Low emittance electron beam generation from a laser wakefield accelerator using two laser pulses with different wavelengths. Xu, X., Wu, Y., Zhang, C., Li, F., Wan, Y., Hua, J., Pai, C., Lu, W., Yu, P., Joshi, C., & Mori, W. Physical Review Special Topics - Accelerators and Beams, 17(6):061301, June, 2014. ![Low emittance electron beam generation from a laser wakefield accelerator using two laser pulses with different wavelengths [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Ionization injection triggered by short wavelength laser pulses inside a nonlinear wakefield driven by a longer wavelength laser is examined via multidimensional particle-in-cell simulations. We find that very bright electron beams can be generated through this two-color scheme in either collinear propagating or transverse colliding geometry. For a fixed laser intensity I, lasers with longer/shorter wavelength λ have larger/smaller ponderomotive potential (∝Iλ2). The two-color scheme utilizes this property to separate the injection process from the wakefield excitation process. Very strong wakes can be generated at relatively low laser intensities by using a longer wavelength laser driver (e.g., a 10 μm CO2 laser) due to its very large ponderomotive potential. On the other hand, a short wavelength laser can produce electrons with very small residual momenta (p⊥∼a0∼I√λ) inside the wake, leading to electron beams with very small normalized emittances (tens of nm). Using particle-in-cell simulations we show that a ∼10 fs electron beam with ∼4 pC of charge and a normalized emittance of ∼50 nm can be generated by combining a 10 μm driving laser with a 400 nm injection laser, which is an improvement of more than 1 order of magnitude compared to the typical results obtained when a single wavelength laser is used for both the wake formation and ionization injection. With the transverse colliding geometry, simulations show that similarly low emittance and much lower slice energy spread (∼30 keV, comparing with the typical value of few MeV in the longitudinal injection scheme) can be simultaneously obtained for electron beams with a few pC charge. Such low slice energy spread may have significant advantages in applications relevant to future coherent light sources driven by plasma accelerators.
@article{ xu_low_2014,
title = {Low emittance electron beam generation from a laser wakefield accelerator using two laser pulses with different wavelengths},
volume = {17},
url = {http://link.aps.org/doi/10.1103/PhysRevSTAB.17.061301},
doi = {10.1103/PhysRevSTAB.17.061301},
abstract = {Ionization injection triggered by short wavelength laser pulses inside a nonlinear wakefield driven by a longer wavelength laser is examined via multidimensional particle-in-cell simulations. We find that very bright electron beams can be generated through this two-color scheme in either collinear propagating or transverse colliding geometry. For a fixed laser intensity I, lasers with longer/shorter wavelength λ have larger/smaller ponderomotive potential (∝Iλ2). The two-color scheme utilizes this property to separate the injection process from the wakefield excitation process. Very strong wakes can be generated at relatively low laser intensities by using a longer wavelength laser driver (e.g., a 10 μm {CO}2 laser) due to its very large ponderomotive potential. On the other hand, a short wavelength laser can produce electrons with very small residual momenta (p⊥∼a0∼I√λ) inside the wake, leading to electron beams with very small normalized emittances (tens of nm). Using particle-in-cell simulations we show that a ∼10 fs electron beam with ∼4 {pC} of charge and a normalized emittance of ∼50 nm can be generated by combining a 10 μm driving laser with a 400 nm injection laser, which is an improvement of more than 1 order of magnitude compared to the typical results obtained when a single wavelength laser is used for both the wake formation and ionization injection. With the transverse colliding geometry, simulations show that similarly low emittance and much lower slice energy spread (∼30 {keV}, comparing with the typical value of few {MeV} in the longitudinal injection scheme) can be simultaneously obtained for electron beams with a few {pC} charge. Such low slice energy spread may have significant advantages in applications relevant to future coherent light sources driven by plasma accelerators.},
