RF measurements on the indigenously developed 63.5 MM corrugated waveguide prototype for ITER India Gyrotron Test Facility (IIGTF)

In the electron cyclotron resonance heating (ECRH) system, Gyrotron sources are away from the ports used for power injection to tokamak. As a result, long distance transmission lines with high power capability and very low attenuation are needed to transmit the beams. Corrugated waveguides are widely employed as transmission lines to transmit high-power microwaves for ECRH systems including various other applications viz., plasma diagnostics, radar, materials heating, and dynamic nuclear polarization (DNP) nuclear magnetic resonance (NMR) spectroscopy, etc. ITER-India, the Indian domestic agency for ITER project, has the responsibility to supply a set of two, high power (1MW), long pulse (3600 s) Gyrotron sources at a frequency of 170 GHz to ITER for Electron Cyclotron Heating and Current Drive applications. ITER-India is establishing an ITER-India Gyrotron Test Facility (IIGTF) for testing 1MW class Gyrotrons as per ITER requirements. This paper presents the objective, test set up and test results/observations in detail