Abstract
Higher-order modes (HOMs) may affect beam stability and refrigeration requirements of superconducting cavity such as the 166.6 MHz SC cavity, which is studied at IHEP. Under certain conditions, beam-induced HOMs can accumulate sufficient energy to destabilize the beam or quench the superconducting cavities. In order to limit these effects, we consider the use of the HOM coupler with HOMs extraction on the cutoff tubes of the 166.6 MHz SC cavity. The HOM coupler can deeply suppress the fundamental mode and efficiently extract dangerous high-order modes. In this paper, the HOM coupler design process is presented, which operates at 166.6 MHz. The RF and thermal behavior are discussed. In order to verify the designs, a rapid prototype for the favored coupler was fabricated and characterized on a low-power test stand.
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