Neo-classical tearing modes have been identified in JET ELMy H-mode discharges at medium to high beta. The n=2 modes as observed in both ECE and SXR data, have a clear island structure and a global character. The critical normalised beta at the onset of the modes is found to scale

Recent experience with the use of tritium fuel in the Tokamak Fusion Test Reactor and the Joint European Torus, together with progress in developing the technical design of the International Thermonuclear Experimental Reactor has expanded the technical knowledge base for tritium issues in fusion

No. DE-AC02-78ET51013. Reproduction, translation, publication, use

divertor geometry and chemical sputtering

JET has recently operated with deuterium-tritium (D-T) mixtures, carried out an ITER physics campaign in hydrogen, deuterium, D-T and tritium, installed the Mark ␣ IIGB ÒGas BoxÓ divertor fully by remote handling and started physics experiments with this more closed divertor. The D-T experiments

Recent progress in the study of divertor and scrape-off layer plasma (SOL) phenomena in JET is reviewed. Up to the present time, three pumped divertors (Mark I, Mark IIA/AP and Mark IIGB) have been installed and exploited under reactor relevant conditions. With increased divertor closure

gain Q than in conventional sawtoothing steady-state ELMy H-mode plasmas. Steady-state conditions in temperature and density profiles have been approached in Double Barrier discharges in deuterium. The Double Barrier mode has been routinely estab-lished in the new Gas Box divertor configuration on JET

(Work done partly in the framework of the JET Joint Undertaking)

Abstract. As the reference operating regime for ITER, investigations of the ELMy H-mode have received high priority in the JET experimental programme. Recent experiments have concentrated in particular on operation simultaneously at high density and high confinement using high field side (HFS

“This document is intended for publication in the open literature. It is made available on the understanding that it may not be further circulated and extracts may not be published prior to publication of the original, without the consent of the Publications Officer, JET Joint Undertaking, Abingdon