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Abstract

In the laboratory frame, the helical path followed by an ion contained in a rotating toroidal plasma is rd determined to leading order by three factors: its velocity v-3S parallel to the magnetic field, the q-factor of the flux surface on which the ion travels, and the velocity of bulk toroidal rotation V-R(q) of the flux surface itself. A parameter q(q,V-R(q),v-3S) is calculated, which determines whether the helical path in the laboratory frame is closed (rational-q) or open (irrational-q). In general the spatially localised region where ion heating takes place is fixed in the laboratory frame. Those ions which have rational-q paths that pass through the heating region are subject, by frequent repetition, to greatly enhanced heating. The associated fine structure in the spatial and velocity space energy deposition is examined.

Additional information

Authors: DENDY R O CULHAM LABORATORY, ABINGDON (UK), CULHAM LABORATORY, ABINGDON (UK)
Bibliographic Reference: WRITE TO THE LIBRARIAN, UKAEA, CULHAM LABORATORY, ABINGDON, OXON, OX14 3DB (UK), MENTIONING REPORT CLM-P814, 1987
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