Speaker
Description
A low-emittance magnetic bunch compressor is being developed for the injector of the SILA 4th generation synchrotron light source. The target beam parameters are 250 MeV beam energy, 300 pC bunch charge, and an initial bunch duration of about 7 ps. Under these conditions, bunch compression is strongly affected by coherent synchrotron radiation (CSR), longitudinal space charge, and optics mismatch, which can lead to significant projected emittance growth. We present the design and optimization of a compressor lattice aimed at maximizing compression efficiency while preserving transverse beam brightness. Several layouts were studied, with emphasis on achromatic optics, matching between dispersive sections, and minimization of the horizontal beta-function in the downstream dipoles, where CSR effects are strongest. Beam dynamics simulations were performed with elegant including CSR and longitudinal space charge. The results show that an achromat-based compressor provides a more favorable compromise between compression and emittance preservation for the SILA operating regime.
Footnotes
[1] Arclike variable bunch compressors, Peter H. Williams, Gustavo Pérez-Segurana, Ian R. Bailey, Sara Thorin, Bill Kyle, Jonas Björklund Svensson Phys. Rev. Accel. Beams 23, 100701
[2] Second-order achromat design based on FODO cell Yipeng Sun SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA PHYSICAL REVIEW SPECIAL TOPICS - ACCELERATORS AND BEAMS 14, 060703 (2011)
[3] M. Borland, "elegant: A Flexible SDDS-Compliant Code for Accelerator Simulation,"Advanced Photon
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