Abstract
The high order mode (HOM) power losses induced by a particle beam in accelerator components should be taken into account during their design and the choice of HOM couplers. In this work the power losses due to HOMs in the proposed 400.79 MHz radio frequency (rf) cavity designs were evaluated for various energy options (Z, W, H, and $\mathrm{t}\overline{\mathrm{t}}$) of the future circular electron-positron collider (FCC-ee). The constraints for the rf cavity design are dictated by the Z machine with the lowest beam energy, but the highest beam current. Still certain beam filling patterns (bunch and train spacings) are not feasible and should be avoided in beam operation. For other energy options the power loss are sufficiently low and can be extracted by conventional HOM couplers.
Highlights
The rf power and heat load deposited by a beam passing through the accelerator structures can cause significant limitations for the machine performance
To determine parameters for high order mode (HOM) absorbers accurate estimations of the power loss are required, which depend both on the beam parameters and the geometric design of rf cavities
IV we present the results of power loss calculations for different cavity options and all future circular electron-positron collider (FCC-ee) machines
Summary
The rf power and heat load deposited by a beam passing through the accelerator structures can cause significant limitations for the machine performance. The power loss can be calculated as [1,2]. The evaluation of the power losses in superconducting rf cavities for FCC-ee is the subject of the present work. We applied a systematic approach to power loss calculation taking into account different filling schemes used in machine operation. This allows us to derive recommendations for the both cavity design and machine operation.
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