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Institute for Plasma Research, Bhat, Gandhinagar 382 428, India
Abstract. Some self-consistent effects pertaining to feedback control of
neoclassical tearing modes in high temperature large tokamaks are
investigated. For the ECRH scheme of local electron heating, it is shown that
the self-consistent bootstrap currents created by the driven pressure
gradients within the island are comparable to those due to the usually
considered resistivity change mechanism. Similar self-consistent currents can
also arise from pressure gradients created by density and energy deposition
from neutral beams, thereby offering a new possibility of neoclassical mode
control. The stabilising current in such an application of neutral beams is
estimated. It is further shown that such a feedback scheme can be made even
more effective through appropriate modulation of the beam source to match the
phase variation arising from the island rotation.
IAEA 2001
