Characterization of laser wakefield acceleration efficiency with octave spanning near-IR spectrum measurements

Streeter, M.J.V. and Ma, Y. and Kettle, B. and Dann, S.J.D. and Gerstmayr, E. and Albert, F. and Bourgeois, N. and Cipiccia, S. and Cole, J.M. and Gallardo González, I. and Hussein, A.E. and Jaroszynski, D.A. and Falk, K. and Krushelnick, K. and Lemos, N. and Lopes, N.C. and Lumsdon, C. and Lundh, O. and Mangles, S.P.D. and Najmudin, Z. and Rajeev, P.P. and Sandberg, R. and Shahzad, M. and Smid, M. and Spesyvtsev, R. and Symes, D.R. and Vieux, G. and Thomas, A.G.R. (2022) Characterization of laser wakefield acceleration efficiency with octave spanning near-IR spectrum measurements. Physical Review Accelerators and Beams, 25 (10). ISSN 2469-9888

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We report on experimental measurements of energy transfer efficiencies in a GeV-class laser wakefield accelerator. Both the transfer of energy from the laser to the plasma wakefield and from the plasma to the accelerated electron beam was diagnosed by simultaneous measurement of the deceleration of laser photons and the acceleration of electrons as a function of plasma length. The extraction efficiency, which we define as the ratio of the energy gained by the electron beam to the energy lost by the self-guided laser mode, was maximized at 19±3% by tuning the plasma density and length. The additional information provided by the octave-spanning laser spectrum measurement allows for independent optimization of the plasma efficiency terms, which is required for the key goal of improving the overall efficiency of laser wakefield accelerators.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review Accelerators and Beams
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Export Date: 23 November 2022 Funding details: National Science Foundation, NSF, 1804463 Funding details: U.S. Department of Energy, USDOE, SCW1575-1 Funding details: Air Force Office of Scientific Research, AFOSR, FA9550-16-1-0121 Funding details: Cockcroft Institute, ST/P000835/1, ST/P002021/1, ST/V001639/1 Funding details: Horizon 2020 Framework Programme, H2020, 871124 Funding details: Engineering and Physical Sciences Research Council, EPSRC, EP/J018171/1, EP/N028694/1 Funding details: Science and Technology Facilities Council, STFC, ST/P002056/1 Funding text 1: We acknowledge support from the UK STFC core Grants No. ST/P002056/1 (Cockcroft Institute), No. ST/P000835/1, No. ST/P002021/1, and No. ST/V001639/1 (John Adams Institute), UK EPSRC (EP/J018171/1, EP/N028694/1), the European Union’s Horizon 2020 research and innovation programme under grant agreement Laserlab-Europe (871124), the National Science Foundation (Grant No. 1804463) and the Air Force Office of Scientific Research (Grant No. FA9550-16-1-0121). F. A. acknowledges funding from the DOE Early Career research program (Fusion Energy Sciences SCW1575-1).
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30 Nov 2022 14:35
Last Modified:
21 Sep 2023 03:21