Design of matching optics unit (MOU) for coaxial ITER gyrotron

Author

Jin, Jianbo ; Gantenbein, Gerd ; Kern, Stefan ; Rzesnicki, Tomasz ; Thumm, Manfred

Author_Institution

Assoc. EURATOM-KIT, Karlsruhe Inst. of Technol. (KIT), Karlsruhe, Germany

fYear

2011

fDate

21-24 Feb. 2011

Firstpage

271

Lastpage

272

Abstract

The paper presents the design of a MOU for the coaxial ITER gyrotron. Corrugated waveguides are used to transmit the high power mm-waves generated by gyrotrons to the plasma for Electron Cyclotron Resonance Heating (ECRH) and Current Drive (CD). The MOU contains two focusing mirrors, which are used to convert the gyrotron output into a Gaussian distribution with optimal parameters to improve the coupling efficiency of the TEM₀₀ Gaussian distribution to the HE₁₁ mode of the corrugated waveguide. The calculation results reveal that the coupling efficiency of the Gaussian beam to the HE₁₁ mode is approximately 96.33%.

Keywords

Gaussian distribution; fusion reactor ignition; gyrotrons; millimetre wave tubes; mirrors; plasma radiofrequency heating; waveguides; Gaussian beam; Gaussian distribution; HE mode; TEM; coaxial ITER gyrotron; corrugated waveguide; coupling efficiency; current drive; electron cyclotron resonance heating; matching optics unit design; mirror; mm-wave transmission; optimal parameter; plasma; Couplings; Europe; Gyrotrons; Mirrors; Optical waveguides; Particle beams; Transforms; ECRH&CD; Gyrotron; corrugated waveguide; mode conversion; transmission line;

fLanguage

English

Publisher

ieee

Conference_Titel

Vacuum Electronics Conference (IVEC), 2011 IEEE International

Conference_Location

Bangalore

Print_ISBN

978-1-4244-8662-5

Type

conf

DOI

10.1109/IVEC.2011.5746980

Filename

5746980