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Longitudinal beam dynamics with a higher-harmonic cavity for bunch lengthening

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We discuss the longitudinal beam dynamics in storage rings in the presence of a higher-harmonic cavity (HHC) system for bunch lengthening. First, we review the general conditions for HHC operations,… Click to show full abstract

We discuss the longitudinal beam dynamics in storage rings in the presence of a higher-harmonic cavity (HHC) system for bunch lengthening. First, we review the general conditions for HHC operations, both in active or passive modes, assuming the stability of the system. For uniform filling patterns, a distinction is made between operations with a normal-conducting HHC, where optimal conditions for bunch lengthening can be satisfied, and operations with a super-conducting HHC, where optimal conditions can be met only approximately. Second, we discuss the option to operate the NSLS-II storage ring with a passive, super-conducting third harmonic cavity (3HC) system. The stability and performance of the system in the presence of a gap in the uniform filling, which corresponds to the present mode of operation of the NSLS-II storage ring, is investigated with self-consistent Vlasov–Fokker–Planck simulations performed with the code SPACE. [G. Bassi, A. Blednykh and V. Smaluk, Phys. Rev. Accel. Beams 19, 024401 (2016).]

Keywords: beam dynamics; bunch lengthening; higher harmonic; longitudinal beam; harmonic cavity

Journal Title: International Journal of Modern Physics A
Year Published: 2018

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