Electron capture and violent acceleration by an extra-intense laser beam

Wang, J. X.; Ho, Y. K.; Kong, Q.; Zhu, Lun-Wu; Liu, Feng; Scheid, S.; Hora, Heinrich

doi:10.1103/physreve.58.6575

Cited by 93 publications

(39 citation statements)

References 15 publications

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“…For a focused laser beam propagating in vacuum, there exists a region characterized by subluminous phase velocity. Based on this feature we are able to propose a novel vacuum laser acceleration 2 scheme, the capture and acceleration scenario (CAS) [12,13]. Previous studies of the CAS found significant energy gains only in the regime of ultra-high intensities a 0 100 when kw 0 > 170, where a 0 = eE 0 /(mωc) = 8.5 × 10 −10 λI 1/2 with λ the laser wavelength in µm, I the intensity in W/cm 2 , E 0 the electric field amplitude of the laser beam at focus, ω = ck = 2πc/λ the laser frequency, and w 0 the beam width at focus.…”

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confidence: 99%

Subluminous phase velocity of a focused laser beam and vacuum laser acceleration

Pang

Yuan

et al. 2002

Phys. Rev. E

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Abstract. It has been found that for a focused laser beam propagating in free-space, there exists, surrounding the laser beam axis, a subluminous wave phase velocity region.Relativistic electrons injected into this region can be trapped in the acceleration phase and remain in phase with the laser field for sufficiently long times, thereby receiving considerable energy from the field. Optics placed near the laser focus are not necessary, thus allowing high intensities and large energy gains. Important features of this process are examined via test particle simulations. The resulting energy gains are in agreement with theoretical estimates based on acceleration by the axial laser field.

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confidence: 99%

Subluminous phase velocity of a focused laser beam and vacuum laser acceleration

Pang

Yuan

et al. 2002

Phys. Rev. E

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“…The other option is for the electron to spend a longer time period in the laser field. This is best achieved via a capture and acceleration scenario (CAS) [24][25][26] where the electron enters the field and gets captured near the focus and subsequently accelerated. For such a situation to occur we should have a high energy electron interacting with the laser pulse in a same direction (or near same direction) collision.…”

Section: The Set-upmentioning

confidence: 99%

Radiation damping in pulsed Gaussian beams

Harvey

Marklund

2012

Phys. Rev. A

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We consider the effects of radiation damping on the electron dynamics in a Gaussian beam model of a laser field. For high intensities, i.e. with dimensionless intensity a 0 1, it is found that the dynamics divide into three regimes. For low energy electrons (low initial γ-factor, γ 0 ) the radiation damping effects are negligible. At higher energies, but still at 2γ 0 < a 0 , the damping alters the final displacement and the net energy change of the electron. For 2γ 0 > a 0 one is in a regime of radiation reaction induced electron capture. This capture is found to be stable with respect to the spatial properties of the electron beam and results in a significant energy loss of the electrons. In this regime the plane wave model of the laser field provides a good description of the dynamics, whereas for lower energies the Gaussian beam and plane wave models differ significantly. Finally the dynamics are considered for the case of an XFEL field. It is found that the significantly lower intensities of such fields inhibits the damping effects.

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“…The first clear experimental demonstration of this type of acceleration was by Malka et al (1997), where the identical theoretical formulations of that by Scheid and Hora (1989) were demonstrated. Recently, it has also been found by numerical simulation that the electron can be captured and violently accelerated by an extra-intense laser beam with Q 0 > ∼ 100 (Q 0 = eE 0 /m e ωc) (Wang et al 1998), which is a breakthrough in laser-driven electron acceleration in a vacuum, and is of potential interest to far-field laser acceleration.…”

Section: Introductionmentioning

confidence: 99%