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Abstract

High performance discharges with optimized magnetic shear having a broad or hollow current density profile have been produced in JET. These plasmas are characterized by improved core confinement within a region called the Internal Transport Barrier. Near the plasma centre, the ion thermal diffusivity is reduced to levels close to the standard neo-classical level in both D-D and D-T plasmas. With D-D fuel, a JET record neutron yield was produced and, with D-T fuel, L-mode discharges with 7.2 MW of fusion power, and H-mode discharges with up to 8.2MW of fusion power are obtained. Central ion temperatures approaching 40 KeV, ion temperature gradients of 150 KeVm(-1) and plasma pressure gradients of 10(6)Pa m(-1) are observed in D-T leading to a fusion triple product. Central toroidal rotation frequencies up to 37 kHz are observed and rotational flow near the radius of the ITB is strongly sheared.

Additional information

Authors: COTTRELL G A, JET Joint Undertaking, Abingdon (GB);BARANOV Y F, JET Joint Undertaking, Abingdon (GB);CHALLIS C D, JET Joint Undertaking, Abingdon (GB);GORMEZANO C, JET Joint Undertaking, Abingdon (GB);EKEDAHL A, JET Joint Undertaking, Abingdon (GB);HUYSMANS G T A, JET Joint Undertaking, Abingdon (GB);LITUADON X, JET Joint Undertaking, Abingdon (GB);BRIEN D O, JET Joint Undertaking, Abingdon (GB);ROCHARD F, JET Joint Undertaking, Abingdon (GB);SADLER G J, JET Joint Undertaking, Abingdon (GB);SCHILD P, JET Joint Undertaking, Abingdon (GB);SIPS A C C, JET Joint Undertaking, Abingdon (GB);SOLDNER F X, JET Joint Undertaking, Abingdon (GB);TUBBING B J, JET Joint Undertaking, Abingdon (GB);WARD D J, JET Joint Undertaking, Abingdon (GB);ZWINGMANN W P, JET Joint Undertaking, Abingdon (GB)
Bibliographic Reference: Article: JET-P(98)68
Record Number: 199910831 / Last updated on: 1999-06-11
Category: PUBLICATION
Original language: en
Available languages: en
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