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Abstract: In this article, a feasible switchyard design is proposed for the Shanghai soft X-ray Free Electron Laser (SXFEL) facility. In the proposed scheme, a switchyard is used to transport the electron beam to different undulator lines. Three-dimensional start-to-end simulations have been carried out to research the beam dynamic during transportation. The results show that the emittance of the electron beam increases less than 8%, meanwhile, the peak current, the energy spread and the bunch length are not spoiled as the beam passes through the switchyard. The microbunching instability of the beam and the jitter of the linear accelerator (linac) are analyzed as well.
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Key words:
- switchyard /
- resistive wall effects /
- microbunching instability /
- jitter
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Figure 4. Longitudinal wakefield behind a point charge in a round, metallic pipe with various radii (s is inner length of bunch)
Figure 5. Variation of central energy along beam for various pipe radii at exit of FODO cells
Figure 6. Emittance evolution through the switchyard (a) and energy and current distributions at exit of switchyard (b)
Table 1. Main linac parameters of SXFEL
electron beam energy/GeV peak current/A charge/pC bunch length
(FWHM)/fstransverse normalized emittance/(mm·mrad) repeat frequency/Hz 1.5 700 500 ~700 1 50 
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Table 2. Summary of trajectory jitters
mechanism RMS error Ax/% Ay/% corrector current 5×10-4 5 7 bend current 5×10-5 2 0 quad vibration 150 nm 5 8 quad current 2×10-4 5 4 quad misalignment 200 μm kicker 5×10-4 12 0 septum 1×10-5 4 0 CSR+σz jitter 5% 10 0 total (RMS) 18 11
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