Cold optical injection producing monoenergetic, multi-GeV electron bunches
A cold optical injection mechanism for a laser-plasma accelerator is described. It relies on a short, circularly polarized, low-energy laser pulse counterpropagating to and colliding with a circularly polarized main pulse in a low density plasma. Contrary to previously published optical injection sc...
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| Veröffentlicht in: | Physical review letters 2009-02, Vol.102 (6), p.065001-065001, Article 065001 |
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| container_title | Physical review letters |
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| creator | Davoine, X Lefebvre, E Rechatin, C Faure, J Malka, V |
| description | A cold optical injection mechanism for a laser-plasma accelerator is described. It relies on a short, circularly polarized, low-energy laser pulse counterpropagating to and colliding with a circularly polarized main pulse in a low density plasma. Contrary to previously published optical injection schemes, injection is not caused here by electron heating. Instead, the collision between the pulses creates a spatially periodic and time-independent beat force. This force can block the longitudinal electron motion, leading to their entry and injection into the propagating wake. In a specific setup, we compute after acceleration over 0.6 mm, a 60 MeV, 50 pC electron bunch with 0.7 MeV rms energy spread, proving the interest of this scheme to inject electron bunches with a narrow absolute energy spread. Acceleration to 3 GeV with a rms spread smaller than 1% is computed after propagation over 3.8 cm in a plasma channel. |
| doi_str_mv | 10.1103/physrevlett.102.065001 |
| format | Article |
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It relies on a short, circularly polarized, low-energy laser pulse counterpropagating to and colliding with a circularly polarized main pulse in a low density plasma. Contrary to previously published optical injection schemes, injection is not caused here by electron heating. Instead, the collision between the pulses creates a spatially periodic and time-independent beat force. This force can block the longitudinal electron motion, leading to their entry and injection into the propagating wake. In a specific setup, we compute after acceleration over 0.6 mm, a 60 MeV, 50 pC electron bunch with 0.7 MeV rms energy spread, proving the interest of this scheme to inject electron bunches with a narrow absolute energy spread. 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It relies on a short, circularly polarized, low-energy laser pulse counterpropagating to and colliding with a circularly polarized main pulse in a low density plasma. Contrary to previously published optical injection schemes, injection is not caused here by electron heating. Instead, the collision between the pulses creates a spatially periodic and time-independent beat force. This force can block the longitudinal electron motion, leading to their entry and injection into the propagating wake. In a specific setup, we compute after acceleration over 0.6 mm, a 60 MeV, 50 pC electron bunch with 0.7 MeV rms energy spread, proving the interest of this scheme to inject electron bunches with a narrow absolute energy spread. 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| identifier | ISSN: 0031-9007 |
| ispartof | Physical review letters, 2009-02, Vol.102 (6), p.065001-065001, Article 065001 |
| issn | 0031-9007 1079-7114 |
| language | eng |
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| source | American Physical Society Journals |
| subjects | ACCELERATION BEAM BUNCHING BEAM INJECTION CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ELECTRON BEAMS GEV RANGE 01-10 Optics PERIODICITY Physics PLASMA PLASMA DENSITY PLASMA GUNS PULSES |
| title | Cold optical injection producing monoenergetic, multi-GeV electron bunches |
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