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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