Speaker
Description
In new-generation synchrotron light sources, triple-radio-frequency (triple-RF) systems are proposed to meet larger bunch lengthening requirements and enable specific longitudinal injection conditions. In this talk, we will present beam dynamics analysis for the superconducting triple-RF system designed for the Hefei Advanced Light Facility (HALF) storage ring. We will demonstrate that a particular beam instability imposes stringent requirements on the R/Q values of the triple-RF system, mainly for the higher harmonic cavities. For HALF, our findings reveal that the R/Q values of the two higher harmonic cavities need to be reduced to approximately 10 or below to achieve the optimal bunch lengthening. Such exceptionally low R/Q values pose new issues and challenges for the design of higher harmonic cavities.
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