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The spectral brightness of a free-electron laser (FELs) is strongly dependent on the properties of the electron beam used to generate the radiation. Bunches used to drive FELs must have high currents, which are produced through longitudinal bunch compression. However, collective effects (such as coherent synchrotron radiation) degrade the emittance and energy spread during the bunch compression process, which in turn reduces the spectral brightness. A compression scheme for an FEL must be designed to reduce the impact of collective effects on the electron distribution in order to generate high spectral brightness FEL pulses. In this paper we compare commonly used four-dipole chicanes to two alternative bunch compressor configurations that are designed to mitigate coherent synchrotron radiation. We show that compression can be achieved with much reduced emittance degradation compared to 4-dipole chicanes in two cases: arc compression of positively chirped bunches, and 5-dipole compression of negatively chirped bunches. Each is suited to different FEL schemes.
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