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Two H-mode regimes have been identified in JET in which edge localised modes (ELMs) maintain steady-state conditions. In the first regime, strong gas puffing was used in combined (ICRF plus NBI) heating experiments at powers of up to 20 MW. Rapid ELM activity occurred and, at moderate powers, steady-state H-modes with durations of up to 18 s and energy confinement times of up to 95 % of the JET/D-IIID scaling were establised. At high toroidal beta, H-mode plasmas were also found to exhibit regular ELM behaviour, which resulted in steady-state H-modes with confinement enhancement of about 90 % of the JET/D-IIID scaling. This paper examines the plasma properties of these regimes and assesses their implications for steady-state H-mode operation in ignited plasmas.

Additional information

Authors: CAMPBELL D J, JET Joint Undertaking, Abingdon, Oxon. (GB);ALI-ARSHAD S, JET Joint Undertaking, Abingdon, Oxon. (GB);GONDHALEKAR A, JET Joint Undertaking, Abingdon, Oxon. (GB);THOMAS P R, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(94)01 EN (1994) 6 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199410328 / Last updated on: 1994-11-28
Original language: en
Available languages: en
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