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| WG324 |
Single Bunch Emittance Preservation in XFEL Linac
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33 |
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- V. M. Tsakanov, G. A. Amatuni
CANDLE, Yerevan
- R. Brinkmann, W. Decking
DESY, Hamburg
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The single bunch emittance preservation in booster and main linacs of European XFEL project is presented. The wakefield and chromatic dilution of the beam emittance caused by free betatron oscillations, cavity and modules offset misalignments and random tilts are evaluated. The effects of cavities misalignments correlation along the linac are discussed. The effects of quadrupole misalignments and the corresponding trajectory steering based on one-to-one correction technique are given. The residual chromatic emittance dilution of the corrected trajectory is evaluated.
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Slides
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| WG554 |
Post-Linac Collimation System for the European XFEL
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- V. Balandin, R. Brinkmann, N. Golubeva
DESY, Hamburg
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The collimation system should simultaneously fulfil several different functions. In first place, during routine operations, it should remove with high efficiency off-momentum and large amplitude halo particles, which could be lost inside undulator modules and become source of radiation-induced demagnetization of the undulator permanent magnets. The system also must protect the undulator modules and other downstream equipment against mis-steered and off-energy beams in the case of machine failure without being destroyed in the process. From beam dynamics point of view, the collimation section should be able to accept bunches with different energies (up to ± 1.5% from nominal energy) and transport them without deterioration not only of transverse, but also of longitudinal beam parameters. In this article we present the post-linac collimation system which fulfils the listed above requirements and compare some of its properties with properties of the collimation system of the FLASH linac.
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Slides
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