world. The RFP magnetic configuration is actively studied in the framework of a collaboration between Europe, USA and Japan. It has important advantages as a scheme for realising a low magnetic field reactor and it is also of interest for interdisciplinary studies such as those related to magnetohydrodynamic (MHD) turbulence. PPCD is a technique to shape the internal magnetic field profile with the aim of controlling the amplitude of the magnetic perturbation due to MHD instabilities. In this way the performance of the plasma are greatly improved. One of the achievement of the paper is an analysis of the relationship between the improved confinement and the modification of the spectrum and amplitude of the MHD modes. The results of the paper are valid in general for the RFP configuration. (literal)

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Università di Padova, CNR ed ENEA hanno costituito il Consorzio RFX per realizzare congiuntamente attività di ricerca sulla fusione nucleare controllata. Il personale resta dipendente dal proprio ente, precisato nel campo ?affiliazione autori?. (literal)

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Pulsed poloidal current drive (PPCD) experiments have been performed in the reversed-field pinch device RFX [G. Rostagni, Fus. Eng. Design 25, 301 (1995)], with various control techniques of the edge toroidal field. A detailed statistical analysis has been performed over ~430 RFX pulses and is presented in this paper. We have found that the temperature increase and m = 1 fluctuations reduction scale with the applied electric field Ewhich is a control parameter for plasma performances. Soft x-ray imaging shows an increase in the core, where often an m = 1 helical coherent structure appears, similar to those observed during quasi-single helicity states in RFX. These phenomena are ultimately linked to the magnetic turbulence reduction and q profile modifications that take place during PPCD in the reversed-field pinch. (literal)

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Cravotta, Martin: Consorzio RFX, Associazione EURATOM-ENEA sulla Fusione Corso Stati Uniti, 4 35127 Padova, Italy and Dipartimento di Fisica, Universita` di Padova, Via F. Marzolo, 8 35131 Padova, Italy; Spizzo, Terranova, Bolzonella, Franz, Marrelli, Martini, Ortolani: Consorzio RFX, Associazione EURATOM-ENEA sulla Fusione Corso Stati Uniti, 4 35127 Padova, Italy. (literal)

Titolo

A statistical analysis of pulsed poloidal current drive in the Reversed Field eXperiment (literal)

Abstract

Pulsed poloidal current drive (PPCD) experiments have been performed in the reversed-field pinch device RFX [G. Rostagni, Fus. Eng. Design 25, 301 (1995)], with various control techniques of the edge toroidal field. A detailed statistical analysis has been performed over ~430 RFX pulses and is presented in this paper. We have found that the temperature increase and m = 1 fluctuations reduction scale with the applied electric field E which is a control parameter for plasma performances. Soft x-ray imaging shows an increase in the core, where often an m = 1 helical coherent structure appears, similar to those observed during quasi-single helicity states in RFX. These phenomena are ultimately linked to the magnetic turbulence reduction and q profile modifications that take place during PPCD in the reversed-field pinch. (literal)

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