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The properties of JET plasmas obtained in similar conditions, but using different ion species, are compared. In hydrogenic limiter discharges with NBI heating, particle confinement and sawtooth activity display a strong isotopic dependence. However, the improvement in global energy confinement from hydrogen to deuterium is only approximately 20 %, not consistent with the square-root dependence of tau(E) on A(i) often found in L-mode scaling relationships. No significant change in energy or particle confinement is observed when deuterium is replaced by helium-3.

Additional information

Authors: TIBONE F ET AL., JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(92)79 EN (1992) 14 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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