Title :
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
fDate :
27 Sept.-1 Oct. 2004
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;
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
DOI :
10.1109/ICIMW.2004.1422054
