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Zholents, A.

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TUP046 Linac Design for an Array of Soft X-Ray Free Electron Lasers 501
  • A. Zholents, G. Penn, J. Qiang, M. Venturini, R.P. Wells
    LBNL, Berkeley, California
  • E. Kur
    UCB, Berkeley, California

Funding: This work was supported by the U.S. Department of Energy under Contract No. DE-AC02-05CH11231
The design of the linac delivering the electron bunches into ten independent soft x-ray free electron lasers (FELs) is presented. The bunch repetition rate in the linac is 1 MHz and the bunch repetition rate in each FEL beam line is 100 kHz. Various issues regarding machine layout and lattice, bunch compression, collimation, and the beam switch yard are discussed. Particular attention is given to collective effects. A demanding goal is to preserve both a low beam slice emittance and low slice energy spread during acceleration, bunch compression and distribution of the electron bunches into the array of FEL beamlines. Detailed studies of the effect of the electron beam microbunching resulting from longitudinal space-charge forces and coherent synchrotron radiation as the beam undergoes compression have been carried out and are presented.

FR105 Billion Particle Linac Simulations for Future Light Sources 1110
  • J. Qiang, R.D. Ryne, M. Venturini, A. Zholents
    LBNL, Berkeley, California

Funding: This work was supported by the Office of Science, U.S. Department of Energy under DOE contract number DE-AC03-76SF00098.
In this paper, we will report on a billion macroparticle simulation of beam transport in a free electron laser (FEL) linac for future light source applications. The simulation includes a self-consistent calculation of 3D space-charge effects, short-range geometry wakefields, longitudinal coherent synchrotron radiation (CSR) wakefields, and detailed modeling of rf acceleration and focusing. We will discuss the needs and the challenges for such large-scale simulation. Application to the study of microbunching instability in the FEL linac will also be presented.


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