Fast particle-driven ion cyclotron emission (ICE) in tokamak plasmas and   the case for an ICE diagnostic in ITER
  Fast particle-driven waves in the ion cyclotron frequency range (ion cyclotron emission or ICE) have provided a valuable diagnostic of confined and escaping fast ions in many tokamaks. This is a passive, non-invasive diagnostic that would be compatible with the high radiation environment of deuterium-tritium plasmas in ITER, and could provide important information on fusion {\alpha}-particles and beam ions in that device. In JET, ICE from confined fusion products scaled linearly with fusion reaction rate over six orders of magnitude and provided evidence that {\alpha}-particle confinement was close to classical. In TFTR, ICE was observed from super-Alfv\'enic {\alpha}-particles in the plasma edge. The intensity of beam-driven ICE in DIII-D is more strongly correlated with drops in neutron rate during fishbone excitation than signals from more direct beam ion loss diagnostics. In ASDEX Upgrade ICE is produced by both super-Alfv\'enic DD fusion products and sub-Alfv\'enic deuterium beam ions. 
K.G. McClements, R. D'Inca, R.O. Dendy, L. Carbajal, S.C. Chapman,   J.W.S. Cook, R.W. Harvey, W.W. Heidbrink, S.D. Pinches
physics.plasm-ph