Design analysis of test bed with variable VSWR and variable phase angle for frequency range of 35 to 65 MHz

The ion cyclotron resonance frequency (ICRF) system is one of the most important ITER heating and current drive systems. Total 20 MW of RF power is required to be dumped on the ITER plasma using 8 nos. of RF sources, each capable of delivering 2.5 MW at VSWR 2 in the frequency range 35 - 65 MHz. RF power to the antenna should remain constant to its required value, even if source experiences VSWR of 2 at any phase angle. To qualify the RF sources without antenna, a test bed is to be fabricated to simulate antenna condition for the entire frequency band. The design analysis for the test bed has been done using RFSim99 software which consists of two phase shifters, one stub tuner and one matched 50 ohm dummy load. This paper describes the technical aspect of the design of this test bed.