Highly efficient quasi-optical mode converter for coaxial ITER gyrotron at FZK

Author

Jin, J. ; Thumm, M. ; Piosczyk, B. ; Kern, S. ; Li, G. ; Rzesnicki, T.

Author_Institution

Inst. fur Hochleistungsimpuls- und Mikrowellentech. (IHM), Forschungszentrum Karlsruhe, Karlsruhe, Germany

fYear

2009

fDate

21-25 Sept. 2009

Firstpage

1

Lastpage

2

Abstract

A 2 MW, CW, 170 GHz, TE_34,19 mode coaxial-cavity gyrotron for electron cyclotron heating and current drive in ITER is under development in cooperation between European Research Institutions (EGYC*). A new method has been used to design a highly efficient quasi-optical (q.o.) mode converter for this gyrotron to transform the cavity mode into a fundamental Gaussian beam. The simulation results and low power measurements reveal that the fundamental Gaussian mode content can be enhanced to 97.7% at the output window plane.

Keywords

Tokamak devices; convertors; drives; gyrotrons; plasma confinement; plasma diagnostics; plasma radiofrequency heating; plasma simulation; European Research Institution; FZK; TE_34,19 mode coaxial-cavity gyrotron; cavity mode; coaxial ITER gyrotron; current drive; electron cyclotron heating; frequency 170 GHz; fundamental Gaussian beam; low power measurement; power 2 MW; quasioptical mode converter; Coaxial components; Cyclotrons; Electrons; Gyrotrons; Heating; Power measurement;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ICIMW.2009.5324629

Filename

5324629