Response of lower hybrid wave driven current profile on wave launching position

The impact of launching poloidal position on the lower hybrid wave (LHW) driven current profile was investigated on the JT-60U tokamak. By comparing LHW launching from different poloidal positions, at poloidal angles θ of 0 and 45° from the equatorial plane, it was found that when LHWs were injected from θ ≃ 45° the spatial profile of high energy electrons produced by the LHWs appears as if LHWs of slower phase velocity were injected from θ ≃ 0°. The experimental results are compared with ray tracing calculations