Title :
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
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;
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
DOI :
10.1109/ICIMW.2009.5324607
