Quasi-optical polarizer system for ECHCD experiments in the QUEST

M. Fukuyama, Hiroshi Idei, T. I. Tsujimura, S. Kubo, S. Kobayashi, M. Yunoki, Takumi Onchi, Ryuya Ikezoe

Research output: Contribution to journalArticle

Abstract

A new transmission line from 28 GHz gyrotron to QUEST spherical tokamak (ST) has been developed for the highly efficient electron cyclotron heating and current drive (ECHCD) experiments. The ECHCD effect depends on the incident mode or polarization states of the injected beam. Although two corrugated-polarizer miter bends were developed and assembled to transmission line in the QUEST, arcing events were frequently detected at the polarizer miter bend when the high-power millimeter-wave were transmitted. A new quasi-optical (QO) concept for the polarizer system composed of two corrugated plate and a QO mirror was proposed to avoid the arcing at polarizer. The QO mirror was designed for coupling of input and output HE11 modes at the polarizer, its coupling property is discussed with Kirchhoff integral. Polarization-setting performance of the developed QO polarizer was examined in a low-power test system, and is discussed with grating-polarizer calculation.

Original languageEnglish
Pages (from-to)1437-1440
Number of pages4
JournalFusion Engineering and Design
Volume146
DOIs
Publication statusPublished - Sep 1 2019

Fingerprint

Cyclotrons
Optical systems
Electric lines
Mirrors
Polarization
Heating
Electrons
Millimeter waves
Experiments

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Quasi-optical polarizer system for ECHCD experiments in the QUEST. / Fukuyama, M.; Idei, Hiroshi; Tsujimura, T. I.; Kubo, S.; Kobayashi, S.; Yunoki, M.; Onchi, Takumi; Ikezoe, Ryuya.

In: Fusion Engineering and Design, Vol. 146, 01.09.2019, p. 1437-1440.

Research output: Contribution to journalArticle

Fukuyama, M. ; Idei, Hiroshi ; Tsujimura, T. I. ; Kubo, S. ; Kobayashi, S. ; Yunoki, M. ; Onchi, Takumi ; Ikezoe, Ryuya. / Quasi-optical polarizer system for ECHCD experiments in the QUEST. In: Fusion Engineering and Design. 2019 ; Vol. 146. pp. 1437-1440.
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