RECENT PROGRESS IN LOWER-HYBRID CURRENT DRIVE THEORY AND EXPERIMENTS

In this paper lower hybrid current drive (LHCD) experimental milestone s paving the way for future experiments are briefly summarized. The cu rrent drive efficiency scaling with the electron temperature is discus sed. The role of wave propagation in determining the power deposition profile is stressed and methods are discussed to control the current d ensity profile. Modelling of negative central shear configurations, ex perimentally obtained by LHCD, are reported. A good agreement is found between the modelling results and the experimental findings, thus sho wing that a good degree of understanding has been achieved in LHCD the ory.