Stimulated Raman backscattering from a laser wakefield accelerator

Hussein, A. E.; Ludwig, J.; Behm, K.; Horovitz, Y.; Masson-Laborde, P-E; Chvykov, V.; Maksimchuk, A.; Matsuoka, T.; McGuffey, C.; Yanovsky, V.; Rozmus, W.; Krushelnick, K.

doi:10.1088/1367-2630/aaceeb

Title: Stimulated Raman backscattering from a laser wakefield accelerator

Abstract

Experiments were performed using the HERCULES laser system at the University of Michigan to study backward stimulated Raman scattering (BSRS) from a laser wakefield accelerator driven with a 30 fs pulse. 'The spectrum of backscattered light was found to be significantly broadened and red-shifted in cases where electrons were accelerated. BSRS broadening (red-shifting) was found to increase with respect to both plasma density and accelerated electron charge for laser powers exceeding 100 TW. Two-dimensional Particle-in-Cell simulations reveal temporal dynamics for the BSRS emission, which ceases as the wakefield bubble is evacuated of plasma electrons because of relativistic self-focusing. The intensity and duration of the BSRS signal was found to vary with plasma density and laser intensity. Both experimental and simulation results indicate that backward SRS is associated with plasma electron density within the wakefield bubble. This measurement can serve as a diagnostic of bubble dynamics, and is correlated with trapped electron charge in this regime.

Authors:

; Ludwig, J.; Behm, K.; Horovitz, Y.; Masson-Laborde, P-E; Chvykov, V.; Maksimchuk, A.; Matsuoka, T.; McGuffey, C.; Yanovsky, V.; Rozmus, W.;

Publication Date:: Sun Jul 01 00:00:00 EDT 2018

Research Org.:: Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1460905

Alternate Identifier(s):: OSTI ID: 1500049

Grant/Contract Number:: NA 0002372; NA0002372

Resource Type:: Published Article

Journal Name:: New Journal of Physics

Additional Journal Information:: Journal Name: New Journal of Physics Journal Volume: 20 Journal Issue: 7; Journal ID: ISSN 1367-2630

Publisher:: IOP Publishing

Country of Publication:: United Kingdom

Language:: English

Subject:: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats


                    Hussein, A. E., Ludwig, J., Behm, K., Horovitz, Y., Masson-Laborde, P-E, Chvykov, V., Maksimchuk, A., Matsuoka, T., McGuffey, C., Yanovsky, V., Rozmus, W., and Krushelnick, K. Stimulated Raman backscattering from a laser wakefield accelerator.  United Kingdom: N. p., 2018. 
Web.  doi:10.1088/1367-2630/aaceeb.

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                    Hussein, A. E., Ludwig, J., Behm, K., Horovitz, Y., Masson-Laborde, P-E, Chvykov, V., Maksimchuk, A., Matsuoka, T., McGuffey, C., Yanovsky, V., Rozmus, W., & Krushelnick, K. Stimulated Raman backscattering from a laser wakefield accelerator.  United Kingdom.  https://doi.org/10.1088/1367-2630/aaceeb

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                    Hussein, A. E., Ludwig, J., Behm, K., Horovitz, Y., Masson-Laborde, P-E, Chvykov, V., Maksimchuk, A., Matsuoka, T., McGuffey, C., Yanovsky, V., Rozmus, W., and Krushelnick, K. Sun .  
"Stimulated Raman backscattering from a laser wakefield accelerator".  United Kingdom.  https://doi.org/10.1088/1367-2630/aaceeb.

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@article{osti_1460905,

  title        = {Stimulated Raman backscattering from a laser wakefield accelerator},

  author       = {Hussein, A. E. and Ludwig, J. and Behm, K. and Horovitz, Y. and Masson-Laborde, P-E and Chvykov, V. and Maksimchuk, A. and Matsuoka, T. and McGuffey, C. and Yanovsky, V. and Rozmus, W. and Krushelnick, K.},

  abstractNote = {Experiments were performed using the HERCULES laser system at the University of Michigan to study backward stimulated Raman scattering (BSRS) from a laser wakefield accelerator driven with a 30 fs pulse. 'The spectrum of backscattered light was found to be significantly broadened and red-shifted in cases where electrons were accelerated. BSRS broadening (red-shifting) was found to increase with respect to both plasma density and accelerated electron charge for laser powers exceeding 100 TW. Two-dimensional Particle-in-Cell simulations reveal temporal dynamics for the BSRS emission, which ceases as the wakefield bubble is evacuated of plasma electrons because of relativistic self-focusing. The intensity and duration of the BSRS signal was found to vary with plasma density and laser intensity. Both experimental and simulation results indicate that backward SRS is associated with plasma electron density within the wakefield bubble. This measurement can serve as a diagnostic of bubble dynamics, and is correlated with trapped electron charge in this regime.},

  doi          = {10.1088/1367-2630/aaceeb},

  journal      = {New Journal of Physics},

  number       = 7,

  volume       = 20,

  place        = {United Kingdom},

  year         = {Sun Jul 01 00:00:00 EDT 2018},

  month        = {Sun Jul 01 00:00:00 EDT 2018}

}

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Figure 1.: A schematic of Backward Stimulated Raman Scattering (BSRS within a laser wakefield plasma bubble. The relativistic plasma wavelength is given by λ_p. The interference of forward going laser light and backward propagating SRS can give rise to a beat structure on the laser wave packet.

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