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Enhancement of electron injection using two auxiliary interfering-pulses in LWFA

Enhancement of electron injection using two auxiliary interfering-pulses in LWFA. Yan Yin ( 银燕 ) Department of Physics National University of Defense Technology. th. NUDT. 5 ASS&S. Outline. Laser Wakefield Accelerator (LWFA) Trapping, Acceleration & Injection of Electrons

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Enhancement of electron injection using two auxiliary interfering-pulses in LWFA

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  1. Enhancement of electron injection using two auxiliary interfering-pulses in LWFA Yan Yin (银燕) Department of Physics National University of Defense Technology th NUDT 5 ASS&S

  2. Outline • Laser Wakefield Accelerator (LWFA) • Trapping, Acceleration & Injection of Electrons • Enhancement of Electron Injection by Using two Auxiliary Interfering-Pulses in LWFA • Stage 1: Moving Electron Density Grating Formation in the Beating Field of Auxiliary Pulses • Stage 2: The Interfering-pulses Auxiliary LWFA (IPA-LWFA) scheme

  3. LWFA: Background & Progress PBWA: E. Esarey, C. B. Schroeder, and W. P. Leemans, Rev.Mod.Phys., 81,001229(2009)

  4. S. P. D. Mangles et al., NATURE, 431, 535, 2004. C. G. R. Geddes et al., NATURE, 431, 538, 2004. J. Faure,Y. Glinec, A. Pukhov et al., NATURE, 431, 541, 2004. J. Faure, C. Rechatin, A. Norlin et al., NATURE, 444, 737, 2006. W. P. Leemans, B. Nagler, A. J. Gonsalves et.al., Nature Phys., 2. 418, 2006. I. Blumenfeld, C. E. Clayton, F. J. Decker et.al., Nature, 445,741, 2007. N. A. M. Hafz, T.M. Jeong, I. W. Choi et.al., Nature Photonics, 2, 571, 2008. H.-P. Schlenvoigt, K. Haupt, A. Debus et.al., 4, 130, 2008. S. F. Martins, R. A. Fonseca, W. Lu et al., NATURE Phys. , 6, 311, 2010. List but a few…..

  5. Trapping & Acceleration of Electrons Dephasing length: • Rayleigh diffraction • Pump depletion, instability, … E. Esarey and M. Pilloff, Phys. Plasmas, 2, 1432 (1995)

  6. Electron boosted Wake slow down Effects limiting acceleration • Dephasing length • Rayleigh diffraction • Pump depletion, beam loading, instability, … How does the election enter the acceleration phase of wakefield?

  7. Injection of Electrons • Self-injection • Optical injection • Ponderomotive injection • Cold optical injection • Ionization injection • Injection by density transition

  8. Self-injection in bubble regime V.Malka et.al., Nature Phys. 4,447(2008) S. Kalmykov et.al., Phys. Rev. Lett., 103, 135004 (2009)

  9. Ponderomotive injection by colliding pulses D. Umstadter, J. K. Kim, and E. Dodd, Phys. Rev. Lett., 76, 2073(1996) E. Esarey et. al., Phys. Rev. Lett., 79, 2682(1997) H. Kotaki et.al., Phys. Plasmas, 11, 3296(2004)

  10. J. Faure, C. Rechatin, A. Norlin et al., Nature, 444, 737, 2006.

  11. H.Kotaki et.al., Phys. Rev. Lett., PRL 103, 194803 (2009)

  12. Cold optical injection by using circularly polarized colliding pulses X. Davoine et.al., Phys. Rev. Lett., 102, 065001(2009)

  13. Enhanced self-injection of electrons by using two auxiliary interfering-pulses in LWFA Auxiliary laser intensity: nonrelativistic ~1016W/cm2

  14. Stage 1 Moving Electron Density Grating Formation in the Beating Field of Auxiliary Pulses

  15. From the set of two-stream fluid equations, the electron density modulation equation is obtained [1]: [1] Z. M. Sheng, J. Zhang and D. Umstadter, Appl. Phys. B 77, 673 (2003).

  16. Standing field Quasi-charge-neutrality Small velocity modulation Z. M. Sheng, J. Zhang and D. Umstadter, Plasma density gratings induced by intersecting laser pulses in underdense plasmas. Appl. Phys. B 77, 673 (2003).

  17. Beating field Especially, when Spatial period: Moving velocity:

  18. 1D PIC simulation: 0 50 150 200

  19. t=140T0

  20. Pre-accelerated electrons are more easily trapped in the wakefield excited by the pump laser Large velocity modulation of electrons

  21. Stage 2 The Interfering-pulses Auxiliary LWFA (IPA-LWFA) scheme

  22. 0 50 150 200 1D PIC simulation: Perpendicularly-polarized

  23. It is the initial status of plasmas when the short intense pump laser is incident.

  24. IPA-LWFA LWFA

  25. 2D PIC simulation

  26. 2D PIC simulation

  27. 2D PIC simulation

  28. 2D PIC simulation

  29. Summary • Efficient injection schemes are desired for electron acceleration • Moving electron density gratings can be generated by two low-intensity interfering pulses • Enhanced self-injection of electrons is obtained in the IPA-LWFA scheme.

  30. Thanks for your attention! 5 ASS&S th NUDT

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