Y. Kang (Argonne National Laboratory, Argonne, IL 60439)
A radiofrequency (rf) cavity resonator requires a coupling structure that can transfer the rf power from a generator to the cavity through a waveguide transmission line. For high-power operation in charged particle accelerators, the coupler window experiences enormous stresses due to charging induced by the high-energy charged particle beam passing by and rf power dissipation. Another common problem with such a cavity input coupler is the harmful asymmetrical rf kick on the beam at the coupler-cavity interface. The above problems are common to both normal conducting and superconducting rf accelerators. In superconducting structures, since the frequency of operation is usually around 1GHz, compactness of the coupler is also a great concern for the cryostat design. A waveguide coupler design that can exclude the above-mentioned problems is presented.
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