Efficient forward direct laser acceleration of electrons in subcritical plasma with injection through hybrid parametric instability

Gorlova, D.A.; Tsymbalov, I. N.; Иванов, К. А.; Zavorotnyi, A.Y.; Nedorezov, V.; Savel’ev, A. B.

doi:10.1117/12.2589123

Cited by 6 publications

(5 citation statements)

References 13 publications

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“…We measured the pointing stability of the electron beam in our experiments to be 8.2 mrad (root mean square), lower than the beam divergence and notably lower than that reported in (22,26,41). This difference is likely due to the low pre-pulse energy (1.9 mJ) and long Δt pre main interval (60 ns).…”

mentioning

confidence: 49%

Undepleted direct laser acceleration

Cohen,

Meir,

Tangtartharakul

et al. 2024

Sci. Adv.

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Intense lasers enable generating high-energy particle beams in university-scale laboratories. With the direct laser acceleration (DLA) method, the leading part of the laser pulse ionizes the target material and forms a positively charged ion plasma channel into which electrons are injected and accelerated. The high energy conversion efficiency of DLA makes it ideal for generating large numbers of photonuclear reactions. In this work, we reveal that, for efficient DLA to prevail, a target material of sufficiently high atomic number is required to maintain the injection of ionization electrons at the peak intensity of the pulse when the DLA channel is already formed. We demonstrate experimentally and numerically that, when the atomic number is too low, the target is depleted of its ionization electrons prematurely. Applying this understanding to multi-petawatt laser experiments is expected to result in increased neutron yields, a perquisite for a wide range of research and applications.

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mentioning

confidence: 49%

Undepleted direct laser acceleration

Cohen,

Meir,

Tangtartharakul

et al. 2024

Sci. Adv.

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“…For ∆t fs−ns = −2 and −1 ns, which correspond to the electrons' signal maximum, an electron beam with ∼0.05 rad divergence (D) is observed. Its properties were previously discussed in detail in [20,21], here we only note its ∼0.2 rad pointing stability (PS) over 500 consecutive laser shots and temperature T ≈ 2 MeV (parameter of exponential electrons' energy distribution dN/dE ∼ e −E/T , typical for laser-plasma accelerators, where N-electrons' number, E-electrons' energy). For ∆t fs−ns = 0 ns beam divergence increases to D = 0.1-0.2 rad and its pointing stability up to PS ∼ 0.4 rad, while temperature decreases to T ≈ 1.5 MeV.…”

Section: Thz Radiation Propertiesmentioning

confidence: 95%

“…In [21] it was shown that the first maximum fully coincides with electrons generated in the direction of reflection. As it is much easier and reasonable to collect THz radiation in the transition direction (especially at normal incidence) further we will discuss only the second maximum.…”

Section: Thz Radiation Propertiesmentioning

confidence: 99%

“…Our first experimental results on the generation of THz radiation were measured in configuration A and previously published in [21]. In those experiments, however, laser incidence angle was 45 • .…”

Section: Thz Radiation Propertiesmentioning

confidence: 99%

“…In our previous papers, an electrons' acceleration from such a two-pulse scheme had already been experimentally and numerically studied [20,21]. The first results on the generation of THz radiation on our experimental setup were also published in [21], where a strong dependence of the THz radiation energy on the delay between the main pulse and the prepulse (i.e.…”

Section: Introductionmentioning

confidence: 95%

See 2 more Smart Citations

Transition radiation in the THz range generated in the relativistic laser—tape target interaction

Gorlova¹,

Tsymbalov²,

Volkov³

et al. 2022

Laser Phys. Lett.

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Generation of terahertz (THz) radiation in the interaction of laser pulse with intensity ∼5 × 1018 W cm−2 with a controlled preplasma, created by an additional laser pulse interacting with a 16 μm film target, was studied. The mechanism of generation of THz radiation in the frequency range 1–5 THz was found to be coherent transition radiation of accelerated electrons transversing the rear plasma-vacuum boundary. Angular distribution of the THz radiation changes with the delay between main pulse and prepulse due to different regimes of electron acceleration, while THz radiation spectrum reflects the spatial size of the preplasma cloud and may be used for diagnostics purposes. THz radiation energy reaches ∼0.1 mJ in 1–5 THz spectral range, corresponding to 0.2% conversion efficiency, and increases linearly with laser pulse energy.

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Multi-scale analytical description of an expanding plasma slab

Cohen,

Meir,

Elkind

et al. 2024

Physics of Plasmas

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We present a new analytical model for the expansion of a thin slab of plasma into vacuum. By considering the rising plasma scale length during the initial heating phase, we were able to give the plasma a smooth quadratic behavior at the origin while describing its exponentially falling density at a large distance. We show this functional form to be a solution to the plasma equations and validate its predictions against numerical simulations and experimental measurements. We demonstrate the applicability of the model to experimental scenarios in which solid foils are turned into tens of micrometer-scale plasmas, to serve as targets for direct laser acceleration of electrons.

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Efficient forward direct laser acceleration of electrons in subcritical plasma with injection through hybrid parametric instability

Cited by 6 publications

References 13 publications

Undepleted direct laser acceleration

Undepleted direct laser acceleration

Transition radiation in the THz range generated in the relativistic laser—tape target interaction

Multi-scale analytical description of an expanding plasma slab

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