CERN Accelerating science

Preprint
Report number	CERN-ACC-2024-0001 ; CLIC-Note-1196
Title	Design of the RF waveguide network for the klystron-based CLIC main linac RF Module
Author(s)	Wang, Ping (CERN) ; Capstick, Matthew John ; Catalan Lasheras, Nuria (CERN) ; Doebert, Steffen (CERN) ; Grudiev, Alexej (CERN) ; Rossi, Carlo (CERN) ; Morales Sanchez, Pedro (CERN) ; Syratchev, Igor (CERN) ; Wu, Xiaowei
Publication	2024
Imprint	28 Mar 2024
Number of pages	24
Subject category	Accelerators and Storage Rings
Study	CLIC
Abstract	The klystron-based Compact Linear Collider (CLIC) was initially proposed with a low center-of-mass energy of 380 GeV, primarily due to potential cost-effectiveness. To enhance overall cost-efficiency, reliability, and stability, a novel RF module for klystron-based CLIC main linac has been designed and studied. This RF module utilizes two X-band klystrons to feed eight traveling wave accelerating structures, resulting in a beam energy increase of 138 MeV. A key innovation of the new RF module is the integration of double-height waveguides, which contributes to a 30% reduction in surface fields and a 40% decrease in RF loss. To meet the double-height requirement, a majority of the RF components responsible for transmitting the high RF power underwent a redesign. Two solutions, based on the choke mode flange and the L-shape waveguide, were proposed to facilitate the adjustment of the accelerating structures for beam-based alignment. Additionally, bent damping waveguides and HOM loads and a high order Magic-T, were designed for the accelerating structure named CLIC-K. The paper will comprehensively present and describe both the RF design and the integration of the klystron-based CLIC module.
Submitted by	maria.filippova@cern.ch