Proton acceleration by collisionless shocks using a supersonic H2 gas-jet target and high-power infrared laser pulses

Puyuelo-Valdes, P.; Henares, J. L.; Hannachi, F.; Ceccotti, T.; Ehret, M.; d’Humières, E.; Lancia, L.; Marquès, J. R.; Ribeyre, X.; Santos, J. J.; Tikhonchuk, V. T.; Tarisien, M.

doi:10.1063/1.5116337

Cited by 33 publications

(35 citation statements)

References 31 publications

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“…The intensity contrast was about 10 −6 on this facility. 39 A B-dot probe was positioned at r = 54 cm and θ = 90°. The probe measured a peak magnetic field |B max | = 1.5 × 10 −4 T and resonant frequency f τ = 1 GHz.…”

Section: Estimating the Target Charge From Magnetic Field Measuremmentioning

confidence: 99%

Electromagnetic pulse emission from target holders during short-pulse laser interactions

et al. 2020

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For the first time, a global model of electromagnetic pulse (EMP) emission connects charge separation in the laser target to quantitative measurements of the electromagnetic field. We present a frequency-domain dipole antenna model which predicts the quantity of charge accumulated in a laser target as well as the EMP amplitude and frequency. The model is validated against measurements from several high-intensity laser facilities, providing insight into target physics and informing the design of next-generation ultra-intense laser facilities. EMP amplitude is proportional to the total charge accumulated on the target, but we demonstrate that it is not directly affected by target charging time (and therefore the laser pulse duration) provided the charging time is shorter than the antenna characteristic time. We propose two independent methods for estimating the charging time based on the laser pulse duration. We also investigate the impact of target holder geometry on EMPs using cylindrical, conical and helical holders. Published as: Minenna et al., Phys. Plasmas, 27, 063102 (2020), https://doi.

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Section: Estimating the Target Charge From Magnetic Field Measuremmentioning

confidence: 99%

Electromagnetic pulse emission from target holders during short-pulse laser interactions

et al. 2020

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“…It can be run at a high-repetition rate, and the density of the plasma can be adjusted around the critical plasma density, n c ~10 19 cm -3 for a 10 m pulse. It should be noted that several groups have been pursuing idea of CSA ion acceleration in a gas jet not only using 10 m 30 but 1 m lasers [31][32][33] as well. However, interaction of ~1 m laser with H  gas jet generated protons with a smaller energy in the 1-6 MeV range [31][32][33] indicating challenges in the target control for n e >10 21 cm -3 density.…”

Section: He Ion Shock Acceleration In a Gas Jet Plasma Using Picoseco...mentioning

confidence: 99%

“…It should be noted that several groups have been pursuing idea of CSA ion acceleration in a gas jet not only using 10 m 30 but 1 m lasers [31][32][33] as well. However, interaction of ~1 m laser with H  gas jet generated protons with a smaller energy in the 1-6 MeV range [31][32][33] indicating challenges in the target control for n e >10 21 cm -3 density. In this section we describe our results on He ion acceleration to an energy of ~30 MeV by the CSA mechanism at 10 m.…”

Section: He Ion Shock Acceleration In a Gas Jet Plasma Using Picoseco...mentioning

confidence: 99%

Laser-driven collisionless shock acceleration of ions from near-critical plasmas

et al. 2020

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This paper overviews experimental and numerical results on acceleration of narrow energy spread ion beams by an electrostatic collisionless shockwave driven by 1 m (Omega EP) and 10 m (UCLA Neptune Laboratory) lasers in near critical density CH and He plasmas, respectively. Shock waves in CH targets produced high-energy ~50 MeV protons (E/E of ≤30%) and 314 MeV C 6+ ions (E/E of ≤10%). Observation of acceleration of both protons and carbon ions to similar velocities is consistent with reflection of particles off the moving potential of a shock front. For shocks driven by CO 2 laser in a gas jet, ~30 MeV peak in He ion spectrum was detected. Particle-in-cell simulations indicate that regardless of the target further control over its density profile is needed for optimization of accelerated ion beams in part of energy spread, yield and maximum kinetic energy.

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“…A second issue with gas targets is that reaching the electron densities of 10 27 m −3 required for use with optical lasers is technically challenging and requires very high backing pressures of order 500 bar. Gas targets have been used in an experiment to generate proton beams at the PICO2000 facility at LULI [25] with an intensity of I = 4 × 10 23 Wm −2 and at the Titan laser, LLNL [26] with an intensity of I = 2 × 10 23 Wm −2 . Though accelerated ions were observed in these experiments and were attributed to CSA, the high-charge feature peaked at high energy, that is characteristic of shock acceleration, was not observed.…”

Section: Introductionmentioning

confidence: 99%

Spectrally peaked proton beams shock accelerated from an optically shaped overdense gas jet by a near-infrared laser

Hicks¹,

Ettlinger²,

Borghesi³

et al. 2021

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We report on the generation of impurity-free proton beams from an overdense gas jet driven by a near-infrared laser (λ L = 1.053 µm). The gas profile was shaped prior to the interaction using a controlled prepulse. Without this optical shaping, a (30 ± 4) nC sr −1 thermal spectrum was detected transversely to the laser propagation direction with a high energy (8.27 ± 0.07) MeV, narrow energy spread ((6 ± 2) %) bunch containing (45 ± 7) pC sr −1 . In contrast, with optical shaping the radial component was not detected and instead forward going protons were detected with energy (1.32 ± 0.02) MeV, (12.9 ± 0.3) % energy spread, and charge (400 ± 30) pC sr −1 . Both the forward going and radial narrow energy spread features are indicative of collisionless shock acceleration of the protons.

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Proton acceleration by collisionless shocks using a supersonic H2 gas-jet target and high-power infrared laser pulses

Cited by 33 publications

References 31 publications

Electromagnetic pulse emission from target holders during short-pulse laser interactions

Electromagnetic pulse emission from target holders during short-pulse laser interactions

Laser-driven collisionless shock acceleration of ions from near-critical plasmas

Spectrally peaked proton beams shock accelerated from an optically shaped overdense gas jet by a near-infrared laser

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