Prototype of a Quasi-Optical Launcher System of a 4mm Round-Trip Interferometer for the QUEST Spherical Tokamak Experiments*

Miu Yunoki Hiroshi Idei, Kazuo Nakamura, Masaharu Fukuyama Ryuichi Ashida, Daichi Ogata Takumi Onchi, Ryuya Ikezoe, Masayuki Yoshikawa

Research output: Contribution to journalArticlepeer-review

Abstract

A launcher system for a round-trip interferometer, with a corrugated horn antenna and two quasi-optical mirrors, has been developed for the QUEST spherical tokamak experiment. The corrugated horn antenna has been designed using a three-dimensional (3D) electromagnetic simulator. At low power bench test, intensity and phase profiles at 0.1m from antenna aperture show coaxial patterns as predicted by the 3D simulator, in agreement with the calculation results using an in-house developed Kirchhoff integral code. The designed waistsizes of the focused beam at a target position are 22mm in the horizontal x direction and 43mm in the vertical y direction. The beam reaches the target plate at QUEST’s center-post and is reflected back along the line-of-sight round-trip. A well-focused beam of 32 and 36mm in size (x, y) has been obtained at the target position. The HE11 mode excitation, beam transmission, and focusing properties are discussed for the prototype launcher system

Original languageEnglish
Pages (from-to)34021221-34021226
Number of pages6
JournalPlasma and Fusion Research
Volume14
DOIs
Publication statusPublished - 2019

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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