Laser-Energy Transfer and Enhancement of Plasma Waves and Electron Beams by Interfering High-Intensity Laser Pulses

Zhang, P.; Saleh, N.; Chen, Shouyuan; Sheng, Zheng-Ming; Umstadter, Donald

doi:10.1103/physrevlett.91.225001

Cited by 25 publications

(7 citation statements)

References 22 publications

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“…The heating of the electrons allows them to be caught in the plasma wave created by the low power beam. This is the first time that one laser beam has been used to optically modify the acceleration of electrons by another laser beam Zhang et al (2003a)], thus proving the LILAC principle. If the heating pulse was shorter, less than a plasma period, and the overlap between the lasers less than a plasma wavelength, then the simulations predict that a monoenergetic pulse would result.…”

Section: Laser Injected Laser Accelerator Concept (Lilac)mentioning

confidence: 93%

“…In the process, we demonstrated for the first time the proof-of-principle of the LILAC concept: one laser pulse was used to control the energy and emittance of an electron beam driven by a separate laser pulse ; Zhang et al (2003a)l. We have also preliminarily explored another LILAC mechanism, namely heating in the electrostatic field of a density modulation driven by the interference between two pulses.…”

Section: Laser Injected Laser Accelerator Concept (Lilac)mentioning

confidence: 99%

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Femtosecond Beam Generation

Umstadter

Uesaka

Hosokai

2005

Femtosecond Beam Science

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The first issue in the field of terawatt (TW) lasers is the oscillator principle for generating ultrashort pulses.Conventional pulsed lasers are based on the Q-switching principle. The laser cavity is made of a gain medium and a switching element that triggers pulse emission. The Q switch, which can be either acousto-optical or electro-optical (the Pockels cell principle), is a variable loss element (oscillator Q modulator) and usually exhibits a switching time in the nanosecond range. Such devices do not generate pulses below the nanosecond range.

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Section: Laser Injected Laser Accelerator Concept (Lilac)mentioning

confidence: 93%

Section: Laser Injected Laser Accelerator Concept (Lilac)mentioning

confidence: 99%

Femtosecond Beam Generation

Umstadter

Uesaka

Hosokai

2005

Femtosecond Beam Science

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“…3). Such a lattice could, in principle, lead to changes to the ponderomotive dynamics [49][50][51] or stochastic heating [52,53]. Particularly, these dynamics could allow for transmissive modes, where fractions of the electron density in front of the laser transit straight through the laser beam into the cavity behind, thus diminishing cavity fields.…”

Section: Cavity Formation In Tweacmentioning

confidence: 99%

Circumventing the Dephasing and Depletion Limits of Laser-Wakefield Acceleration

et al. 2019

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Compact electron accelerators are paramount to next-generation synchrotron light sources and freeelectron lasers, as well as for advanced accelerators at the TeV energy frontier. Recent progress in laserplasma driven accelerators (LPA) has extended their electron energies to the multi-GeV range and improved beam stability for insertion devices. However, the subluminal group velocity of plasma waves limits the final electron energy that can be achieved in a single LPA accelerator stage, also known as the dephasing limit. Here, we present the first laser-plasma driven electron accelerator concept providing constant acceleration without electrons outrunning the wakefield. The laser driver is provided by an overlap region of two obliquely incident, ultrashort laser pulses with tilted pulse fronts in the line foci of two cylindrical mirrors, aligned to coincide with the trajectory of the accelerated electrons. Such a geometry of laterally coupling the laser into a plasma allows for the overlap region to move with the vacuum speed of light, while the laser fields in the plasma are continuously being replenished by the successive parts of the laser pulses. Our scheme is robust against parasitic self-injection and self-phase modulation as well as drive-laser depletion and defocusing along the accelerated electron beam. It works for a broad range of plasma densities in gas targets. This method opens the way for scaling up electron energies beyond 10 GeV, possibly towards TeV-scale electron beams, without the need for multiple laser-accelerator stages.

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“…The generation of fast electrons in a laser plasma can play a very important role for the purposes of laser thermonuclear fusion (Nakamura et al, 2006;Sakagami et al, 2006). See for example, Ivanov et al, 1996Ivanov et al, , 1995Key et al, 1998;Sheng et al, 2004;Sentoku et al, 2002. Laser energy transfer and enhancement of plasma waves and electron beams by interfering highintensity laser pulses were considered (Zhang et al, 2003). On the other hand, the positive role of high-energy electrons is very important in the scheme of laser thermonuclear fusion known as "fast ignition" (Badziak et al, 2006;Hora, 2007;Yu et al, 2007;Zvorykin et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Relativistic electron heating in focused multimode laser fields with stochastic phase perturbations

et al. 2008

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We describe a direct model for simulation of relativistic electrons acceleration with a given electromagnetic field which is determined by wave packet parameters. The multimode time-spatial structure of a focused Nd-laser beam with stochastic phase disturbances of each spectral component is taken into account as a source of random forces. Electron energies of more than 10 MeV are obtained even at moderate flux densities of 10 16 W/cm 2 . The developed numerical code makes it possible to obtain a quantitative energy distribution function in relation to both field intensity and the temporal bellshape of the laser pulse. The efficient heating of electrons can be triggered in the presence of a counter propagating wave being reflected from the critical plasma area with a different reflection coefficient. The heating mechanism occurs with a delay relative to the beginning of the pulse when the laser fields exceed some threshold amplitudes. The qualitative comparison of simulation results with the experimental data is given as evidence that this mechanism is reasonable.

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Laser-Energy Transfer and Enhancement of Plasma Waves and Electron Beams by Interfering High-Intensity Laser Pulses

Cited by 25 publications

References 22 publications

Femtosecond Beam Generation

Femtosecond Beam Generation

Circumventing the Dephasing and Depletion Limits of Laser-Wakefield Acceleration

Relativistic electron heating in focused multimode laser fields with stochastic phase perturbations

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