Abstract
We design a quasi-optical transmission line system for a 400 GHz gyrotron beam. The 400GHz Gaussian beam is injected to a corrugated waveguide bounced from a quasi-optical mirror. From detailed 2D field patterns of the output beam emitted from the corrugated waveguide, we analyze the mode contents and the source of non-ideal beam expansion
Highlights
In sub-terahertz (THz) range, development of high power transmission lines is faced with problems such as manufacturing tolerance and coupling efficiency
We show the gyrotron output Gaussian beam coupling through a quasi-optical transmission line and measurement of 2D field patterns coming out the corrugated waveguide
Based on the beam waist location of the Gaussian beam antenna, the quasi-optical mirror and corrugated waveguide is designed by Surf3D simulation code [2]
Summary
In sub-terahertz (THz) range, development of high power transmission lines is faced with problems such as manufacturing tolerance and coupling efficiency. For preparation of KDEMO, a proceeding research is required to transfer ECH beam to tokamak with low loss at sub-THz frequency. A typical case is a Gaussian beam coupling from a gyrotron ouput to a corrugated waveguide. A HE11 mode in the corrugated waveguide can reduce an Ohmic loss, and the coupling of Gaussian beam coming from gyrotron to the HE11 mode is important [1]. We show the gyrotron output Gaussian beam coupling through a quasi-optical transmission line and measurement of 2D field patterns coming out the corrugated waveguide
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