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Wideband polarizers, switches and waveguide for overmoded corrugated transmission lines.

Authors :
Anderson, James Paul
Doane, John
Grunloh, Howard
Brookman, Michael
Su, David
Source :
Fusion Engineering & Design. Sep2019:Part A, Vol. 146, p46-49. 4p.
Publication Year :
2019

Abstract

Overmoded corrugated waveguide is efficient at transmitting power over a large frequency bandwidth. This operational flexibility becomes important in multi-frequency systems. For 50-mm diameter aluminum corrugated waveguide nominally designed for the ITER 170 GHz ECH system, the theoretical ohmic loss of the HE11mode is around 0.3e-3 dB/m. In a possible dual-frequency system at ITER, the theoretical loss in the same waveguide increases to a manageable 0.8e-3 dB/m at 104 GHz. As examples of other wideband components, General Atomics has built several pairs of 63.5-mm diameter waveguide polarizers for the TCV tokamak's ECH transmission line that are designed to operate for 1 MW at frequencies ranging from 82.6 to 118 GHz. In addition, polarizers have been designed for ITER's 50-mm diameter transmission line. A computer code that calculates both the required mirror rotation angles and the ohmic losses predicts that these polarizers will function effectively at both 170 GHz and 104 GHz. A new class of wideband waveguide switches with rotary actuators have been supplied for the 82.6–126 GHz transmission lines at TCV, further emphasizing the broadband capabilities of corrugated waveguide components. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09203796
Volume :
146
Database :
Academic Search Index
Journal :
Fusion Engineering & Design
Publication Type :
Academic Journal
Accession number :
138152278
Full Text :
https://doi.org/10.1016/j.fusengdes.2018.11.023