Measurement of RF Mode Purity in EC Transmission Test Line for ITER

Journal Article · Thu Nov 26 04:00:00 EST 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3273808· OSTI ID:21335784

Oda, Yasuhisa; Kajiwara, Ken; Takahashi, Koji; Kasugai, Atsushi; Sakamoto, Keishi ^[1]

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1. Japan Atomic Energy Agency, Naka, Ibaraki (Japan)

The transmission mode purity was measured at the ITER relevant transmission line for 170 GHz ECH and CD system. The measured purity of HE{sub 11} in transmission power was 73% and the other was higher order modes. The dominant higher order mode was LP{sub 11} mode (HE{sub 21}+TE{sub 01}). To improve the mode purity, the RF beam coupling in MOU was aligned because LP{sub 11} mode is generated the offset and the tilt angle of RF beam at the waveguide inlet. After the alignment, HE{sub 11} mode purity was increased to 87%.

• OSTI ID: 21335784
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1187; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALIGNMENT
COUPLING
CYCLOTRON RESONANCE
ECR CURRENT DRIVE
ECR HEATING
GHZ RANGE
ITER TOKAMAK
MICROWAVE AMPLIFIERS
MICROWAVE RADIATION
PLASMA
PLASMA WAVES
POWER TRANSMISSION
WAVEGUIDES