Abstract / Description of output
This paper reports on results of theoretical studies dealing with: (1)
the use of microinstability-based thermal transport models to interpret the
anomalous confinement properties observed in key tokamak experiments such as
TFTR and (2) the likely consequences of the presence of such instabilities for
future ignition devices. Transport code simulations using profile-consistent
forms of anomalous thermal diffusivities due to drift-type instabilities have
yielded good agreement with the confinement times and temperatures observed in
TFTR under a large variety of operating conditions including pellet-fuelling
in both ohmic-and neutral-beam-heated discharges. With regard to achieving an
optimal ignition margin, the adverse temperature scaling of anomalous losses
caused by drift modes leads to the conclusion that it is best to operate at
the maximum allowable density while holding the temperature close to the
minimum value required for ignition.
Original language | English |
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Title of host publication | Proceedings 11th European Conference on Plasma Physics and Controlled Fusion Research, Kyoto |
Number of pages | 15 |
Volume | 1 |
Publication status | Published - 1 Jan 1986 |