RF design of an integrated X-band mode-launcher for an open-structure TW LINAC

In this paper, we present the RF design of a mode-launcher integrated with an open-type, multi-cell 12 GHz 4-sector structure. The electromagnetic design is carried out using the 3D full-wave electromagnetic solver CST-Microwave Studio. To ensure compactness, a key focus of the integration process is the minimization of the distance between the coupler cell and the accelerating open structure. We evaluate the feasibility of two solutions: two conventional couplers, and another configuration with two mode-launchers employed at both the input and output ends of the accelerating structure. A comparison is performed to assess the performance of the proposed design