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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2017-05-17
A New Concept for High Power RF Coupling Between Waveguides and Resonant RF Cavities
By
Chen Xu,

    Professor Chen Xu

    Brookhaven National Lab

    USA

    Homepage

Ilan Ben-Zvi,

    Dr. Ilan Ben-Zvi

    Brookhaven National Lab

    USA

    Homepage

Haipeng Wang,

    Dr. Haipeng Wang

    Thomas Jefferson National Accelerator Facility

    USA

    Homepage

Tianmu Xin,

    Dr. Tianmu Xin

    Brookhaven National Lab

    USA

    Homepage

Liling Xiao

    Dr. Liling Xiao

    SLAC National Accelerator Laboratory

    USA

    Homepage

Progress In Electromagnetics Research B, Vol. 75, 59-77, 2017
doi:10.2528/PIERB17022604 | Google Scholar

Abstract
Microwave engineering of high average-power (hundreds of kilowatts) devices often involves a transition from a waveguide to a device, typically a resonant cavity. This is a basic operation, which finds use in various application areas of significance to science and industry. At relatively low frequencies, L-band and below, it is convenient, sometimes essential, to couple the power between the waveguide and the cavity through a coaxial antenna, forming a power coupler. Power flow to the cavity in the fundamental mode leads to a Fundamental Power Coupler (FPC). High-order mode power generated in the cavity by a particle beam leads to a high-order mode power damper. Coupling a cryogenic device, such as a superconducting cavity to a room temperature power source (or damp) leads to additional constraints and challenges. We propose a new approach to this problem, wherein the coax line element is operated in a TE11 mode rather than the conventional TEM mode. We will show that this method leads to a significant increase in the power handling capability of the coupler as well as a few other advantages. We describe the mode converter from the waveguide to the TE11 coax line, outline the characteristics and performance limits of the coupler and provide a detailed worked out example in the challenging area of coupling to a superconducting accelerator cavity.
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Citation
Chen Xu, Ilan Ben-Zvi, Haipeng Wang, Tianmu Xin, and Liling Xiao, "A New Concept for High Power RF Coupling Between Waveguides and Resonant RF Cavities," Progress In Electromagnetics Research B, Vol. 75, 59-77, 2017.
doi:10.2528/PIERB17022604
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