Ripple loss of suprathermal alpha particles during slowing-down in a tokamak reactor
- 1 May 1983
- journal article
- Published by IOP Publishing in Nuclear Fusion
- Vol. 23 (5) , 657-665
- https://doi.org/10.1088/0029-5515/23/5/007
Abstract
The slowing-down process of suprathermal alpha particles in a rippled toroidal field is investigated by means of an orbit-following Monte-Carlo code. It is found that numerical results on the collisionless ripple loss agree fairly well with the theoretical predictions. The collisional diffusion coefficient for non-ergodic banana particles in a field ripple is derived. The ripple-enhanced power loss of alpha particles during slowing-down amounts to 10% of their total power in a reactor-grade tokamak with a toroidal-field ripple of δ ~ 1%. The fraction of particle loss is 1.5 to 1.8 times as large as that of power loss. The ripple-enhanced banana drift dominates the alpha-particle loss process.Keywords
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