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Sökning: WFRF:(Ochoukov R.) > (2023)

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1.
  • Ochoukov, R., et al. (författare)
  • Analysis of high frequency Alfven eigenmodes observed in ASDEX Upgrade plasmas in the presence of RF-accelerated NBI ions
  • 2023
  • Ingår i: Nuclear Fusion. - : IOP Publishing. - 0029-5515 .- 1741-4326. ; 63:4, s. 046001-
  • Tidskriftsartikel (refereegranskat)abstract
    • High frequency Alfven eigenmodes in the ion cyclotron frequency range are actively researched on the ASDEX Upgrade tokamak (AUG). The general properties of this particular mode type are: (a) the mode is beam-driven and, if excited, can persist for the entire duration of the beam-on time window; (b) the mode is sub-cyclotron with the frequency omega similar to 0.5 omega (ci), where omega(ci) corresponds to the on-axis cyclotron frequency of the beam ions;
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2.
  • Bilato, A., et al. (författare)
  • Impact of ICRF fast-ions on core turbulence and MHD activity in ASDEX upgrade
  • 2023
  • Ingår i: 24th Topical Conference On Radio-Frequency Power In Plasmas. - : AIP Publishing.
  • Konferensbidrag (refereegranskat)abstract
    • Experiments in various tokamaks and their analysis identify the fast ions (FI) generated by NBI and/or ICRF heating as one of the main causes of the observed improvement in core confinement: fast ions can reduce core microturbulence (mainly Ion-Temperature-Gradient (ITG) driven modes) either electrostatically or electromagnetically, or they can resonate with fishbones and high-frequency Alfvén modes, which in turn contribute in stabilizing ITG. In this perspective, we discuss recent experiments done on ASDEX Upgrade (AUG) where ICRF is the main actuator for FI generation for energies above 100 keV. Additionally, ICRF-FIs can substantially impact the MHD activity and its consequent effects on fast ion losses (FILs) and ion-cyclotron emission (ICE). We present dedicated AUG experiments with NBI-D further accelerated by ICRF.
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