• Open Access

Linear microbunching analysis for recirculation machines

C.-Y. Tsai, D. Douglas, R. Li, and C. Tennant
Phys. Rev. Accel. Beams 19, 114401 – Published 28 November 2016

Abstract

Microbunching instability (MBI) has been one of the most challenging issues in designs of magnetic chicanes for short-wavelength free-electron lasers or linear colliders, as well as those of transport lines for recirculating or energy-recovery-linac machines. To quantify MBI for a recirculating machine and for more systematic analyses, we have recently developed a linear Vlasov solver and incorporated relevant collective effects into the code, including the longitudinal space charge, coherent synchrotron radiation, and linac geometric impedances, with extension of the existing formulation to include beam acceleration. In our code, we semianalytically solve the linearized Vlasov equation for microbunching amplification factor for an arbitrary linear lattice. In this study we apply our code to beam line lattices of two comparative isochronous recirculation arcs and one arc lattice preceded by a linac section. The resultant microbunching gain functions and spectral responses are presented, with some results compared to particle tracking simulation by elegant (M. Borland, APS Light Source Note No. LS-287, 2002). These results demonstrate clearly the impact of arc lattice design on the microbunching development. The underlying physics with inclusion of those collective effects is elucidated and the limitation of the existing formulation is also discussed.

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  • Received 21 March 2016

DOI:https://doi.org/10.1103/PhysRevAccelBeams.19.114401

Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Accelerators & Beams

Authors & Affiliations

C.-Y. Tsai1,*, D. Douglas2, R. Li1,2, and C. Tennant2

  • 1Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA
  • 2Jefferson Laboratory, Newport News, Virginia 23606, USA

  • *jcytsai@vt.edu

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Issue

Vol. 19, Iss. 11 — November 2016

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