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TY - UNPB AU - Lou, W. AU - Hoffstaetter, G.H. AU - Mayes, C.E. AU - Sagan, D. ED - Meseck, Atoosa ED - McAteer, Meghan ED - Schaa, Volker R.W. ED - V\xF6lker, Jens TI - CSR Phase Space Dilution in CBETA J2 - Proc. of ERL2019, Berlin, Germany, 15-20 September 2019 CY - Berlin, Germany T2 - ICFA Advanced Beam Dynamics Workshop on Energy Recovery Linacs T3 - 63 LA - english AB - While Energy Recovery Linac (ERLs) give promise to deliver unprecedentedly high beam current with simultaneously small emittance, Coherent Synchrotron Radiation (CSR) can pose detrimental effect on the beam at high bunch charges and short bunch lengths. CBETA, the Cornell BNL ERL Test Accelerator, will be the first multi-turn ERL with SRF accelerating cavities and Fixed Field Alternating gradient (FFA) beamline. To investigate the CSR effects on CBETA, the established simulation code Bmad has been used to track a bunch with different CSR parameters. We found that CSR causes phase space dilution, and the effect becomes more significant as the bunch charge and recirculation pass increase. Convergence tests have been performed for the CSR parameters to validate the observed micro-bunching instability. Potential ways to mitigate the effect involving vacuum chamber shielding and increasing bunch length are also being investigated. PB - JACoW Publishing CP - Geneva, Switzerland ER -