Single Shot Characterization of High Transformer Ratio Wakefields in Nonlinear Plasma Acceleration

Roussel, R.; Andonian, G.; Lynn, W.; Sanwalka, K.; Robles, R.; Hansel, C.; Deng, A.; Lawler, G.; Rosenzweig, J. B.; Ha, G.; Seok, J.; Power, J. G.; Conde, M.; Wisniewski, E.; Doran, D. S.; Whiteford, C. E.

doi:10.1103/PhysRevLett.124.044802

Title: Single Shot Characterization of High Transformer Ratio Wakefields in Nonlinear Plasma Acceleration

Journal Article · 31 January 2020 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.124.044802 · OSTI ID:1597566

^[1]; Andonian, G. ^[1]; Lynn, W. ^[1];

^[1]; Robles, R. ^[1];

^[1]; Deng, A. ^[1]; Lawler, G. ^[1]; Rosenzweig, J. B. ^[1];

^[2]; Seok, J. ^[2]; Power, J. G. ^[2]; Conde, M. ^[2];

^[2]; Doran, D. S. ^[2]; Whiteford, C. E. ^[2]

Univ. of California, Los Angeles, CA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

We report that plasma wakefields can enable very high accelerating gradients for frontier high energy particle accelerators, in excess of 10 GeV/m. To overcome limits on single stage acceleration, specially shaped drive beams can be used in both linear and nonlinear plasma wakefield accelerators (PWFA), to increase the transformer ratio, implying that the drive beam deceleration is minimized relative to acceleration obtained in the wake. In this Letter, we report the results of a nonlinear PWFA, high transformer ratio experiment using high-charge, longitudinally asymmetric drive beams in a plasma cell. An emittance exchange process is used to generate variable drive current profiles, in conjunction with a long (multiple plasma wavelength) witness beam. The witness beam is energy modulated by the wakefield, yielding a response that contains detailed spectral information in a single-shot measurement. Using these methods, we generate a variety of beam profiles and characterize the wakefields, directly observing transformer ratios up to R=7.8. Lastly, a spectrally based reconstruction technique, validated by 3D particle-in-cell simulations, is introduced to obtain the drive beam current profile from the decelerating wake data.

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Research Organization:: Univ. of California, Los Angeles, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0017648; AC02-06CH11357

OSTI ID:: 1597566

Alternate ID(s):: OSTI ID: 1616526

Report Number(s):: APS/123-QED; PRLTAO; TRN: US2103142

Journal Information:: Physical Review Letters, Vol. 124, Issue 4; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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