TITLE

Separation of band-gap overlap in a coaxial Bragg structure operating in higher-order mode at Terahertz frequency

AUTHOR(S)
Ying-Xin Lai; Shi-Chang Zhang
PUB. DATE
March 2008
SOURCE
Physics of Plasmas;Mar2008, Vol. 15 Issue 3, p033301
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Band-gap overlap always occurs when an overmoded coaxial Bragg structure operates in the Terahertz frequency spectrum, which may cause serious competition of undesired modes with the operating mode at the operating frequency. In the present paper it is revealed that band-gap overlap of modes can be efficiently separated by setting the phase difference between the outer- and inner-conductor corrugations to be π. Moreover, the residual side-lobes interaction of the involved modes in a coaxial Bragg structure can be entirely eliminated by applying Hamming-window distribution to both the outer-conductor and inner-rod corrugations. These peculiarities provide potential advantage in constructing a coaxial Bragg cavity with high quality factor for single higher-order-mode operation of a high-power free-electron maser in the Terahertz frequency range.
ACCESSION #
31520932

 

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