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Title: A NEW CONCEPT FOR HIGH POWER RF COUPLING BETWEEN WAVEGUIDES AND RESONANT RF CAVITIES

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. As a result, we describe the mode converter from the waveguide to the TE11 coax line, outline the characteristics and performancemore » limits of the coupler and provide a detailed worked out example in the challenging area of coupling to a superconducting accelerator cavity.« less
Authors:
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Publication Date:
Report Number(s):
BNL-113875-2017-JA
Journal ID: ISSN 1937-6472; R&D Project: KBCH139; 18034; KB0202011
Grant/Contract Number:
SC00112704
Type:
Accepted Manuscript
Journal Name:
Progress in Electromagnetics Research B
Additional Journal Information:
Journal Volume: 75; Journal ID: ISSN 1937-6472
Publisher:
EMW Publishing
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; high power microwave systems; particle accelerators; resonators; RF device modeling and characterization; superconducting components and technology
OSTI Identifier:
1361403