- Conference date: 7–9 May 2007
- Location: Clearwater (Florida)
MHD‐induced losses of fast ions with energy in the MeV range have been observed during high‐power ICRF heating of hydrogen minority ions in the ASDEX Upgrade tokamak ICRF heating and ICRF‐driven fast ions in discharges exhibiting fast ion losses due to toroidal Alfvén eigenmodes and a new core‐localised MHD instability are analysed. It is found that the lost ions are ICRF‐accelerated trapped protons with energy in the range of 0.3–1.6 MeV, orbit widths of 20–35 cm, and turning points at and at major radii close to the cyclotron resonance The presence of such protons is consistent with ICRF modelling.
- Instability analysis
- Cyclotron resonances
- Normal modes
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