Mode retrieval from intensity profile measurements using irradiant waveguide-modes

Author

Idei, H. ; Shapiro, M.A. ; Temkin, R.J. ; Shimozuma, T. ; Kubo, S.

Author_Institution

Res. Inst. for Appl. Mech., Kyushu Univ., Kasuga, Japan

fYear

2009

fDate

21-25 Sept. 2009

Firstpage

1

Lastpage

2

Abstract

The fields radiated from the waveguide were used to analyze propagating mode content in an oversized circular corrugated waveguide. The radiated fields were calculated by the Kirchhoff integral in the paraxial approximation. The irradiant waveguide modes of the radiated field are orthogonal within the paraxial approximation. The complex fractions in the irradiant mode expansion were deduced from an iteration process in which the reconstructed amplitude profile from the complex fractions coincided with the measured amplitude profile.

Keywords

circular waveguides; modal analysis; plasma radiofrequency heating; Kirchhoff integral; amplitude profile; circular corrugated waveguide; complex fractions; electron cyclotron heating; intensity profile measurements; irradiant mode expansion; irradiant waveguide-modes; iteration process; mode retrieval; paraxial approximation; plasma heating; plasma production; Apertures; Content based retrieval; Distortion measurement; Gyrotrons; Heating; Helium; Mirrors; Optical coupling; Phase measurement; Plasma measurements;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared, Millimeter, and Terahertz Waves, 2009. IRMMW-THz 2009. 34th International Conference on

Conference_Location

Busan

Print_ISBN

978-1-4244-5416-7

Electronic_ISBN

978-1-4244-5417-4

Type

conf

DOI

10.1109/ICIMW.2009.5324607

Filename

5324607