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      Dechirper Wakefields for Short Bunches

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          Abstract

          In previous work [1] general expressions, valid for arbitrary bunch lengths, were derived for the wakefields of corrugated structures with flat geometry, such as is used in the RadiaBeam/LCLS dechirper. However, the bunch at the end of linac-based X-ray FELs--like the LCLS--is extremely short, and for short bunches the wakes can be considerably simplified. In this work, we first derive analytical approximations to the short-range wakes. These are generalized wakes, in the sense that their validity is not limited to a small neighborhood of the symmetry axis, but rather extends to arbitrary transverse offsets of driving and test particles. The validity of these short-bunch wakes holds not only for the corrugated structure, but rather for any flat structure whose beam-cavity interaction can be described by a surface impedance. We use these wakes to obtain, for a short bunch passing through a dechirper: estimates of the energy loss as function of gap, the transverse kick as function of beam offset, the slice energy spread increase, and the emittance growth. In the Appendix, a more accurate derivation--than is found in [1]--of the arbitrary bunch length wakes is performed; we find full agreement with the earlier results, provided the bunches are short compared to the dechirper gap, which is normally the regime of interest. [1] K. Bane and G. Stupakov, Phys. Rev. ST Accel. Beams 18, 034401(2015).

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          Author and article information

          Journal
          2016-01-26
          2016-03-22
          Article
          10.1016/j.nima.2016.02.055
          1601.07226
          340e6866-405f-4068-b093-5931cb18d693

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          Custom metadata
          SLAC-PUB-16457, LCLS-II TN-16-01
          26 pages, 1 figure
          physics.acc-ph

          High energy & Particle physics
          High energy & Particle physics

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