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

Abstract

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.

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [2];  [2];  [2];  [2]; ORCiD logo [2];  [2];  [2]
+ Show Author Affiliations
  1. Univ. of California, Los Angeles, CA (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Univ. of California, Los Angeles, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1597566
Alternate Identifier(s):
OSTI ID: 1616526
Report Number(s):
APS/123-QED
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:  
SC0017648; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 124; Journal Issue: 4; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; Beam control; Plasma acceleration & new acceleration techniques

Citation Formats

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., and Whiteford, C. E. Single Shot Characterization of High Transformer Ratio Wakefields in Nonlinear Plasma Acceleration. United States: N. p., 2020. Web. https://doi.org/10.1103/PhysRevLett.124.044802.
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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. Single Shot Characterization of High Transformer Ratio Wakefields in Nonlinear Plasma Acceleration. United States. https://doi.org/10.1103/PhysRevLett.124.044802
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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., and Whiteford, C. E. Fri . "Single Shot Characterization of High Transformer Ratio Wakefields in Nonlinear Plasma Acceleration". United States. https://doi.org/10.1103/PhysRevLett.124.044802. https://www.osti.gov/servlets/purl/1597566.
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@article{osti_1597566,
title = {Single Shot Characterization of High Transformer Ratio Wakefields in Nonlinear Plasma Acceleration},
author = {Roussel, R. and Andonian, G. and Lynn, W. and Sanwalka, K. and Robles, R. and Hansel, C. and Deng, A. and Lawler, G. and Rosenzweig, J. B. and Ha, G. and Seok, J. and Power, J. G. and Conde, M. and Wisniewski, E. and Doran, D. S. and Whiteford, C. E.},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.124.044802},
journal = {Physical Review Letters},
number = 4,
volume = 124,
place = {United States},
year = {2020},
month = {1}
}
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