FZJ SMALLEST SC TRIPLE-SPOKE CAVITY

The paper describes the design, fabrication and test results of the smallest superconducting triple-spoke cavity (resonant frequency 760 MHz, β=0.2) developed at Forschungszentrum Juelich. CAVITY DESIGN The cavity electrodynamics design aims to optimise the cavity geometry to reach the highest accelerating efficiency, in other words to minimize values of peak electrical and magnetic fields on the cavity surface relative to the accelerating electrical field on the cavity axis (Bpk/Eacc and Epk/Eacc). The detailed cavity RF analyses have been published elsewhere [1]. The geometry and parameters of the cavity are shown in Fig.