Polarizer design for multi-frequency high power ECRH transmission lines

Author

Wagner, D. ; Leuterer, F. ; Gantenbein, G. ; Holzhauer, E. ; Kasparek, W.

Author_Institution

Euratom Assoc., Max-Planck-Inst. fur Plasmaphys., Garching, Germany

fYear

2004

fDate

27 Sept.-1 Oct. 2004

Firstpage

259

Lastpage

260

Abstract

A new broadband ECRH system is currently under construction at the ASDEX Upgrade tokamak. This system employs multi-frequency gyrotrons step-tunable in the range 105-140 GHz. A set of two corrugated polarizer mirrors are applied to provide for an arbitrary polarization of the Gaussian beam injected into the plasma. The principal bandwidth of such a two-polarizer setup has been evaluated. It can be shown that two mirrors with sinusoidal grooves and corrugation depths adjusted to the center frequency of 122.5 GHz satisfy the requirements.

Keywords

Tokamak devices; electromagnetic wave transmission; gyrotrons; optical design techniques; optical polarisers; plasma beam injection heating; plasma electromagnetic wave propagation; plasma radiofrequency heating; 105 to 140 GHz; ASDEX Upgrade tokamak; Gaussian beam; broadband ECRH system; center frequency; corrugated polarizer mirrors; corrugation depths; multifrequency gyrotrons; multifrequency high power ECRH transmission lines; polarizer design; sinusoidal grooves; Gyrotrons; Mirrors; Particle beam injection; Particle beams; Plasmas; Polarization; Power transmission lines; Structural beams; Tokamaks; Variable speed drives;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared and Millimeter Waves, 2004 and 12th International Conference on Terahertz Electronics, 2004. Conference Digest of the 2004 Joint 29th International Conference on

Print_ISBN

0-7803-8490-3

Type

conf

DOI

10.1109/ICIMW.2004.1422054

Filename

1422054