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

被引：28

作者：

Oda, Yasuhisa ^{[1
]}

Kajiwara, Ken ^{[1
]}

Takahashi, Koji ^{[1
]}

Kasugai, Atsushi ^{[1
]}

Shapiro, Michael A. ^{[2
]}

Temkin, Richard J. ^{[2
]}

Sakamoto, Keishi ^{[1
]}

机构：

[1] Japan Atom Energy Agcy, Naka Fus Res Inst, Plasma Heating Res Grp, Naka, Ibaraki, Japan

[2] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA

来源：

JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES | 2010年 / 31卷 / 08期

关键词：

ITER; Corrugated waveguide; Gyrotron; Mode content; CORRUGATED WAVE-GUIDE; GYROTRON; DESIGN;

D O I：

10.1007/s10762-010-9666-4

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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.

引用

页码：949 / 957

页数：9

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