Speaker
Description
The design of the CLIC main beam injector linacs requires high-gradient, traveling-wave accelerating structures capable of handling substantial beam-loading effects due to high beam currents. In this work, we present a comprehensive design and optimization study of 2 GHz traveling-wave structures for the electron and positron linacs, which accelerate beams up to 2.8 GeV with a nominal bunch charge of 1 nC, and the booster linac, reaching 9 GeV with a 0.83 nC bunch charge. Each bunch train consists of 352 bunches, necessitating careful management of beam dynamics and wakefield effects.
Using analytical modeling and extensive parameter scans, we optimized the iris geometry to enhance shunt impedance, reduce surface electric fields, and suppress long-range wakefields through detuning strategies. Beam-loading effects were analyzed, and compensation techniques were implemented to minimize bunch-to-bunch energy spread, ensuring stable and efficient acceleration.
This study advances the development of high-performance linac structures capable of operating with high beam currents, supporting the reliable achievement of CLIC performance goals.
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