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Abstract

During interrupted continuous radio frequency (ICRF) heating experiments on the Joint European Torus (JET) new 4-strap antennas have coupled 16.5 MW of power into single null divertor plasmas. In combined heating experiments a maximum of 32 MW has been achieved by adding 15 MW of hydrogen minority interrupted current rise heating (ICRH) to 17 MW of neutral beam injection (NBI). Central electron temperatures close to 15 keV have been obtained with both radio frequency (RF) only and combined heating in edge localized mode free plasmas. RF only H-modes have been produced in plasmas with currents (I(p)) up to 4.7 MA and the power thresholds are similar to those with NBI. At I(p) = 4.7 MA and a toroidal field (B(t)) of 3.2 T, a plasma energy content of 7 MJ was achieved with 8 MW of 51.3 MHz ICRH in Opi Opi phasing. The heating efficiency is close to 100% with Opi Opi and OpipiO phasing, but decreases for phasings such as OOpipi and monopole. However, the recent introduction of a separator limiter at the centre of one antenna has improved its heating efficiency for perpendicularly launched waves.

Additional information

Authors: START D F H, JET Joint Undertaking, Abingdon, Oxon (GB)
Bibliographic Reference: Report: JET-P(95)33 EN (1995) 8pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
Record Number: 199610166 / Last updated on: 1996-03-01
Category: PUBLICATION
Original language: en
Available languages: en