Measurement of RF Transmission Mode in ITER Relevant EC H&CD Transmission Line

The preliminary results of mode measurement in the ITER relevant 40 m long transmission test line composed from 63.5 mm diameter corrugated waveguides and miter bends are presented. The field patterns were measured by taking temperature profiles on a paper screen placed in front of the waveguide end...

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Bibliographic Details
Published in:Journal of Infrared, Millimeter, and Terahertz Waves Millimeter, and Terahertz Waves, 2010-08, Vol.31 (8), p.949-957
Main Authors: Oda, Yasuhisa, Kajiwara, Ken, Takahashi, Koji, Kasugai, Atsushi, Shapiro, Michael A., Temkin, Richard J., Sakamoto, Keishi
Format: Article
Language:English
Subjects:
Bends
Cameras
Classical Electrodynamics
Corrugated waveguides
Dependence
Electric fields
Electrical Engineering
Electronics and Microelectronics
Engineering
Infrared
Infrared cameras
Infrared imaging
Instrumentation
Launchers
Radio frequencies
Temperature profiles
Transmission lines
Waveguides
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Summary:The preliminary results of mode measurement in the ITER relevant 40 m long transmission test line composed from 63.5 mm diameter corrugated waveguides and miter bends are presented. The field patterns were measured by taking temperature profiles on a paper screen placed in front of the waveguide end using an infrared imaging camera. The complex electric field at the waveguide end was retrieved from the measured temperature profiles. As a result, the transmission power includes 87% of HE 11 mode and 6% of LP 11 odd (HE 21 +TE 01 ) mode and small ratios of other modes. The mode content had small dependence on length of the transmission line. This result indicated that the higher order mode content generated at the input of the transmission line is conserved and propagated through the transmission line. This suggests that the initial RF coupling to the waveguide is critical since it affects the launcher efficiency.
ISSN:1866-6892
1572-9559
1866-6906
DOI:10.1007/s10762-010-9666-4