Self-resonant wakefield excitation by intense laser pulse in plasmas

Andreev, N. E.; Gorbunov, L. M.; Kirsanov, V. I.; Pogosova, A. A.; Ramazashvili, Revaz

doi:10.1109/plasma.1993.593503

Cited by 36 publications

(39 citation statements)

References 2 publications

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“…Actually, the laser pulse etching (see consideration of this effect in § 2.5 below) and the laser pulse self-modulation (Andreev et al 1992;Antonsen & Mora 1992;Sprangle et al 1992;Bulanov et al 1996) will result in a change of the laser pulse length, amplitude and form, eventually leading to the appearance of a final amplitude wake wave in the plasma behind the laser pulse and to laser pulse energy depletion.…”

Section: 3mentioning

confidence: 99%

On some theoretical problems of laser wake-field accelerators

et al. 2016

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Enhancement of the quality of laser wake-field accelerated (LWFA) electron beams implies the improvement and controllability of the properties of the wake waves generated by ultra-short pulse lasers in underdense plasmas. In this work we present a compendium of useful formulas giving relations between the laser and plasma target parameters allowing one to obtain basic dependences, e.g. the energy scaling of the electrons accelerated by the wake field excited in inhomogeneous media including multi-stage LWFA accelerators. Consideration of the effects of using the chirped laser pulse driver allows us to find the regimes where the chirp enhances the wake field amplitude. We present an analysis of the three-dimensional effects on the electron beam loading and on the unlimited LWFA acceleration in inhomogeneous plasmas. Using the conditions of electron trapping to the wake-field acceleration phase we analyse the multi-equal stage and multiuneven stage LWFA configurations. In the first configuration the energy of fast electrons is a linear function of the number of stages, and in the second case, the accelerated electron energy grows exponentially with the number of stages. The results of the two-dimensional particle-in-cell simulations presented here show the high quality electron acceleration in the triple stage injection-acceleration configuration.

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Section: 3mentioning

confidence: 99%

On some theoretical problems of laser wake-field accelerators

et al. 2016

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“…p0 30). The channel radius is matched with the initial laser spot size by the linear condition [27] R ch k p0 r 2 L ; (20) which in the case of the electron density profile, Eq. (19), provides guided propagation of a Gaussian laser pulse without substantial distortion for a moderate laser power, P L =P c 1 (where P c is the critical power for relativistic self-focusing in a plasma, P c 17 !…”

Section: Model Predictionsmentioning

confidence: 99%

“…On the other hand, self-modulated LWFA [11][12][13][14][15][16][17][18][19][20] normally requires laser pulse lengths substantially longer than 2 ps. Longer pulses allow the wake to grow via Raman forward scattering or a resonant modulation instability within the laser pulse envelope.…”

Section: Introductionmentioning

confidence: 99%

Modeling of laser wakefield acceleration atCO2laser wavelengths

Andreev

Kuznetsov

Pogosova

et al. 2003

Phys. Rev. ST Accel. Beams

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The upgraded Accelerator Test Facility (ATF) CO 2 laser located at Brookhaven National Laboratory offers a unique opportunity to investigate laser wakefield acceleration (LWFA) with a 10:6-m laser, a wavelength where little experimental work exists. While long laser wavelengths have certain advantages over short wavelengths, our modeling analysis has uncovered another important effect. The upgraded ATF CO 2 laser will have a pulse length as short as 2 ps. At a nominal plasma density of 10 16 cm ÿ3 , this pulse length would normally be considered too long for resonant LWFA, but too short for self-modulated LWFA. However, our model simulations indicate that a well-formed wakefield is nevertheless generated with electric field gradients of E z * 2 GV=m assuming 2.5 TW laser peak power. The model indicates pulse steepening is occurring due to various nonlinear effects. It is possible that this intermediate laser pulse length mode of operation may permit the creation of well-formed, regular-shaped wakefields, which would be needed for staging the LWFA process. Discussed in this paper are the model, its predictions for an LWFA experiment at the ATF, and the pulse steepening effect.

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“…With 1/γ g < a 2 0 < 1, the LA SRS becomes strongly coupled: its temporal growth rate exceeds ω pe , and the scattering EPW differs from the natural mode of plasma oscillations [18,21,26,29,30]. In a plasma-filled capillary, the strongly coupled LA SRS acquires new specific features: in a wide range of parameters relevant to the self-modulated LWFA [5], our PIC simulations (using the code WAKE [31]) discovered a vast enhancement of the near-forward SRS in the immediate vicinity of the capillary entrance aperture. The unstable plasma modes were primarily transverse and therefore useless for the longitudinal electron acceleration.…”

Section: /2mentioning

confidence: 99%

“…The technique of chirped-pulse amplification [1] made sub-picosecond laser pulses of high power (P > 10 12 W) available for generation of coherent x-rays [2], high harmonics of radiation [3], and laser wakefield acceleration (LWFA) of electrons [4,5,6] in rarefied plasmas [where ω 0 ≫ ω pe , ω 0 is a laser frequency, ω pe = (4πe 2 n 0 /m e )…”

Section: Introductionmentioning

confidence: 99%

Strongly coupled large-angle stimulated Raman scattering of short laser pulse in plasma-filled capillary

Kalmykov

Mora

2005

Physics of Plasmas

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Strongly coupled large-angle stimulated Raman scattering (LA SRS) of a short intense laser pulse develops in a plane plasma-filled capillary differently than in a plasma with open boundaries. Coupling the laser pulse to a capillary seeds the LA SRS in the forward direction (scattering angle smaller than π/2) and can thus produce a high instability level in the vicinity of the entrance plane. In addition, oblique mirror reflections off capillary walls partly suppress the lateral convection of scattered radiation and increase the growth rate of the SRS under arbitrary (not too small) angle. Hence, the saturated convective gain falls with an angle much slower than in an unbounded plasma and even for the near-forward SRS can be close to that of the direct backscatter. At a large distance, the LA SRS evolution in the interior of the capillary is dominated by quasi-one-dimensional leaky modes, whose damping is related to the leakage of scattered radiation through the walls.

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Self-resonant wakefield excitation by intense laser pulse in plasmas

Cited by 36 publications

References 2 publications

On some theoretical problems of laser wake-field accelerators

On some theoretical problems of laser wake-field accelerators

Modeling of laser wakefield acceleration atCO2laser wavelengths

Strongly coupled large-angle stimulated Raman scattering of short laser pulse in plasma-filled capillary

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