UKAEA Papers

"Alfvén wave cascades in a tokamak"

• S. E. Sharapov
• B. Alper
• H. L. Berk
• D. N. Borba
• B. N. Breizman
• et al.

Experiments designed for generating internal transport barriers in the plasmas of the Joint European Torus [JET, P. H. Rebut et al. , Proceedings of the 10th International Conference, Plasma Physics and Controlled Nuclear Fusion, London ~ International Atomic Energy Agency, Vienna, (1985), Vol. I, p. 11 ] reveal cascades of Alfven perturbations wit…

"Nonlinear magnetohydrodynamical effects in precessional fishbone oscillations"

• A. Ödblom
• B. N. Breizman
• S. E. Sharapov
• T. C. Hender
• V. P. Pastukhov

"Theoretical Interpretation of Alfvén Cascades in Tokamaks with Nonmonotonic q Profiles"

• H. L. Berk
• D. N. Borba
• B. N. Breizman
• S. D. Pinches
• S. E. Sharapov

Alfvén spectra in a reversed-shear tokamak plasma with a population of energetic ions exhibit a quasiperiodic pattern of primarily upward frequency sweeping (Alfvén cascade). Presented here is an explanation for such asymmetric sweeping behavior which involves finding a new energetic particle mode localized around the point of zero magnetic shear…

"Modeling of diamagnetic stabilization of ideal magnetohydrodynamic instabilities associated with the transport barrier"

• G. T. A. Huysmans
• S. E. Sharapov
• A. B. Mikhailovskii
• W. Kerner

"RF-induced pinch of resonant 3He minority ions in JET"

• T. Johnson
• T. Hellsten
• M. Mantsinen
• V. Kiptily
• S. Sharapov
• et al.

The RF-induced pinch of 3 He minority ions has been observed in JET affecting the diamagnetic energy, the fast ion energy content, the sawtooth period, the Alfvén eigenmode excitation and the y-emission. Further, the y-emission is consistent with RF-detrapping into co-current passing orbits. The results from the SELFO code are consistent with the …