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Title: Adaptive control of laser-wakefield accelerators driven by mid-IR laser pulses

Abstract

There has been growing interest both in studying high intensity ultrafast laser plasma interactions with adaptive control systems as well as using long wavelength driver beams. We demonstrate the coherent control of the dynamics of laser-wakefield acceleration driven by ultrashort (~ 100 fs) mid-infrared (~ 3.9 μm) laser pulses. The critical density at this wavelength is 7.3 × 1019 cm-3, which is achievable with an ordinary gas target system. Interactions between mid-infrared laser pulses and such near-critical-density plasma may be beneficial due to much higher absorption of laser energy. In addition, the normalized vector potential of the laser field a0 increases with longer laser wavelength, lowering the required peak laser intensity to drive non-linear laser-wakefield acceleration. Here, MeV level, collimated electron beams with non-thermal, peaked energy spectra are generated. Optimization of electron beam qualities are realized through adaptive control of the laser wavefront. A genetic algorithm controlling a deformable mirror improves the electron total charge, energy spectra, beam pointing and stability at various plasma density profiles. Particle-in-cell simulations reveal that the optimal wavefront causes an earlier injection on the density up-ramp and thus higher energy gain as well as less filamentation during the interaction, which leads to the improvement inmore » electron beam collimation and energy spectra.« less

Authors:
ORCiD logo; ; ORCiD logo; ORCiD logo; ; ; ; ORCiD logo;
Publication Date:
Research Org.:
Krell Inst., Ames, IA (United States); Univ. of Maryland, College Park, MD (United States); Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); US Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF); Engineering and Physical Sciences Research Council (EPSRC)
OSTI Identifier:
1505638
Alternate Identifier(s):
OSTI ID: 1614434
Grant/Contract Number:  
NA0003864; 0015516; 0016804; SC0015516; SC0016804
Resource Type:
Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Name: Optics Express Journal Volume: 27 Journal Issue: 8; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Optics

Citation Formats

Lin, J., Ma, Y., Schwartz, R., Woodbury, D., Nees, J. A., Mathis, M., Thomas, A. G. R., Krushelnick, K., and Milchberg, H. Adaptive control of laser-wakefield accelerators driven by mid-IR laser pulses. United States: N. p., 2019. Web. doi:10.1364/OE.27.010912.
Lin, J., Ma, Y., Schwartz, R., Woodbury, D., Nees, J. A., Mathis, M., Thomas, A. G. R., Krushelnick, K., & Milchberg, H. Adaptive control of laser-wakefield accelerators driven by mid-IR laser pulses. United States. doi:10.1364/OE.27.010912.
Lin, J., Ma, Y., Schwartz, R., Woodbury, D., Nees, J. A., Mathis, M., Thomas, A. G. R., Krushelnick, K., and Milchberg, H. Thu . "Adaptive control of laser-wakefield accelerators driven by mid-IR laser pulses". United States. doi:10.1364/OE.27.010912.
@article{osti_1505638,
title = {Adaptive control of laser-wakefield accelerators driven by mid-IR laser pulses},
author = {Lin, J. and Ma, Y. and Schwartz, R. and Woodbury, D. and Nees, J. A. and Mathis, M. and Thomas, A. G. R. and Krushelnick, K. and Milchberg, H.},
abstractNote = {There has been growing interest both in studying high intensity ultrafast laser plasma interactions with adaptive control systems as well as using long wavelength driver beams. We demonstrate the coherent control of the dynamics of laser-wakefield acceleration driven by ultrashort (~ 100 fs) mid-infrared (~ 3.9 μm) laser pulses. The critical density at this wavelength is 7.3 × 1019 cm-3, which is achievable with an ordinary gas target system. Interactions between mid-infrared laser pulses and such near-critical-density plasma may be beneficial due to much higher absorption of laser energy. In addition, the normalized vector potential of the laser field a0 increases with longer laser wavelength, lowering the required peak laser intensity to drive non-linear laser-wakefield acceleration. Here, MeV level, collimated electron beams with non-thermal, peaked energy spectra are generated. Optimization of electron beam qualities are realized through adaptive control of the laser wavefront. A genetic algorithm controlling a deformable mirror improves the electron total charge, energy spectra, beam pointing and stability at various plasma density profiles. Particle-in-cell simulations reveal that the optimal wavefront causes an earlier injection on the density up-ramp and thus higher energy gain as well as less filamentation during the interaction, which leads to the improvement in electron beam collimation and energy spectra.},
doi = {10.1364/OE.27.010912},
journal = {Optics Express},
number = 8,
volume = 27,
place = {United States},
year = {2019},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1364/OE.27.010912

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