Optimized antenna system for low power testing of the quasioptical transmission line at TJ-II experiment

In this paper we present a high performance antenna system to carry out low power testing of the main parameters of the quasioptical transmission line system for Electron Cyclotron Resonance Heating (ECRH) at TJ-II experiment under construction in Madrid. The system uses a practically pure Gaussian Beam at 53.2 GHz obtained by means of an optimized corrugated horn launcher. The main goal of the system is to make low power measurements of the beam waveguide by means of a simulation of the gyrotron beam size. Previous experience of both teams in the Millimeter Wave Plasma Heating has been very useful for the design.