Experimental observation of interaction of runaway electrons with lower hybrid waves in slide-away regime in the HT-7 tokamak

The characters of slide-away regime in the HT-7 tokamak have been investigated, and evidences that lower hybrid waves (LHW) are excited in slide-away regime are presented based on local fast electron bremsstrahlung (FEB) emission profile and FEB emission spectrum. The interaction of high energy runaway electrons with those excited LHW via anomalous Doppler resonance is analyzed and the resonance energy is derived with which the behavior of those relevant signals in the experiment can be explained very well. It is shown that this interaction can provide an effective way to reduce the damage to the machine caused by runaway electrons.