A traveling-wave resonator for exciting whispering-gallery modes in an overmoded circular waveguide

Theodore A. Hea

doi:10.1117/12.2298598

30 August 1993 A traveling-wave resonator for exciting whispering-gallery modes in an overmoded circular waveguide

Theodore A. Hea

Proceedings Volume 2104, 18th International Conference on Infrared and Millimeter Waves; 21044M (1993) https://doi.org/10.1117/12.2298598
Event: 18th International Conference on Infrared and Millimeter Waves, 1993, Colchester, United Kingdom

Abstract

Several gyrotrons currently under development have cavities that operate in rotating TEnm modeswith very high azimuthal indices m such as a rotating TE15,2 or TE22,2 circular waveguide mode. If n<< m as well, these modes are sometimes called whispering gallery modes. It is desirable to be able toproduce these modes at low power from the TEio mode in standard dominant-mode rectangularwaveguide so that components to be used within or in conjunction with these gyrotrons can be moreeasily tested. Recently we discussed the principles of operation of a device which can be used to generatesuch high azimuthal index modes using an azimuthal array of apertures in the circular waveguide [1].Other methods of generating WG modes have also been developed. One uses a helical multifoil [2], andanother uses a cylindrical input cavity within a coaxial cavity [3]. The azimuthal aperture array methodhas the possible advantage that more than one different WG mode with the same azimuthal index, m,could be generated with the same device. Also, both senses of rotation and any degree of rotation,including a stationary mode, can be produced with one device for possible testing purposes.

Citation Download Citation

Theodore A. Hea "A traveling-wave resonator for exciting whispering-gallery modes in an overmoded circular waveguide", Proc. SPIE 2104, 18th International Conference on Infrared and Millimeter Waves, 21044M (30 August 1993); https://doi.org/10.1117/12.2298598

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available