JET : Progress in performance and understandingFunded under: FP2-FUSION 10C
In 1990 JET operated with a number of technical improvements which led to advances in performance and permitted the carrying out of experiments specifically aimed at improving the physics understanding of selected topics relevant to Next Step devices. The new facilities include beryllium antenna screens, a prototype lower hybrid current drive system, and modification of the NI system to enable the injection of 3He and 4He. Progress towards steady state operation has been made by achieving ELMy H-modes under certain operating conditions, while maintaining good tau(E) values. Experimental simulation of He ash transport indicates effective removal of alpha-particles from the plasma core for both L and H mode plasmas. Detailed analyses have helped establish a firmer link between particle and energy transport, and have suggested a connection between reduced energy transport and reversed shear. Numerical and analytic studies of divertor physics carried out for the pumped divertor phase of JET have helped clarify the key parameters governing impurity retention, and an intensive model validation effort has begun.
Bibliographic Reference: Report: JET-P(91)30 EN (1991) 25 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199111626 / Last updated on: 1994-12-02
Original language: en
Available languages: en