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1.
  • Bécoulet, A., et al. (författare)
  • Science and technology research and development in support to ITER and the Broader Approach at CEA
  • 2013
  • Ingår i: Nuclear Fusion. - : IOP Publishing. - 1741-4326 .- 0029-5515. ; 53:10
  • Tidskriftsartikel (refereegranskat)abstract
    • In parallel to the direct contribution to the procurement phase of ITER and Broader Approach, CEA has initiated research & development programmes, accompanied by experiments together with a significant modelling effort, aimed at ensuring robust operation, plasma performance, as well as mitigating the risks of the procurement phase. This overview reports the latest progress in both fusion science and technology including many areas, namely the mitigation of superconducting magnet quenches, disruption-generated runaway electrons, edge-localized modes (ELMs), the development of imaging surveillance, and heating and current drive systems for steady-state operation. The WEST (W Environment for Steady-state Tokamaks) project, turning Tore Supra into an actively cooled W-divertor platform open to the ITER partners and industries, is presented.
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2.
  • Singh, Rameswar, et al. (författare)
  • Symmetry breaking effects of density gradient on parallel momentum transport: A new ρ* effect
  • 2012
  • Ingår i: Physics of Plasmas. - : AIP Publishing. - 1089-7674 .- 1070-664X. ; 19:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Symmetry breaking effects of density gradient on parallel momentum transport is studied via quasilinear theory. It is shown that finite (equivalent to rho(s)/L-n), where rho(s) is ion sound radius and L-n is density scale length, leads to symmetry breaking of the ion temperature gradient (ITG) eigenfunction. This broken symmetry persists even in the absence of mean poloidal (from radial electric field shear) and toroidal flows. This effect, as explained in the text, originates from the divergence of polarization particle current in the ion continuity equation. The form of the eigenfunction allows the microturbulence to generate parallel residual stress via symmetry breaking. Comparison with the (E) over right arrow x (B) over right arrow shear driven parallel residual stress, parallel polarization stress and turbulence intensity gradient driven parallel residual stress are discussed. It is shown that this rho(s)* driven parallel residual stress may become comparable to (E) over right arrow x (B) over right arrow shear driven parallel residual stress in small L-n region. In the regular drift wave ordering, where rho(s)*
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