On the role of different phasings of the ICRF antennas in optimised shear discharges in JET
In discharges with internal transport barriers produced by combined neutral beam injection and ion cyclotron resonance frequency (ICRF) heating using the hydrogen minority scheme in JET, the confinement and fusion performance are strongly affected by the direction of propagation of the ICRF waves. When the waves propagate along the plasma current, the formation of an internal transport barrier is prompter and the neutron yield is up to a factor if two higher than for propagation against the current. An ICRF induced pinch of resonating trapped ions is put forward as a candidate for explaining the observations. Simulation results are presented which show that this effect is strong enough to provide a credible explanation for the experimental results.
Bibliographic Reference: Report: JET-P(99)66
Availability: Available from JET Joint Undertaking, Abingdon, Oxfordshire (GB)
Record Number: 200012770 / Last updated on: 2000-09-20
Original language: en
Available languages: en