Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA
JLab, Newport News, Virginia, USA
It is known that microbunching instability (MBI) has been one of the most challenging issues with the design of magnetic compressor chicanes for FEL or linear colliders, as well as the transport lines for recirculating or energy recovery linacs. To more accurately quantify MBI in a single-pass or few-passes system and for more complete analyses, we extend our previously developed linear Vlasov solver* to incorporate more relevant impedance models, including transient and steady-state CSR and LSC impedances. Then the linearized Vlasov equation is numerically solved for the microbunching gain amplification factor. With application of this code to two specially designed transport arcs** and a circulator cooling ring design of MEIC at Jefferson Lab***, the resultant gain functions and spectra are presented and some results are compared with particle tracking simulation. We also discuss some underlying physics with inclusion of these collective effects. It is anticipated this more complete analysis can further improve the understanding of the MBI mechanisms and shed light on how to suppress or compensate MBI effects in such lattice designs.
* C. -Y. Tsai et al., FEL'14, or http://arxiv.org/abs/1408.5542
** D. Douglas et al., JLAB-ACP-14-1751, or http://arxiv.org/abs/1403.2318
*** MEIC Design Summary, at http://arxiv.org/abs/1504.07961
