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Fast particle-driven waves in the ion cyclotron frequency range (ioncyclotron emission or ICE) have provided a valuable diagnostic of confined andescaping fast ions in many tokamaks. This is a passive, non-invasive diagnosticthat would be compatible with the high radiation environment ofdeuterium-tritium plasmas in ITER, and could provide important information onfusion {\alpha}-particles and beam ions in that device. In JET, ICE fromconfined fusion products scaled linearly with fusion reaction rate over sixorders of magnitude and provided evidence that {\alpha}-particle confinementwas close to classical. In TFTR, ICE was observed from super-Alfv\'enic{\alpha}-particles in the plasma edge. The intensity of beam-driven ICE inDIII-D is more strongly correlated with drops in neutron rate during fishboneexcitation than signals from more direct beam ion loss diagnostics. In ASDEXUpgrade ICE is produced by both super-Alfv\'enic DD fusion products andsub-Alfv\'enic deuterium beam ions.

Fast particle-driven ion cyclotron emission (ICE) in tokamak plasmas and the case for an ICE diagnostic in ITER