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The coherent synchrotron radiation (CSR) of a high brightness electron beamtraversing a series of dipoles, such as transport or recirculation arcs, mayresult in the microbunching instability ({\mu}BI). To accurately quantify thedirect consequence of this effect, we further extend our previously developedsemi-analytical Vlasov solver [C. -Y. Tsai et al., FEL Conference 2014(THP022)] to include more relevant coherent radiation models than thesteady-state free-space CSR impedance, such as the entrance and exit transienteffects derived from upstream beam entering to and exiting from individualdipoles. The resultant microbunching gain functions and spectra for our examplelattices are presented and compared with particle tracking simulation. Someunderlying physics with inclusion of these effects are also discussed.

CSR induced microbunching gain estimation including transient effects in transport and recirculation arcs