number = {6},
urldate = {2014-10-15TZ},
journal = {Physical Review Special Topics - Accelerators and Beams},
author = {Xu, X. L. and Wu, Y. P. and Zhang, C. J. and Li, F. and Wan, Y. and Hua, J. F. and Pai, C.-H. and Lu, W. and Yu, P. and Joshi, C. and Mori, W. B.},
month = {June},
year = {2014},
keywords = {emittance, laser},
pages = {061301}
}
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Very strong wakes can be generated at relatively low laser intensities by using a longer wavelength laser driver (e.g., a 10 μm CO2 laser) due to its very large ponderomotive potential. On the other hand, a short wavelength laser can produce electrons with very small residual momenta (p⊥∼a0∼I√λ) inside the wake, leading to electron beams with very small normalized emittances (tens of nm). Using particle-in-cell simulations we show that a ∼10 fs electron beam with ∼4 pC of charge and a normalized emittance of ∼50 nm can be generated by combining a 10 μm driving laser with a 400 nm injection laser, which is an improvement of more than 1 order of magnitude compared to the typical results obtained when a single wavelength laser is used for both the wake formation and ionization injection. With the transverse colliding geometry, simulations show that similarly low emittance and much lower slice energy spread (∼30 keV, comparing with the typical value of few MeV in the longitudinal injection scheme) can be simultaneously obtained for electron beams with a few pC charge. Such low slice energy spread may have significant advantages in applications relevant to future coherent light sources driven by plasma accelerators.","author":["Xu, X. L.","Wu, Y. P.","Zhang, C. J.","Li, F.","Wan, Y.","Hua, J. F.","Pai, C.-H.","Lu, W.","Yu, P.","Joshi, C.","Mori, W. B."],"author_short":["Xu, X.","Wu, Y.","Zhang, C.","Li, F.","Wan, Y.","Hua, J.","Pai, C.","Lu, W.","Yu, P.","Joshi, C.","Mori, W."],"bibtex":"@article{ xu_low_2014,\n title = {Low emittance electron beam generation from a laser wakefield accelerator using two laser pulses with different wavelengths},\n volume = {17},\n url = {http://link.aps.org/doi/10.1103/PhysRevSTAB.17.061301},\n doi = {10.1103/PhysRevSTAB.17.061301},\n abstract = {Ionization injection triggered by short wavelength laser pulses inside a nonlinear wakefield driven by a longer wavelength laser is examined via multidimensional particle-in-cell simulations. We find that very bright electron beams can be generated through this two-color scheme in either collinear propagating or transverse colliding geometry. For a fixed laser intensity I, lasers with longer/shorter wavelength λ have larger/smaller ponderomotive potential (∝Iλ2). The two-color scheme utilizes this property to separate the injection process from the wakefield excitation process. Very strong wakes can be generated at relatively low laser intensities by using a longer wavelength laser driver (e.g., a 10 μm {CO}2 laser) due to its very large ponderomotive potential. On the other hand, a short wavelength laser can produce electrons with very small residual momenta (p⊥∼a0∼I√λ) inside the wake, leading to electron beams with very small normalized emittances (tens of nm). Using particle-in-cell simulations we show that a ∼10 fs electron beam with ∼4 {pC} of charge and a normalized emittance of ∼50 nm can be generated by combining a 10 μm driving laser with a 400 nm injection laser, which is an improvement of more than 1 order of magnitude compared to the typical results obtained when a single wavelength laser is used for both the wake formation and ionization injection. With the transverse colliding geometry, simulations show that similarly low emittance and much lower slice energy spread (∼30 {keV}, comparing with the typical value of few {MeV} in the longitudinal injection scheme) can be simultaneously obtained for electron beams with a few {pC} charge. Such low slice energy spread may have significant advantages in applications relevant to future coherent light sources driven by plasma accelerators.},\n number = {6},\n urldate = {2014-10-15TZ},\n journal = {Physical Review Special Topics - Accelerators and Beams},\n author = {Xu, X. L. and Wu, Y. P. and Zhang, C. J. and Li, F. and Wan, Y. and Hua, J. F. and Pai, C.-H. and Lu, W. and Yu, P. and Joshi, C. and Mori, W. 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