NSLS-II Seminar

"Two-dimensional Mean Field Treatment of Coherent Synchrotron Radiation Effects with Application to Microbunching Instability in Bunch Compressors"

Presented by Gabriele Bassi, University of Liverpool and Cockcroft Institute

Thursday, March 18, 2010, 1:30 pm — NSLS-II Seminar Room, Bldg. 817

Bunch compressors, designed to increase the peak current, can lead to a microbunching instability driven by an increased coherent synchrotron radiation (CSR) at wavelengths shorter than the bunch length, with
detrimental effects on the beam quality. This is a major concern for free electron lasers (FELs) where very bright electron beams are required, i.e. beams with low emittance and energy spread. We have developed a parallel code based on a two-dimensional mean field treatment of CSR effects. The two-dimensional charge/current distribution is represented by a Fourier series in beam frame, with
coefficients determined through Monte Carlo sampling over an ensemble of tracked points. This method, used in statistical density estimation, gives a globally smooth distribution with low noise. The field equations
are solved accurately in the lab frame using retarded potentials and a novel choice of integration variables that eliminates singularities. We will discuss our algorithm and its application to the microbunching
instability for the bunch compressor system of the FERMI@Elettra FEL.

Hosted by: Sam Krinsky

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