Runaway Electrons and Plasma Turbulence in Current Ramping by Lower Hybrid Waves in Tokamak Plasmas

摘要

The role of runaway electrons in current ramping by lower hybrid waves is discussed. The back emf induced by current ramping using lower hybrid waves produces runaway electrons at such a rate that the rate of change of the current carried by runaways can completely compensate the rf current ramp rate if runaways are well-confined. However, runaway electrons can also destabilize the oblique plasma waves due to their anisotropy. The resulting turbulence can greatly reduce the run-away production rate, enabling the current ramping rate to exceed the above limit. (ERA citation 10:026461)