Twelve higher-order modes (HOMs) in the single-cell accelerating cavities for the Advanced Photon Source (APS) storage ring were calculated to have complex impedances that will cause coupled-bunched instabilities near or below the 300mA positron current which is the design goal. Some of these modes couple, through the coupling loop, from the storage ring cavity into the waveguide. This study investigates the transmission of these modes from the cavity into the waveguide. The standing wave ratio (VSWR) of a WR2300 hybrid waveguide component has been measured at each HOM frequency, and its effect on the transmitted modes in the waveguide is studied.


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    Title :

    Higher-order modes in the APS storage ring waveguides


    Contributors:
    S. O. Brauer (author) / R. L. Kustom (author)

    Publication date :

    1993


    Size :

    4 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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