Title :
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
Abstract :
A 2 MW, CW, 170 GHz, TE34,19 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; TE34,19 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;
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.2009.5324629
