Title :
Gyrotron beam coupling method into corrugated waveguide
Author :
Oda, Yasuhisa ; Kajiwara, Ken ; Takahashi, Koji ; Kasugai, Atsushi ; Sakamoto, Keishi
Author_Institution :
Japan Atomic Energy Agency, Naka, Japan
Abstract :
A coupling method of a gyrotron beam into a corrugated waveguide is proposed to achieve high HE11 mode purity in ITER´s ECH&CD transmission line. A matching optical unit (MOU) with two phase correcting mirrors is used. Each mirror is mounted on a goniometer stage for angle control. The mode content in the waveguide is measured for several sets of mirror angles to maximize the mode purity. The mode content is deduced using RF field profiles radiated from the waveguide outlet. A demonstrative procedure of the beam coupling achieved 93% of HE11 mode in the transmission power.
Keywords :
goniometers; gyrotrons; transmission lines; waveguides; HE11 mode purity; RF field profiles; angle control; corrugated waveguide; goniometer stage; gyrotron beam coupling method; matching optical unit; mode content; phase correcting mirrors; transmission line; Goniometers; Gyrotrons; Mirrors; Optical beams; Optical coupling; Optical waveguides; Power transmission lines; Radio frequency; Temperature measurement; Transmission line measurements;
Conference_Titel :
Infrared, Millimeter, and Terahertz Waves, 2009. IRMMW-THz 2009. 34th International Conference on
Conference_Location :
Busan
Print_ISBN :
978-1-4244-5416-7
Electronic_ISBN :
978-1-4244-5417-4
DOI :
10.1109/ICIMW.2009.5325674
