UKAEA Papers

"Large-scale numerical simulations of ion beam instabilities in unmagnetized astrophysical plasmas"

• M. E. Dieckmann
• P. Ljung
• A. Ynnerman
• K. G. McClements

Collisionless quasiperpendicular shocks with magnetoacoustic Mach numbers exceeding a certain threshold are known to reflect a fraction of the upstream ion population. These reflected ions drive instabilities which, in a magnetized plasma, can give rise to electron acceleration. In the case of shocks associated with supernova remnants (SNRs), elect…

"Ion Cyclotron Emission from JET D-T Plasmas"

• K. G. McClements
• C. Hunt
• R. O. Dendy
• G. A. Cottrell

Ion cyclotron emission (ICE) excited by collective instability of fusion a particles has been observed during deuterium-tritium experiments with radio-frequency heating and neutral beam injection (NBI) in the Joint European Torus. A model based on classical a-particle confinement is broadly consistent with this data. ICE spectra from discharges wit…

"The influence of fast ions on the magnetohydrodynamic stability of negative shear profiles"

• P. Helander
• C. G. Gimblett
• R. J. Hastie
• K. G. McClements

"Modeling of sawtooth destabilization during radiofrequency heating experiments in tokamak plasmas"

• K. G. McClements
• R. O. Dendy
• R. J. Hastie
• T. J. Martin

"Interpretation of ion cyclotron emission from subAlfvénic fusion products in the Tokamak Fusion Test Reactor"

• K. G. McClements
• R. O. Dendy
• C. N. Lashmoredavies
• G. A. Cottrell
• S. Cauffman
• et al.

Ion cyclotron emission ~ ICE ! has been observed during neutral beam-heated supershots in the Tokamak Fusion Test Reactor ~ TFTR ! @ Phys. Rev. Lett. 72 , 3526 ~ 1994 !# deuterium–tritium campaign at fusion product cyclotron harmonics. The emission originates from the outer midplane edge plasma, where fusion products initially have an anisotropic…

"A model for ideal m=1 internal kink stabilization by minority ion cyclotron resonant heating"

• R. O. Dendy
• R. J. Hastie
• K. G. McClements
• T. J. Martin

A generalized energy principle is used to determine the effect of ion cyclotron resonant heating (lCRH) on the stability of m = 1 intemal kink displacements in the low-frequency limit: such displacements are associated with sawtooth oscillations. An integral expression is obtained for the contribution to the plasma energy of an ICRH-heated minority…