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Narrow energy spread, GeV electron beams from shock injection in a laser wakefield accelerator

This study investigates the generation of highly reproducible electron beams with narrow energy spreads using shock injection in a laser wakefield accelerator. The experimental apparatus achieved high-energy beams with low energy spread and high charge. Potential applications include radiation reaction experiments and monoenergetic radiation sources for Thomson scattering.

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Narrow energy spread, GeV electron beams from shock injection in a laser wakefield accelerator

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  1. Narrow energy spread, GeV electron beams from shock injection in a laser wakefield accelerator Cary Colgan EAAC 2019

  2. 1N. Bourgeois, 1P.P. Rajeev, 1D.R. Symes 2J.M. Cole, 2C. Colgan, 2E. Gerstmayr, 2B. Kettle, 2E. Los, 2M.J.V Streeter,2Z. Najmudin, 2S.P.D. Mangles 3G. Sarri, 3G.M. Samarin, 3A. Alejo, 4M. Zepf, 4C. Roedel, 4D. Hollatz, 4Harsh, 4F. Salgado, 5C.D. Murphy, 5C.D. Baird, 5C.I.D. Underwood, 5C.P. Ridgers, 5C. Arran 6J.A. Cardarelli, 6M. Balcazar, 6A.G.R. Thomas, 7M. Marklund, 7T.G. Blackburn 1 Central Laser Facility, STFC Rutherford Appleton Laboratories 2 John Adams Institute for Accelerator Science, Imperial College London 3 School of Maths and Physics, The Queens University of Belfast 4 Institut f ̈ur Optik und Quantenelektronik, Friedrich-Schiller-Universit ̈at 5 York Plasma Institute, University of York 6 Center for Ultrafast Optical Science, University of Michigan 7 Department of Physics, Chalmers University Acknowledgements

  3. Self injection Electron beam properties from LWFA highly dependent on injection process Poder et al., PRX 8.031004, (2018) Kneip et al., PRSTAB 15.021302, (2012)

  4. Ionisation injection Localised injection Continuous injection Electron beam properties from LWFA highly dependent on injection process Clayton et al., PRL 105.105003, (2010) Pollock, et al., PRL, 107(4), 045001, (2011)

  5. Down-ramp injection Electron beam properties from LWFA highly dependent on injection process Schmid, K., et al., PRSTAB 13(9), 091301. (2010)

  6. Can we scale up downramp injection to the GeV energy scale? Comparing single laser injection methods

  7. Simulating down-ramp Injection with 165 TW laser

  8. Gemini Laser: 11 J, 42 fs a_0 2.9 F/40 focusing ⌀ 15 mm Shock created by blade in gas jet

  9. Narrow energy spread GeV beams

  10. Narrow energy spread GeV beams Deconvolved

  11. Sensitivity to shock position in this regime Blade out Blade in Blade further in

  12. Sensitivity to shock position in this regime Swanson et al., PRAB, (2017) Wenz et al., NatPhot, (2019) Tsai et al.,PoP, (2018)

  13. Cole et al., PRX, (2018) Application to a radiation reaction experiment • Previous radiation reaction study of shock injected LWFA electrons • With these beams we could discriminate different models through increase in energy spread

  14. Shock injection has been used to generate reproducible electron beams with high energy feature • High energy: 1.11 ± 0.06 GeV • Low energy spread: 6 (2) ± 1% FWHM • High charge: 30 ± 8 pC in FWHM • Robust experimental apparatus achieved beams on multiple occasions, but sensitive to shock parameters. • Radiation reaction experiments with these beams could be capable of differentiating theoretical models with ~ 10 shots. • Other applications to monoenergetic radiation sources for Thomson scattering. THIS WORK Conclusion

  15. Laser Blade Gas Nozzle

  16. Reference

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