Tearing mode control in the RFX-mod device (Abstract/Comunicazione in atti di convegno)

  • Tearing mode control in the RFX-mod device (Abstract/Comunicazione in atti di convegno) (literal)
  • 2013-01-01T00:00:00+01:00 (literal)
Alternative label
  • Lidia Piron; Paolo Zanca; Lionello Marrelli; Paolo Piovesan (2013)
    Tearing mode control in the RFX-mod device
    in Joint 19th ISHW and 16th IEA-RFP workshop, Padova, Italy, September 16-20, 2013
  • Lidia Piron; Paolo Zanca; Lionello Marrelli; Paolo Piovesan (literal)
  • http://www.igi.cnr.it/ish_rfp_ws2013/sites/default/files/attachments/02_Detailed%20programme_chair.pdf; Oral O26, 20 min. (literal)
  • http://www.igi.cnr.it/ish_rfp_ws2013/sites/default/files/attachments/12_BookOfAbstracts.pdf (literal)
  • Comunicazione (literal)
  • Consorzio RFX, Associazione EURATOM-ENEA sulla Fusione, 35127 Padova, Italy (literal)
  • Tearing mode control in the RFX-mod device (literal)
  • In the last years, the RFX-mod experiment has given important insights into the physical mechanisms that rule the tearing mode dynamics in p resence of magnetic feedback control. The RFX-mod device is suitable for the study of this to pic: it is equipped with 192 active coils and a corresponding grid of radial, toroidal and poloidal field sensors, which allow a good detection of unstable modes. Several feedback schemes for tearin g mode control on RFX have been modelled through the RFXlocking code [1,2] and tested in rev ersed field pinch experiments: from the intelligent shell concept to the clean mode control [1,3,4,5]. The experience acquired on tearing mode control recently has been exported in tokamak plasmas. Common features between such magnetic configurations have been observed on teari ng mode control. The most important common denominator is the importance of the removal from t he feedback variable of sideband harmonics, induced by the discrete nature of the active coils, in order to have an effective action on such instabilities. In both RFP and tokamak experiments , the magnetic feedback system reduces tearing mode amplitude at the plasma edge and maintains the mode into rotation in the slow frequency branch, of about 10-100Hz. The magnetic feedback va riable can also be set to maintain the mode amplitude at a finite value, by means of helical bo undary conditions, either rotating or static. On th e other hand the feedback action can not fully suppre ss a tearing mode, but it can at its best replicate the effect of an ideal shell located at the resisti ve shell radius. RFXlocking outcomes suggest that i f certain physics players are neglected in the moment um balance equation, such as the electro- magnetic torque due to the conductive structures an d the feedback, as well as the viscous torque related to the plasma flow, as proposed in [6], tea ring modes can indeed be stabilized against the RFX-mod experimental evidences. References [1] Zanca P. et al 2007 Nucl. Fusion 47 1425 [2] Zanca P. 2009 Plasma Phys. Control. Fusion 51 015006 [3] Martini S. et al 2007 Nucl. Fusion 47 783 [4] Marrelli L. et al 2007 Plasma Phys. Control. Fu sion 49 B359 [5] Piron L. et al 2010 Nucl. Fusion 50 115011 [6] Richardson A.S. et al 2010 Phys. Plasmas 17 112511 (literal)
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