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ELMy H-mode pulses have been obtained with different hydrogenic isotopes but having the same profiles of the dimensionless parameters p, b, v and q, to test whether the confinement scale invariance principle is valid in a tokamak. The fact that the confinement times, the ELM and sawtooth frequencies in the two pulses all scale as expected suggests that the invariance principle is satisfied through the plasma raidal extent, in spite of the differing physical process taking place in the plasma centre, core and edge regions. An application of this 'isotope windtunnel technique' to predicting D-T performance of next step devices is discussed.

Additional information

Authors: JET JOINT UNDERTAKING, JET Joint Undertaking, Abingdon (GB);ABINGDON (GB), JET Joint Undertaking, Abingdon (GB)
Bibliographic Reference: Report: JET-P(99)41, 6pp.
Availability: Available from the Librarian, JET Joint Undertaking, Abingdon (GB)
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