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

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. Here, 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.

Authors:
 [1];  [2]; ORCiD logo [1]; ORCiD logo [1];  [1];  [3];  [3];  [3];  [4];  [5]; ORCiD logo [6];  [7];  [8];  [1]
  1. Univ. of Strathclyde, Glasgow (United Kingdom); Cockcroft Institute, Cheshire (United Kingdom)
  2. Univ. of Strathclyde, Glasgow (United Kingdom); Cockcroft Institute, Cheshire (United Kingdom); Univ. of Hamburg, Hamburg (Germany)
  3. Univ. of Hamburg, Hamburg (Germany)
  4. Univ. of Strathclyde, Glasgow (United Kingdom); Cockcroft Institute, Cheshire (United Kingdom); Univ. of Hamburg, Hamburg (Germany); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  5. Univ. of Strathclyde, Glasgow (United Kingdom); Cockcroft Institute, Cheshire (United Kingdom); Shanghai Jiao Tong Univ., Shanghai (China)
  6. Univ. of Colorado and Tech-X Corp., Boulder, CO (United States)
  7. RadiaSoft, Boulder, CO (United States)
  8. Univ. of California, Los Angeles, CA (United States)
Publication Date:
Research Org.:
RadiaSoft, Boulder, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1389836
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; Plasma-based accelerators; X-rays

Citation Formats

Manahan, Grace G., Habib, A. F., Scherkl, P., Delinikolas, P., Beaton, A., Knetsch, A., Karger, O., Wittig, G., Heinemann, T., Sheng, Z. M., Cary, J. R., Bruhwiler, D. L., Rosenzweig, J. B., and Hidding, Bernhard. Single-stage plasma-based correlated energy spread compensation for ultrahigh 6D brightness electron beams. United States: N. p., 2017. Web. doi:10.1038/ncomms15705.
Manahan, Grace G., Habib, A. F., Scherkl, P., Delinikolas, P., Beaton, A., Knetsch, A., Karger, O., Wittig, G., Heinemann, T., Sheng, Z. M., Cary, J. R., Bruhwiler, D. L., Rosenzweig, J. B., & Hidding, Bernhard. Single-stage plasma-based correlated energy spread compensation for ultrahigh 6D brightness electron beams. United States. doi:10.1038/ncomms15705.
Manahan, Grace G., Habib, A. F., Scherkl, P., Delinikolas, P., Beaton, A., Knetsch, A., Karger, O., Wittig, G., Heinemann, T., Sheng, Z. M., Cary, J. R., Bruhwiler, D. L., Rosenzweig, J. B., and Hidding, Bernhard. Mon . "Single-stage plasma-based correlated energy spread compensation for ultrahigh 6D brightness electron beams". United States. doi:10.1038/ncomms15705. https://www.osti.gov/servlets/purl/1389836.
@article{osti_1389836,
title = {Single-stage plasma-based correlated energy spread compensation for ultrahigh 6D brightness electron beams},
author = {Manahan, Grace G. and Habib, A. F. and Scherkl, P. and Delinikolas, P. and Beaton, A. and Knetsch, A. and Karger, O. and Wittig, G. and Heinemann, T. and Sheng, Z. M. and Cary, J. R. and Bruhwiler, D. L. and Rosenzweig, J. B. and Hidding, Bernhard},
abstractNote = {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. Here, 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.},
doi = {10.1038/ncomms15705},
journal = {Nature Communications},
issn = {2041-1723},
number = ,
volume = 8,
place = {United States},
year = {2017},
month = {6}
}

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Cited by: 7 works
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Figures / Tables:

Figure 1 Figure 1: Beamloading of the plasma wake in 1D nonlinear regime. On-axis longitudinal electric fieldmore » $E$$z$ (blue line) and electrostatic potential $\phi$ (dashed black line) in a plasma wave of density $n$0= 1.1 x 10 17 cm -3, driven by a non-evolving electron beam (red curve), propagating to the right. Adding an electron escort beam (green curve) with charge density $n$$b$ can load the wake and flatten or reverse the electric longitudinal field locally: (a) unloaded case ($n$$b$ = 0), where the position of the witness bunch $n$$w$ (purple curve) and its resulting energy chirp is indicated schematically, (b) $n$$b$/$n$0 = 0.5, (c) $n$$b$/$n$0 = 1.0 and (d) $n$$b$/$n$0 = 1.5. The results are obtained using the 1D nonlinear fluid model description. The electron witness bunch position and size (purple) is indicated, thus visualizing the electric accelerating field which would be sampled by the witness. The insets in (a,d) are the longitudinal phase spaces of the witness bunch, indicating the phase rotation for the (a) unloaded and (d) loaded cases.« less

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      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.