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The Joint European Torus (JET) has conducted extensive experiments in H-mode plasmas focusing on two broad areas. The first, involving the characterization of reactor relevant aspects of the regime, encompasses the study of steady-state H-modes at plasma currents of up to 6 MA. In these plasmas, energy confinement is typically a factor of 1.8-2 greater than predicted by L-mode scalings, and local transport varies with the ion Larmor radius, at least for input powers well above the H-mode threshold power. Using nitrogen impurity seeding, a regime has been developed in which good core confinement, with an enhancement of 1.5 relative to L-mode scaling, is combined with radiated power fractions of up to 80 %. The second area involves optimization of fusion power production by exploiting high confinement ELM-free H-modes, which exhibit energy confinement enhancement factors of 3 or more relative to L-mode plasmas. In this regime, fusion power quotients Q(DT) of about 1 have been achieved, though the highest fusion performance is transient.

Additional information

Authors: CAMPBELL D J ET AL, JET Joint Undertaking, Abingdon, Oxon (GB)
Bibliographic Reference: Report: JET-P(96)42 EN (1996) 10pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
Record Number: 199611509 / Last updated on: 1997-01-16
Original language: en
Available languages: en
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