Transverse space-charge induced microbunching instability in high-brightness electron bunches

Venturini, M.; Qiang, Ji

doi:10.1103/physrevstab.18.054401

Cited by 3 publications

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Conditions for coherent-synchrotron-radiation-induced microbunching suppression in multibend beam transport or recirculation arcs

Tsai

Mitri

Douglas

et al. 2017

Phys. Rev. Accel. Beams

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The coherent synchrotron radiation (CSR) of a high brightness electron beam traversing a series of dipoles, such as recirculation or transport arcs, may lead to the microbunching instability. We extend and develop a semianalytical approach of the CSR-induced microbunching instability for a general lattice, based on the previous formulation with 1-D CSR model [1] and apply it to investigate the physical processes of microbunching amplification for two example transport arc lattices. We find that the microbunching instability in transport arcs has a distinguishing feature of multistage amplification (e.g, up to 6 th stage for our example arcs in contrast to two stage amplification for a 3-dipole chicane [2]). By further extending the concept of stage gain as proposed by Huang and Kim [2], we developed a method to quantitatively characterize the microbunching amplification in terms of iterative or staged orders that allows the comparison of optics impacts on microbunching gain for different lattices. The parametric dependencies and Landau damping for our example lattices are also studied. Excellent agreement of the gain functions and spectra from Vlasov analysis with results from ELEGANT is achieved which helps to validate our analyses.

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