Preliminary design of constant-gradient accelerating structure with choke-mode cavity

A damped linear accelerating structure using a choke-mode cavity has been proposed for future e+e− linear colliders as the main accelerating structure [1]. A constant-gradient C-band accelerating structure was designed using the MAFIA code [2,3]. The operation mode and frequency are 3π4 and 5.712 GHz. The Q-value of the accelerating structure is about 84% of conventional accelerating structures, and the shunt impedance is about 75% of conventional accelerating structures. The total attenuation (τ) of the accelerating structure with a choke cavity shows a 35% increase compared to that of a conventional disk-loaded accelerating structure. This paper presents the preliminary simulation results.