Abstract
Physics knowledge (theory and experiment) in energetic particlesrelevant to design of a reactor scale tokamak is reviewed, and projections forITER are provided in this Chapter of the ITER Physics Basis. The reviewincludes single particle effects such as classical alpha particle heating andtoroidal field ripple loss, as well as collective instabilities that might begenerated in ITER plasmas by energetic alpha particles. The overall conclusionis that fusion alpha particles are expected to provide an efficient plasmaheating for ignition and sustained burn in the next step device. The majorconcern is localized heat loads on the plasma facing components produced byalpha particle loss, which might affect their lifetime in a tokamak reactor.
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