Ohm's law and the value of beta in tokamaks with non-inductive current drive
The profile constraint resulting from Ohm's law is used to derive a relationship between the normalised energy content (poloidal or toroidal beta) and the normalised current (1/q) for tokamak discharges. Previous work on this subject, within the framework of the extended neoclassical theory, is extended to include the effect of non-inductive current drive. It is found that the latter, in addition to the plasma refuelling, has a significant influence on the plasma thermal content, although the energy balance is not considered. Agreement is found with available NB injection experiments. The suggestion made previously, that energy confinement may depend more on momentum balance than on thermal transport, is given further support.
Bibliographic Reference: Report: RT/NUCL/92/25 EN (1992) 27 pp.
Availability: Available from Servizio Studi e Documentazione, ENEA, Centro Ricerche Energia Frascati, C.P. 65-00044 Frascati, Roma (IT)
Record Number: 199310612 / Last updated on: 1994-11-29
Original language: en
Available languages: en