TY - GEN
T1 - Stability of ion temperature gradient driven modes in the presence of a magnetic island in tokamaks
AU - Wilson, H. R.
AU - Applegate, D. J.
AU - Connor, J. W.
PY - 2007
Y1 - 2007
N2 - The stability of ion temperature gradient driven modes in a sheared slab model of a tokamak plasma containing a chain of narrow magnetic islands is presented. The modification to the pressure and flow profiles in the vicinity of the islands is evaluated self-consistently taking account of the different responses of the electrons and ions to the electromagnetic field. Small amplitude, time-dependent perturbations about this equilibrium are described by linearised gyro-kinetic equations. It is found that the magnetic islands provide a significant stabilising effect on the instability, as well as localising the mode in the vicinity of the island X-point. This would be expected to suppress transport in the vicinity of the rational surface about which the island chain is centred, although there could be a (reduced) remnant electron heat transport that remains, driven by the magnetic islands. This theory may be of relevance for triggering internal transport barriers and NTM threshold physics.
AB - The stability of ion temperature gradient driven modes in a sheared slab model of a tokamak plasma containing a chain of narrow magnetic islands is presented. The modification to the pressure and flow profiles in the vicinity of the islands is evaluated self-consistently taking account of the different responses of the electrons and ions to the electromagnetic field. Small amplitude, time-dependent perturbations about this equilibrium are described by linearised gyro-kinetic equations. It is found that the magnetic islands provide a significant stabilising effect on the instability, as well as localising the mode in the vicinity of the island X-point. This would be expected to suppress transport in the vicinity of the rational surface about which the island chain is centred, although there could be a (reduced) remnant electron heat transport that remains, driven by the magnetic islands. This theory may be of relevance for triggering internal transport barriers and NTM threshold physics.
UR - http://www.scopus.com/inward/record.url?scp=84873867319&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84873867319
SN - 9781622763344
T3 - 34th EPS Conference on Plasma Physics 2007, EPS 2007 - Europhysics Conference Abstracts
SP - 2226
EP - 2229
BT - 34th EPS Conference on Plasma Physics 2007, EPS 2007 - Europhysics Conference Abstracts
T2 - 34th European Physical Society Conference on Plasma Physics 2007, EPS 2007
Y2 - 2 July 2007 through 6 July 2007
ER -