Measurement of RF Transmission Mode in ITER Relevant EC H&;CD Transmission Line |
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Authors: | Yasuhisa Oda Ken Kajiwara Koji Takahashi Atsushi Kasugai Michael A Shapiro Richard J Temkin Keishi Sakamoto |
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Affiliation: | (1) Plasma Heating Research Group, Japan Atomic Energy Agency, Naka Fusion Research Institute, 801-1 Mukoyama, Naka, Japan;(2) Plasma Science and Fusion Center, Massachusetts Institute of Technology, 167 Albany St., Cambridge, MA, USA |
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Abstract: | 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 HE11 mode and 6% of LP11 odd (HE21+TE01) 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. |
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