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Abstract

Linear stability properties of the ideal internal kind mode in toroidal geometry are calculated for equilibria in which the q(r) profile is very flat and q approximately equal 1 in the core region of the plasma. Marginal stability criteria and growth rates are calculated analytically in the large aspect ratio limit and compared with numerical results from the FAR code. The theory is developed for M = n = 1 modes and for higher m(=n) modes. The temperature perturbation due to adiabatic expansion in the linear phase of the 1/1 mode is calculated and compared with experimental data, showing that the prediction from ideal mhd theory cannot account for the observed temperature increase on JET. Comparison with collisionless theory suggests that the observed temperature increase can be accounted for by compression of the trapped particles.

Additional information

Authors: HASTIE R J, CULHAM LABORATORY, ABINGDON (UK);HENDER T C CULHAM LABORATORY, ABINGDON (UK), CULHAM LABORATORY, ABINGDON (UK)
Bibliographic Reference: WRITE TO THE LIBRARIAN, UKAEA, CULHAM LABORATORY, ABINGDON, OXON, OX14 3DB (UK), MENTIONING REPORT CLMP826, 1987
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