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Joint European Torus (JET) experimental results directly relevant to the international thermonuclear experimental reactor (ITER) design are presented. From recent experiments in deuterium-tritium (DT) mixtures varying from 100:0 to 10:90, it is inferred that an inverse mass dependence should be included in the H-mode power threshold scaling. Using ITER similarity experiments, the global energy confinement time in JET discharges with type I edge-localized modes (ELM) is found to be consistent with the gyro-Bohm physics form which has no dependence on plasma beta. This form has a weak negative mass dependence but a stronger density dependence than the ITERH93-P scaling. Using the JET MkIIa pumped divertor with N(2) seeding, ITER-relevant highly radiative regimes accompanied by type III ELMs have been studied. It is found that the confinement degrades progressively with increasing radiative power fraction. Power loading of divertor tiles with type I ELMs appears to be excessive with neutral beam injection (NBI) whereas it is less of a concern with interrupted current rise heating (ICRH). Preliminary assessement of the ITER reference second harmonic ICRH scenario with and without the addition of a small amount of He3 is also presented. High performance optimized shear discharges with potentially well aligned bootstrap current scenarios consistent with ITER-relevant steady-state operation have also been studied. Internal transport barriers featuring peaked plasma profiles have been demonstrated in DT plasmas in JET.

Additional information

Authors: THOMAS P R, JET Joint Undertaking, Abingdon, Oxon (GB);BHATNAGAR V P, JET Joint Undertaking, Abingdon, Oxon (GB)
Bibliographic Reference: Report: JET-P(97)52 EN (1997) 21pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
Record Number: 199810248 / Last updated on: 1998-03-09
Original language: en
Available languages: en