ICRH Antenna Array Analysis and Resulting Problem of Generator Matching

A model for arrays of ion cyclotron resonance heating (ICRH) antennae is presented, each antenna being fed by a separate generator with its own tuning system. In view of wave spectrum shaping, arbitrary phasing is introduced between the generators. The array is analyzed in quasi-TEM modes, and its equivalent impedance matrix is derived. In the case of an antenna pair, we study the matching of both generators, which becomes quite involved due to the strong coupling between antennae, and we investigate the consequences of tuning errors on the whole system.