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A 1.5MW ion cyclotron resonance heating (ICRH) system is being developed as an auxiliary heating system for steady state super-conducting tokamak-1 (SST-1) plasma. Different frequencies between 20 and 91.2MHz have been selected to allow second harmonic and minority heating at 1.5 and 3.0T toroidal magnetic fields. Various stages of amplifiers will be used to achieve the targeted power output at the...