Internal transport barrier studies in the FTU (Articolo in rivista)

Type

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

Label

• Internal transport barrier studies in the FTU (Articolo in rivista) (literal)

Anno

• 2004-01-01T00:00:00+01:00 (literal)

Alternative label

• Barbato E., Pericoli-Ridolfini V., Castaldo C., Esposito B., Giovannozzi E., Gormezano C., Granucci G., Leigheb M., Marinucci M., Mirizzi F., Panaccione L., Podda S., Romanelli M., Smeulders P. Sozzi C. (2004)
  Internal transport barrier studies in the FTU
  in Fusion science and technology (Online)
  (literal)

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

• Barbato E., Pericoli-Ridolfini V., Castaldo C., Esposito B., Giovannozzi E., Gormezano C., Granucci G., Leigheb M., Marinucci M., Mirizzi F., Panaccione L., Podda S., Romanelli M., Smeulders P. Sozzi C. (literal)

Pagina inizio

• 323 (literal)

Pagina fine

• 338 (literal)

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

• http://epubs.ans.org/?a=517 (literal)

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

• 45 (literal)

Rivista

• Fusion science and technology (Rivista)

Note

• ISI Web of Science (WOS) (literal)

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

• [ 1 ] EURATOM, ENEA Fus, CR Frascati, Rome, Italy [ 2 ] EURATOM, ENEA Fus, Ist Fiz Plasma, Milan, Italy (literal)

Titolo

• Internal transport barrier studies in the FTU (literal)

Abstract

• Strong electron internal transport barriers (ITBs) are obtained in the Frascati Tokamak Upgrade (FTU) with the combined injection of lower hybrid (LH) (up to 1.9 MW) and electron cyclotron (EC) (up to 0.8 MW) radio-frequency waves. ITBs occur during either the current plateau or the ramp-up phase, both in full and partial current drive (CD) regimes, up to n(e0) > 1.4 x 10(20) m(-3), relevant to ITER operation. Central electron temperatures T-e0 > 8 keV, at n(e0) approximate to 0.8 x 10(20) m(-3), are sustained for up to 36 confinement times. The ITB extends over a region where a slightly reversed magnetic shear is established by off-axis LHCD and can be even larger than r/a = 0.5. EC power is used either to benefit from this improved confinement by heating inside the ITB or to enhance the peripheral LH power deposition and CD with off-axis resonance. Collisional ion heating is also observed, but thermal equilibrium with the electrons is not attained since the electron-ion equipartition time is always 4 to 5 times longer than the energy confinement time. An extensive transport modeling of these discharges, performed by means of the ASTRA code, is also presented. During the ITB phase, the ion diffusivity is close to the neoclassical value while the electron shear-dependent Bohm-gyro-Bohm model accounts quite well for T-e(r, t), The Ray Tracing Fokker-Planck model, used to describe the LHCD physics, appears satisfactory, to analyze and interpret the experimental results. It turns out that the barrier radius is mainly influenced by the LHCD deposition. In particular, a wider barrier is obtained the lower q(a) is and the larger the plasma density is. (literal)

Prodotto di

• Institute for plasma physics \"Piero Caldirola\" (IFP) (Istituto)

Autore CNR

• CARLO SOZZI (Unità di personale interno)
• GUSTAVO GRANUCCI (Unità di personale interno)

Incoming links:

Autore CNR di

• GUSTAVO GRANUCCI (Unità di personale interno)
• CARLO SOZZI (Unità di personale interno)

Prodotto

• Institute for plasma physics \"Piero Caldirola\" (IFP) (Istituto)

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

• Fusion science and technology (Rivista)