Correction to the Alfvén-Lawson criterion for relativistic electron beams

Dodin, I. Y.; Fisch, Nathaniel J.

doi:10.1063/1.2358970

Cited by 12 publications

(3 citation statements)

References 40 publications

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“…3d) confirms that the electron trajectories are flat. It must be pointed out that the current limit for a beam of relativistic electrons is γJ A [60,61], where γ is the relativistic factor associated with the directed motion. In our simulation, there are electrons with γ > 100 needed to satisfy the criterion J 0 < γJ A [45].…”

mentioning

confidence: 99%

Forward sliding-swing acceleration: electron acceleration by high-intensity lasers in strong plasma magnetic fields

Gong,

Mackenroth,

Wang

et al. 2018

Preprint

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A high-intensity laser beam propagating through a dense plasma drives a strong current that robustly sustains a strong quasi-static Mega Tesla-level azimuthal magnetic field. The transverse laser field efficiently accelerates electrons in such a field that confines the transverse motion and deflects the electrons in the forward direction, establishing the novel forward-sliding swing acceleration mechanism. Its advantage is a threshold rather than resonant behavior, accelerating electrons to high energies for sufficiently strong laser-driven currents. We study the electrons' dynamics by a simplified model analytically, specifically deriving simple relations between the current, the particles' initial transverse momenta and the laser's field strength classifying the energy gain. We confirm the model's predictions by numerical simulations, indicating Mega ampere-level threshold currents and energy gains two orders of magnitude higher than achievable without the magnetic field.

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confidence: 99%

Forward sliding-swing acceleration: electron acceleration by high-intensity lasers in strong plasma magnetic fields

Gong,

Mackenroth,

Wang

et al. 2018

Preprint

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“…The beam current reaches I 134 kA by assuming the pulse length of the electron beam is the same as that of the laser pulse. This is a large fraction of the Alfven current limit [39,40], which in this case is I A = 1.65 × 17[kA] γ 2 − 1 = 262 kA, where γ = 9.4 for the average energy of 5.3 MeV, as shown in Fig. 4c.…”

Section: Resultsmentioning

confidence: 76%

Ultrahigh-charge electron beams from laser-irradiated solid surface

Zhao

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

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SignificanceIn the last three decades, the laser–plasma accelerator (LPA) has shown a rapid development owing to its super–high-accelerate gradients, which makes it a very promising compact accelerator and light source. Acceleration of a high-quality electron beam with divergence angle as small as possible and beam charge as high as possible has been a long-term goal ever since the inception of the LPA concept. However, until now the most popular acceleration scenario has failed to achieve both goals. We solved this problem and obtained tightly collimated electron beams with small divergence angle and extremely high beam charge (∼100 nC) via the powerful ps laser pulse interacting with a solid target.

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“…In the extended phase space, where (t, −H) serves as another canonical pair and the independent variable is the proper time τ , the equivalent Hamiltonian reads [17]…”

Section: Basic Equationsmentioning

confidence: 99%

Ponderomotive acceleration of hot electrons in tenuous plasmas

et al. 2009

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The oscillation-center Hamiltonian is derived for a relativistic electron injected with an arbitrary momentum in a linearly polarized laser pulse propagating in tenuous plasma, assuming that the pulse length is smaller than the plasma wavelength. For hot electrons generated at collisions with ions under intense laser drive, multiple regimes of ponderomotive acceleration are identified and the laser dispersion is shown to affect the process at plasma densities down to 10 17 cm −3 . Assuming a/γg 1, which prevents net acceleration of the cold plasma, it is also shown that the normalized energy γ of hot electrons accelerated from the initial energy γ0 Γ does not exceed Γ ∼ aγg, where a is the normalized laser field, and γg is the group velocity Lorentz factor. Yet γ ∼ Γ is attained within a wide range of initial conditions; hence a cutoff in the hot electron distribution is predicted.

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Correction to the Alfvén-Lawson criterion for relativistic electron beams

Abstract: The Alfvén-Lawson criterion for relativistic electron beams is revised. The parameter range is found, in which a stationary beam can carry arbitrarily large current, regardless of its transverse structure.

Cited by 12 publications

References 40 publications

Forward sliding-swing acceleration: electron acceleration by high-intensity lasers in strong plasma magnetic fields

Forward sliding-swing acceleration: electron acceleration by high-intensity lasers in strong plasma magnetic fields

Ultrahigh-charge electron beams from laser-irradiated solid surface

Ponderomotive acceleration of hot electrons in tenuous plasmas

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