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TY - UNPB AU - Hoffstaetter, G.H. ED - Ramberger, Suitbert ED - Schaa, Volker RW TI - Beam Dynamics Issues for Multi-Pass ERLs J2 - Proc. of ERL2017, Geneva, Switzerland, 18-23 June 2017 C1 - Geneva, Switzerland T2 - ICFA Advanced Beam Dynamics Workshop on Energy Recovery Linacs T3 - 59 LA - english AB - Several labs have proposed multi-turn ERLs as electron-drivers for major experiments. The beam dynamics of the 4-turn ERL CBETA will be studied in detail to understand the beam-dynamic issues for these electron drivers. These issues include: (a) current limits by the recirculative beam-breakup instability(BBU) and its control by HOM damping, optics adjustments, and optical coupling, (b) ions attracted to the electron beam and their control by clearing electrodes, current modulations, and beam shaking, (c) loss mechanism including Touschek scattering, gas scattering, field emission, ghost pules, and spurious emotions from the cathode, (d) high-chromaticity operation, orbit and optics controls of superimposed beams, coherent synchrotron radiation, micro-bunching, and longitudinal space charge, and (e) low energies space charge and emittance control PB - JACoW CP - Geneva, Switzerland ER -