Low emittance electron beam generation from a laser wakefield accelerator using two laser pulses with different wavelengths

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/105152

Title:	Low emittance electron beam generation from a laser wakefield accelerator using two laser pulses with different wavelengths
Authors:	白植豪;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.
Contributors:	理學院物理學系
Keywords:	Carbon dioxide;Carbon dioxide lasers;Coherent light;Color;Electron beams;Electrons;Emittance;Injection lasers;Ionization;Lasers;Light sources;Particle accelerators;Particle beams;Particle in cell technique;Plasma accelerators;Simulation
Date:	2014-06-13
Issue Date:	2026-04-23 12:08:36 (UTC+8)
Publisher:	American Physical Society;College Park: American Physical Society
Abstract:	摘要： 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 10μm 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∼Iλ ) inside the wake, leading to electron beams with very small normalized emittances (tens of nm). Using particle-in-cell simulations we show that a ∼10fs electron beam with ∼4pC of charge and a normalized emittance of ∼50nm can be generated by combining a 10μm 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 (∼30keV , 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. 出版者： College Park: American Physical Society 出版日期： 2014-06-13 出處： Physical review special topics. PRST-AB. Accelerators and beams, 2014-06, Vol.17 (6), p.061301, Article 061301 資源來源： American Physical Society 版權： 2014. This work is licensed under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. 識別號： ISSN: 1098-4402 識別號： EISSN: 1098-4402 識別號： EISSN: 2469-9888 識別號： DOI: 10.1103/PhysRevSTAB.17.061301
Appears in Collections:	[Department of Physics] journal & Dissertation

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