http://www.cnr.it/ontology/cnr/individuo/prodotto/ID25776

Analysis and modelling of plasma response to pellet injection in RFX (Articolo in rivista)

Type

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

Label

Analysis and modelling of plasma response to pellet injection in RFX (Articolo in rivista) (literal)

Anno

2002-01-01T00:00:00+01:00 (literal)

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

10.1088/0741-3335/44/2/307 (literal)

Alternative label

R. Lorenzini, L. Garzotti, B. Pégourié, P. Innocente, S. Martini (2002)
Analysis and modelling of plasma response to pellet injection in RFX
in Plasma physics and controlled fusion (Print)
(literal)

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

R. Lorenzini, L. Garzotti, B. Pégourié, P. Innocente, S. Martini (literal)

Pagina inizio

233 (literal)

Pagina fine

252 (literal)

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

Particle and energy transport in RFX discharges where Pulsed Poloidal Current Drive (PPCD) was combined with pellet injection is analysed. The RFX machine is the most important Reversed Field Pinch (RFP) experiment in the world. The RFP configuration is actively studied in Europe, USA and Japan. It has important advantages as a scheme for realising a low magnetic field reactor and it is also of high scientific interest for interdisciplinary studies such as those related magneto-hydro-dynamic (MHD) turbulence. The best performance of RFX has been observed in combined pellet/PPCD experiments. A quantitative analysis was done by comparing the behaviour of the plasma with the results of several runs of a 1-dimensional diffusion code. It confirmed and explained the optimum conditions empirically found in order to achieve the maximum synergy between pellet injection and PPCD. The results of the paper are valid in general for RFPs and are of great interest for the research on the subject. (literal)

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http://iopscience.iop.org/0741-3335/44/2/307/ (literal)

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

44 (literal)

Rivista

Plasma physics and controlled fusion (Rivista)

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

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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20 (literal)

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2 (literal)

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Pellet injection experiments have been performed on the RFX reversed field pinch (RFP). The aim of the experimental campaign was to get information both on the possibility of an efficient pellet fuelling of the plasma and on the associated transport modification. In this paper, we present an analysis of different experimental scenarios. The tool employed is a one-dimensional transport code coupled with an ablation calculation that yields the pellet particle source and trajectory. In standard plasmas the pellets that reach the plasma centre trigger a phase of rapid profile flattening and poorer particle and energy confinement. An increase of the transport coefficients is required to reproduce the post-pellet behaviour of the profiles. On the other hand, the slow pellets that suffer large deflection and miss the plasma centre do not have such a deleterious effect and, in this case, the unperturbed transport coefficients are able to reproduce the post-pellet evolution of the profiles. Finally, when the pellets are launched in combination with some method that induces an improved confinement, the transport degradation is less evident. In our case, pellet injection has been combined with pulsed poloidal current drive (PPCD), a technique that reduces magnetic field stochasticization and transport in the RFP core. When the effect of the PPCD is strong enough, a synergy between pellet injection and PPCD is observed and plasma fuelling without confinement reduction is possible. (literal)

Note

ISI Web of Science (WOS) (literal)

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

1 Consorzio RFX, Associazione Euratom-ENEA sulla Fusione, corso Stati Uniti 4, 35127 Padova, Italy; 2 CEA Cadarache, DRFC, 13108 Saint-Paul-lez-Durance, France. (R. Lorenzini 1, L. Garzotti 1, B. Pégourié 2, P. Innocente 1, S. Martini 1) (literal)

Titolo

Analysis and modelling of plasma response to pellet injection in RFX (literal)

Abstract

Pellet injection experiments have been performed on the RFX reversed field pinch (RFP). The aim of the experimental campaign was to get information both on the possibility of an efficient pellet fuelling of the plasma and on the associated transport modification. In this paper, we present an analysis of different experimental scenarios. The tool employed is a one-dimensional transport code coupled with an ablation calculation that yields the pellet particle source and trajectory. In standard plasmas the pellets that reach the plasma centre trigger a phase of rapid profile flattening and poorer particle and energy confinement. An increase of the transport coefficients is required to reproduce the post-pellet behaviour of the profiles. On the other hand, the slow pellets that suffer large deflection and miss the plasma centre do not have such a deleterious effect and, in this case, the unperturbed transport coefficients are able to reproduce the post-pellet evolution of the profiles. Finally, when the pellets are launched in combination with some method that induces an improved confinement, the transport degradation is less evident. In our case, pellet injection has been combined with pulsed poloidal current drive (PPCD), a technique that reduces magnetic field stochasticization and transport in the RFP core. When the effect of the PPCD is strong enough, a synergy between pellet injection and PPCD is observed and plasma fuelling without confinement reduction is possible. (literal)

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