JET recent results on wave heating and current drive : Consequences for future devicesFunded under: FP2-FUSION 10C
The latest developments of the JET ICRH and LHCD systems are reviewed. Feedback controls have alleviated the traditional difficulties with plasma-antenna coupling. Experimental results on high plasma performance, basic confinement aspects and issues relevant to the next generation of tokamaks are described. ICRH allows a narrow power deposition profile to be localised at will, independently of the plasma density and size. It is demonstrated that, in large tokamaks, the constraint of using a minority species can be removed and heating a balanced D/T mixture at omega = omega(CD) in ITER is proposed. LHCD allows the highest current drive efficiency to be obtained. The conditions for wave accessibility are discussed in the light of the JET results. LHCD is well adapted to save volt seconds in the current rise phase. The observed synergistic LHCD/ICRH acceleration of fast electrons is a promising route towards higher current drive efficiency but raises unresolved physics aspects which are analysed. Finally, the prospects for a steady fusion reactor are considered.
Bibliographic Reference: Report: JET-P(92)77 EN (1992) 17 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199211583 / Last updated on: 1994-11-29
Original language: en
Available languages: en