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Sökning: WFRF:(Hynönen V.)

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1.
  • Johnson, T., 1974-, et al. (författare)
  • Modelling of Fast Particle Transport and Losses with TF Ripple in JET
  • 2007
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • In preparation for ripple experiments at JET the heat loads from fast ions to plasma facing components were calculated by orbit following Monte Carlo codes. The calculations show that losses are generated by two mechanisms, ripple-trapping and ripple-banana diffusion, and that the heat loads could cause damage to plasma facing components. During the experiments the auxiliary power was therefore kept below the limits inferred from the simulations. Measurements of the losses of fast ions from NBI using visible-light and infrared cameras have been shown to be in agreement with the predictions from the simulations. Finally, interactions between fast ions and the non-axisymmetric magnetic field are shown to generate a toroidal torque, which in JET with ~1% ripple is of the same order as that from neutral beam injection.
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2.
  • Johnson, Thomas, et al. (författare)
  • Numerical Modelling of Ripple Induced Transport
  • 2006
  • Ingår i: Proceedings of the 33rd EPS Conference on Plasma Physics. - 9781622763337 ; , s. 408-411
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • The ASCOT code has been used to analyse transport and calculate the thermal conductivity in plasmas with toroidal field ripple. The scaling of the thermal conductivity with dimensionless plasma parameters is similar to transport in the ripple plateau regime [1]. The ripple in machines with toroidal field coils similar to those in JET and JT-60U are quite different; while the maximum ripple is larger with 16 JET coils, the ripple at the X-point is larger with the JT-60U coils. The results are that the heat conductivity is similar in the two plasmas, while the particle losses are higher with the JT-60U coils.
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4.
  • Kurki-Suonio, T., et al. (författare)
  • Fast particle losses in ITER
  • 2008
  • Ingår i: EPS Conf. Plasma Phys., EPS - Europhys. Conf. Abstr.. - 9781622763351 ; , s. 117-120
  • Konferensbidrag (refereegranskat)
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  • Resultat 1-5 av 5

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