The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - UNPB AU - Yao, Z.Y. AU - Laxdal, R.E. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - Balloon Single Spoke Resonator - A New Variant for Reduced Multipacting J2 - Proc. of SRF2019, Dresden, Germany, 30 June-05 July 2019 CY - Dresden, Germany T2 - International Conference on RF Superconductivity T3 - 19 LA - english AB - Spoke resonators have been widely proposed and optimized for various applications. Good performance has been demonstrated by many cavity tests. Accompanying the great progress, the adverse impact of strong multipacting (MP) is also noted, consistent with modern 3D simulations. This paper will discuss MP behaviors in the single spoke resonator (SSR). In particular a phenomenological theory is developed to highlight the details of the geometry that affect MP. The analysis leads to an optimized geometry of a single spoke resonator defined here as the ’balloon’ geometry. TRIUMF has designed, fabricated and tested the first balloon SSR at 325 MHz and β=0.3. Cold tests proved the principle of the balloon concept, the elimination of MP barriers around the operational gradient. This paper will also report the details of the mechanical and RF design, the fabrication steps and recent cold test results. PB - JACoW Publishing CP - Geneva, Switzerland ER -