Safety-factor profile tailoring by improved electron cyclotron system for sawtooth control and reverse shear scenarios in ITER (Contributo in atti di convegno)

Type
Label
  • Safety-factor profile tailoring by improved electron cyclotron system for sawtooth control and reverse shear scenarios in ITER (Contributo in atti di convegno) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1063/1.3033728 (literal)
Alternative label
  • Zucca C. , Sauter O., Henderson M.A., Fable E., Farina D., Ramponi G., Saibene G., Zohm H. (2008)
    Safety-factor profile tailoring by improved electron cyclotron system for sawtooth control and reverse shear scenarios in ITER
    in Theory of Fusion Plasmas, Varenna, Italy, 25-29 August 2008
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Zucca C. , Sauter O., Henderson M.A., Fable E., Farina D., Ramponi G., Saibene G., Zohm H. (literal)
Pagina inizio
  • 361 (literal)
Pagina fine
  • 367 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://proceedings.aip.org/resource/2/apcpcs/1069/1/361_1 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#titoloVolume
  • THEORY OF FUSION PLASMAS (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • AIP Conference Proceedings 1069, 361-367 (2008) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Istituto di Fisica del Plasma, CNR Milano, ed altri istituti di ricerca (literal)
Titolo
  • Safety-factor profile tailoring by improved electron cyclotron system for sawtooth control and reverse shear scenarios in ITER (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#isbn
  • 2-914771-52-5 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#curatoriVolume
  • Olivier Sauter, Xavier Garbet, Elio Sindoni (literal)
Abstract
  • The effect of the predicted local electron cyclotron current driven by the optimized electron cyclotron system on ITER is discussed. A design variant was recently proposed to enlarge the physics program covered by the upper and equatorial launchers. By extending the functionality range of the upper launcher, significant control capabilities of the sawtooth period can be obtained. The upper launcher improvement still allows enough margin to exceed the requirements for neoclassical tearing mode stabilization, for which it was originally designed. The analysis of the sawtooth control is carried on with the ASTRA transport code, coupled with the threshold model by Por-celli, to study the control capabilities of the improved upper launcher on the sawtooth instability. The simulations take into account the significant stabilizing effect of the fusion alpha particles. The sawtooth period can be increased by a factor of 1.5 with co-ECCD outside the q = 1 surface, and decreased by at least 30% with co-ECCD inside q = 1. The present ITER base-line design has the electron cyclotron launchers providing only co-ECCD. The variant for the equatorial launcher proposes the possibility to drive counter-ECCD with 1 of the 3 rows of mirrors: the counter-ECCD can then be balanced with co-ECCD and provide pure ECH with no net driven current. The difference between full co-ECCD off-axis using all 20MW from the equatorial launcher and 20MW co-ECCD driven by 2/3 from the equatorial launcher and 1/3 from the upper launcher is shown to be negligible. Cnt-ECCD also offers greater control of the plasma current density, therefore this analysis addresses the performance of the equatorial launcher to control the central q profile. The equatorial launcher is shown to control very efficiently the value of q0.2-qmin in advanced scenarios, if one row provides counter-ECCD. (literal)
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