TY - JOUR
T1 - Prototype of a Quasi-Optical Launcher System of a 4mm Round-Trip Interferometer for the QUEST Spherical Tokamak Experiments*
AU - Hiroshi Idei, Miu Yunoki
AU - Nakamura, Kazuo
AU - Ryuichi Ashida, Masaharu Fukuyama
AU - Takumi Onchi, Daichi Ogata
AU - Ikezoe, Ryuya
AU - Yoshikawa, Masayuki
N1 - Funding Information:
This work was partially supported by the NIFS13KUDR085.
Publisher Copyright:
© 2019 The Japan Society of Plasma Science and Nuclear Fusion Research
PY - 2019
Y1 - 2019
N2 - 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
AB - 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
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U2 - 10.1585/pfr.14.3402122
DO - 10.1585/pfr.14.3402122
M3 - Article
AN - SCOPUS:85101746916
SN - 1880-6821
VL - 14
SP - 34021221
EP - 34021226
JO - Plasma and Fusion Research
JF - Plasma and Fusion Research
ER -