ITBs dynamics in helical RFX-mod states by high time resolution Te measurements (Abstract/Comunicazione in atti di convegno)

Type
Label
  • ITBs dynamics in helical RFX-mod states by high time resolution Te measurements (Abstract/Comunicazione in atti di convegno) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Alternative label
  • M. Gobbin; A. Fassina; P. Franz; L. Marrelli; B. Momo; I. Predebon; A. Ruzzon; R. Sanchez; D. Terranova; M. Zuin (2013)
    ITBs dynamics in helical RFX-mod states by high time resolution Te measurements
    in Joint 19th ISHW and 16th IEA-RFP workshop, Padova, Italy, September 16-20, 2013
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • M. Gobbin; A. Fassina; P. Franz; L. Marrelli; B. Momo; I. Predebon; A. Ruzzon; R. Sanchez; D. Terranova; M. Zuin (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni
  • http://www.igi.cnr.it/ish_rfp_ws2013/sites/default/files/attachments/02_Detailed%20programme_chair.pdf; Oral O8 20 min. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://www.igi.cnr.it/ish_rfp_ws2013/sites/default/files/attachments/12_BookOfAbstracts.pdf (literal)
Note
  • Comunicazione (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1,2,3,4,5,6,7,9,10 : Consorzio RFX, Associazione EURATOM-ENEA sulla Fusione, Padova, Italy / 8 : Universidad Carlos III de Madrid, Department of Physics, Madrid, Spain. (literal)
Titolo
  • ITBs dynamics in helical RFX-mod states by high time resolution Te measurements (literal)
Abstract
  • Electron Internal Transport Barriers (eITBs) in the core of RFX-mod plasmas with 3D helical magnetic topology are characterized by a complex dy namics which has been recently observed in detail thanks to the high time resolution T e measurements obtained by double filter technique wi th a multichords soft-x-ray (SXR) diagnostic 1 . The evolution of temperature profiles during heli cal states are used as input for heat transport analysi s in order to determine the electron thermal diffusivity evolution across the helical magnetic s urfaces for several cases of eITBs dynamics, with a special attention to those phases where the therm al structures are growing/disappearing or when the helical topology is being lost. In fact, thermal structures with important T e gradients do not persist for the entire duration of the magnetic helical states but show an intermit tent behaviour. A statistical approach has been implemented in order to investigate what causes the partial or definitive end of eITBs. Such a study has revealed different time scales involved for mag netic and thermal plasma properties; in particular, the increase of the magnetic chaos and the partial loss of the helical magnetic topology usually occur in a phase where the electron tempera ture gradient is already decreasing. For a deeper understanding of this phenomenology, more mechanism s having a role in the deterioration of thermal structures are taken into consideration: fo r instance the microtearing perturbations, measured by pick up coils at the edge of RFX-mod, o r the pressure driven instabilities, analyzed by using the stability COBRA code 2 . References [1] P.Franz et al., Nucl. Fusion 53 (2013) 053011 [2] R. Sanchez et al., Computer Physics Communicati ons 141 (2001) 55-65 (literal)
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