Characteristics of the preplasma formation using an uncompressed picosecond-long laser pulse with a large spot size on Al and mylar targets

Phung, Vanessa Ling Jen; Kim, Minseok; Kim, Jinju; Uhm, Han S.; Suk, Hyyong

doi:10.1016/j.cap.2019.04.006

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…Upon irradiation by an intense laser pulse, a thin solid foil turns into an expanding plume of plasma. Such plumes have been studied both numerically (29) and in experiments (30,31). To predict the plume's density profile for arbitrary Δt pre main and Epp values, the measured plasma density profiles were fitted to the form Here, n i0 is the initial solid density; R 0 is the initial radius of the plume; L 0 = c s τ pp is the initial plasma longitudinal scale length; c s is the ion acoustic velocity; R(t) and L(t) are its radial and longitudinal scale lengths, respectively; and z and r are coordinates of a cylindrical system aligned with the laser propagation direction.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Undepleted direct laser acceleration

Cohen,

Meir,

Tangtartharakul

et al. 2024

Sci. Adv.

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Ion acceleration from golden mylar film irradiated by visible ns pulsed laser

Torrisi,

Silipigni,

Cutroneo

et al. 2024

Contrib. Plasma Phys

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A Pulsed ns laser operating at 532 nm wavelength with 150 mJ pulse energy was employed to irradiate micrometric thick mylar films, from 1 to 100 μm thick, covered by 0.05 μm Au in the back face. Protons and light ions have been accelerated by the electric field developed in the non‐equilibrium plasma by the laser pulse in a vacuum at an intensity of the order of 1010 W/cm2. Time‐of‐flight technique, obtained using a Faraday cup and a fast storage oscilloscope, is employed to measure the ion velocity, energy, and yield emitted in backward and forward directions. The yield of the emitted plasma photons is also evaluated. Two ion collectors are used in opposite directions to measure the plasma radiations emitted in backward and forward directions. Data analysis is based on the Coulomb‐Boltzmann‐shifted (CBS) distribution function. The target ablation yield is evaluated in the order of 3.5 μm per laser shot.

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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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Characteristics of the preplasma formation using an uncompressed picosecond-long laser pulse with a large spot size on Al and mylar targets

Cited by 4 publications

References 24 publications

Undepleted direct laser acceleration

Undepleted direct laser acceleration

Ion acceleration from golden mylar film irradiated by visible ns pulsed laser

Multi-scale analytical description of an expanding plasma slab

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