P3-3: Measurement of loss in high power 170 GHz gyrotron transmission lines

Author

Kowalski, Elizabeth J. ; Nanni, Emilio A. ; Shapiro, Michael A. ; Sirigiri, Jagadishwar R. ; Temkin, Richard J. ; Bigelow, Timothy S. ; Rasmussen, David A.

Author_Institution

MIT Plasma Sci. & Fusion Center, Cambridge, MA, USA

fYear

2010

fDate

18-20 May 2010

Firstpage

335

Lastpage

336

Abstract

Over-moded corrugated cylindrical waveguides are used for high power gyrotron radiation transmission applications, such as ITER, because of their low loss characteristics at millimeter wavelengths. Measurements on such over-moded systems are fraught with inaccuracies due to higher order modes. We report a new technique to accurately measure the inherent loss of an over-moded device in the desired operation mode. This technique is demonstrated successfully on low-power measurements at 170 GHz in 63.5 mm diameter corrugated ITER transmission lines. We find the miter bend loss to be 0.022 ± 0.008 dB (0.5 ± 0.2 %), in good agreement with theory.

Keywords

circular waveguides; gyrotrons; ITER transmission lines; frequency 170 GHz; gyrotron radiation transmission; gyrotron transmission lines; loss measurement; low-power measurement; millimeter wavelengths; over-moded corrugated cylindrical waveguides; Gyrotrons; Loss measurement; Millimeter wave measurements; Millimeter wave technology; Power measurement; Power transmission lines; Propagation losses; Transmission line measurements; Transmission line theory; Wavelength measurement; gyrotrons; millimeter wave measurement; over-moded; transmission lines; waveguide bends;

fLanguage

English

Publisher

ieee

Conference_Titel

Vacuum Electronics Conference (IVEC), 2010 IEEE International

Conference_Location

Monterey, CA

Print_ISBN

978-1-4244-7098-3

Type

conf

DOI

10.1109/IVELEC.2010.5503412

Filename

5503412