RF design of accelerating structure for the main linac of the klystron-based first stage of CLIC at 380 GeV

An alternative klystron-based scenario for the first stage of Compact Linear Collider (CLIC) at 380 GeV center-of-mass energy was proposed. Compared to the two-beam scheme, klystron-based one is easily tested and implemented, and is expected to reduce the cost of the first stage at 380 GeV. The RF design and parameters of the klystron-based accelerating structure named CLIC-K are described in this paper. The optimization of the high-order-mode (HOM) damping loads used to suppress the long-range transverse wakefield is also presented