Engineering Aspects of Lower Hybrid Microwave Injection into the Alcator C Tokamak

Abstract

We describe here the RF system currently installed on Alcator C that is being used to inject in excess of 1 MW of net RF power into the tokamak plasma during lower hybrid heating and current drive studies.This system provides for RF power and phase monitoring in each of the individual waveguides of the two 16 waveguide launching arrays, and also for fault protection both at the waveguide arrays and klystrons. Using this system good waveguide-plasna coupling has been obtained and net RF power densities of 9 kW/cm 2 have been injected by the waveguide array without microwave arcing.