Integral staggered point-matching method for millimeter-wave reflective diffraction gratings on electron cyclotron heating systems

• The integral staggered point-matching method for design of polarizers on the ECH systems is presented.
• The availability of the integral staggered point-matching method is checked by numerical calculations.
• Two polarizers are designed with the integral staggered point-matching method and the experimental results are given.

The reflective diffraction gratings are widely used in the high power electron cyclotron heating systems for polarization strategy. This paper presents a method which we call “the integral staggered point-matching method” for design of reflective diffraction gratings. This method is based on the integral point-matching method. However, it effectively removes the convergence problems and tedious calculations of the integral point-matching method, making it easier to be used for a beginner. A code is developed based on this method. The calculation results of the integral staggered point-matching method are compared with the integral point-matching method, the coordinate transformation method and the low power measurement results. It indicates that the integral staggered point-matching method can be used as an optional method for the design of reflective diffraction gratings in electron cyclotron heating systems.