Lower hybrid launchers on JETFunded under: FP3-FUSION 11C
Lower hybrid current drive (LHCD) experiments were performed in JET in a first stage with one third of the final LHCD system. Good coupling with reflection coefficients as low as 1 % and a power density of about 4 kW/cm2 on the plasma interface were obtained with the prototype launcher. The complete LHCD system with a total power of 12 MW (20 s) in the generator starts operation with the JET divertor experiments in early 1994. The full launcher contains an array of 384 waveguides, built up from 48 multijunctions with internal power splitting. Three different LH wave spectra can be radiated simultaneously into the plasma, applying different phase settings to the three independent sections of the grill type antenna. Testbed experiments use a hyperguide to connect an array of standard size waveguides to the plasma facing antenna structure, which forms the slow wave LH spectrum.
Bibliographic Reference: Report: JET-P(93)108 EN (1993) 18 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199410320 / Last updated on: 1994-11-28
Original language: en
Available languages: en