MAGNETIC TURBULENCE, ERGODICITY AND TEST PARTICLE TRANSPORT IN TOKAMAKS
An investigation of very low frequency magnetic fluctuations in a two-fluid model is carried out. This shows that such modes do not make a significant contribution to cross field transport. Test particle diffusion due to an ensemble of quasi-static fluctuations is discussed. It is found that there are significant differences in the low collisionality limit between periodic and infinite systems. Necessary conditions for field line ergodicity due to equilibrium constraints are derived. A novel asymptotic magnetic surface construction is used to derive bounds on test particle diffusion, where all relevant time scales are taken into account.
Bibliographic Reference: WRITE TO THE LIBRARY, UKAEA, CULHAM LABORATORY, ABINGDON, OXON OX14 3DB (UK), MENTIONING REPORT CLM-P 700, 1983
Record Number: 1989122049200 / Last updated on: 1987-01-01
Available languages: en