Single-stage plasma-based correlated energy spread compensation for ultrahigh 6D brightness electron beams

G. G. Manahan (), A. F. Habib, P. Scherkl, P. Delinikolas, A. Beaton, A. Knetsch, O. Karger, G. Wittig, T. Heinemann, Z. M. Sheng, J. R. Cary, D. L. Bruhwiler, J. B. Rosenzweig and B. Hidding ()
Additional contact information
G. G. Manahan: Scottish Universities Physics Alliance, University of Strathclyde, Glasgow G4 0NG, UK
A. F. Habib: Scottish Universities Physics Alliance, University of Strathclyde, Glasgow G4 0NG, UK
P. Scherkl: Scottish Universities Physics Alliance, University of Strathclyde, Glasgow G4 0NG, UK
P. Delinikolas: Scottish Universities Physics Alliance, University of Strathclyde, Glasgow G4 0NG, UK
A. Beaton: Scottish Universities Physics Alliance, University of Strathclyde, Glasgow G4 0NG, UK
A. Knetsch: University of Hamburg, Hamburg 22761, Germany
O. Karger: University of Hamburg, Hamburg 22761, Germany
G. Wittig: University of Hamburg, Hamburg 22761, Germany
T. Heinemann: Scottish Universities Physics Alliance, University of Strathclyde, Glasgow G4 0NG, UK
Z. M. Sheng: Scottish Universities Physics Alliance, University of Strathclyde, Glasgow G4 0NG, UK
J. R. Cary: Center for Integrated Plasma Studies, University of Colorado Boulder and Tech-X Corporation, Boulder, Colorado 80303, USA
D. L. Bruhwiler: RadiaSoft LLC, Boulder, Colorado 80304, USA
J. B. Rosenzweig: Particle Beam Physics Laboratory, University of California, Los Angeles, California 90095, USA
B. Hidding: Scottish Universities Physics Alliance, University of Strathclyde, Glasgow G4 0NG, UK

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract Plasma photocathode wakefield acceleration combines energy gains of tens of GeV m−1 with generation of ultralow emittance electron bunches, and opens a path towards 5D-brightness orders of magnitude larger than state-of-the-art. This holds great promise for compact accelerator building blocks and advanced light sources. However, an intrinsic by-product of the enormous electric field gradients inherent to plasma accelerators is substantial correlated energy spread—an obstacle for key applications such as free-electron-lasers. Here we show that by releasing an additional tailored escort electron beam at a later phase of the acceleration, when the witness bunch is relativistically stable, the plasma wave can be locally overloaded without compromising the witness bunch normalized emittance. This reverses the effective accelerating gradient, and counter-rotates the accumulated negative longitudinal phase space chirp of the witness bunch. Thereby, the energy spread is reduced by an order of magnitude, thus enabling the production of ultrahigh 6D-brightness beams.

Date: 2017
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DOI: 10.1038/ncomms15705

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