1. Near-Field Physics of Lower-Hybrid Wave Coupling to Long-Pulse, High Temperature Plasmas in Tore Supra
A dynamic Stark effect measurement performed near a LHCD antenna on Tore Supra
Experimental Db spectral line profile fits the theoretical profile with a radial polarization of the RF electric field, consistently with LH propagation
Amplitude of the RF field is consistent with low Te at the LHCD antenna (~4eV) => Db emission probability peaks ~6.5cm away from the antenna
ne0=1.5
ne0=2
ne0=3
P1/2
Ln=2mm Ln=1.5mm
(1017m-3)
Large data base (~230 points) indicate that ERF scales as expected (Pcoupled1/2) assuming edge density is close to the cut-off density (~2×1017m-3)
When the most outer waveguides are switched off, the measured electric field does not vary significantly as the rays avade the emission region