Articolo in rivista, 2018, ENG, 10.1088/1741-4326/aaa781
De Masi G.; Predebon I.; Spagnolo S.; Meneses L.; Delabie E.; Lupelli I.; Hillesheim J.C.; Maggi C.
EUROfusion Consortium, JET, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom; 1,2,3: Consorzio RFX, Corso Stati Uniti 4, 35127 Padova, Italy; 4: Instituto de Plasmas e Fusão Nuclear, Instituto Superior Tecnico, Universidade de Lisboa, Lisboa, Portugal; 5: Oak Ridge National Laboratory, Oak Ridge, TN 37831-6169, United States of America; 6,7,8: CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom.
Density and magnetic fluctuation measurements in low-? type-III ELM discharges are obtained in the Joint European Torus (JET). They are observed during the inter-ELM pedestal evolution, after the LH transition phase, at about 60-70 kHz. Density fluctuations are measured with a correlation reflectometer system installed on the low-field side and they are localized at the pedestal top. Magnetic fluctuations with a spatial scale are measured through a high resolution coil array. The main features and the relations with local plasma parameters are presented. The nature of these fluctuations is discussed along with linear gyrokinetic simulations. Ion temperature gradient (ITG) modes are the dominant instabilities in the frequency range of interest. In terms of radial localization, typical oscillation frequency and qualitative relation with the possible linear drive, ITG modes are consistent with the experimental density fluctuations measurements. Micro-tearing modes (MTMs), found unstable with a lower growth rate, appear a possible explanation for magnetic fluctuations in terms of typical wavenumbers and direction of propagation.
Nuclear fusion 58 (4), pp. 046007-1–046007-11
gyrokinetic simulations, ITG, JET, magnetic measurements, pedestal flcutuations, reflectometry, turbulence measurements
ID: 387028
Year: 2018
Type: Articolo in rivista
Creation: 2018-05-04 14:18:28.000
Last update: 2020-04-07 12:32:31.000
CNR authors
CNR institutes
External links
OAI-PMH: Dublin Core
OAI-PMH: Mods
OAI-PMH: RDF
URL: http://iopscience.iop.org/article/10.1088/1741-4326/aaa781/meta
External IDs
CNR OAI-PMH: oai:it.cnr:prodotti:387028
DOI: 10.1088/1741-4326/aaa781
Scopus: 2-s2.0-85044958991
ISI Web of Science (WOS): 000424504400007