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Abstract

During JET's first three years of operation, experiments have been undertaken with up to about 7MW of ICRF, about 10 MW of neutral beam and about 18 MW of total input power during combined operation. The latest JET results show many advances made during this period. In particular, the especially good confinement (TE up to 0.8s), high temperatures (T-e up to 5keV) and fusion product <niTETi> - 10**20m**-3.s.keV achieved with ohmic heating alone have exceeded expectations. Also, very efficient ion heating has been observed (Ti>12.5+-1.5keV) at moderate neutral beam injection power levels (P-NB<or=8MW) and at low average densities (n-e about 1-1.5 x 10**19m**-3). In addition, a fusion product <niT-E> = 2x10**20m**- 3-s.k.eV has been achieved with separatrix configuration in JET. However limitations have been encountered in plasma density and electron and ion temperatures due to disruptions and sawtooth oscillations. With additional heating, confinement is degraded, as the electron temperature outside the sawtooth region exhibits only a weak dependence on the input power per particle. As a consequence, additional heating has little impact on the fusion product. The consequent developments to provide significant alpha - heating in JET are described.

Additional information

Authors: JET TEAM, JET JOINT UNDERTAKING, ABINGDON (UK);REBUT P H JET JOINT UNDERTAKING, ABINGDON (UK), JET JOINT UNDERTAKING, ABINGDON (UK)
Bibliographic Reference: 11TH INTERNATIONAL CONFERENCE ON PLASMA PHYSICS AND CONTROLLED NUCLEAR FUSION RESEARCH, KYOTO (JAPAN), NOV. 13-20, 1986 WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON OX14 3EA (UK), MENTIONING REPORT JET-P(86)44, 1986
Record Number: 1989125076500 / Last updated on: 1987-12-01
Category: PUBLICATION
Available languages: en