Collisionless electrostatic shock formation and ion acceleration in intense laser interactions with near critical density plasmas

Liu, M.; Weng, Shangkun; Li, Y. T.; Yuan, Ding; Chen, Min; Mulser, P.; Sheng, Zheng-Ming; Murakami, M.; Yu, Lili; Zheng, Xiaolong; Zhang, J.

doi:10.1063/1.4967946

Cited by 14 publications

(8 citation statements)

References 39 publications

(50 reference statements)

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“…CSA experiments using a linearly polarized CO 2 laser with near-N cr gas-jet targets produced 20 MeV proton beam [15]. A number of experiments have been carried out over the last few years to understand and characterize ion acceleration via CSA [16][17][18][19][20][21]. One aspect of CSA that is currently not well understood for accelerating mono-energetic ions to high energies is the effect of the target material used.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of collisionless shock ion acceleration by electrostatic ion two-stream instability in the upstream plasma

Kumar

Sakawa

Döhl

et al. 2019

Phys. Rev. Accel. Beams

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Ion acceleration in electrostatic collisionless shocks is driven by the interaction of the high-power laser with specially tailored near-relativistic critical density plasma. 2D EPOCH particle-in-cell simulations show that the ion acceleration is dependent on the target material used. In materials with low charge-tomass ratio hZ=Ai, proton beams with high flux and low energy spread are generated. In multi-ion plasmas the ions with different hZ=Ai acquire different velocities under a non-oscillating component of electrostatic field in the upstream region. This relative drift between the protons (hZ=Ai ¼ 1) and the lower hZ=Ai ions leads to the excitation of electrostatic ion two-stream instability. This in turn generates a low-velocity component in the upstream expanding protons. The velocity distribution of the upstream expanding protons is further broadened toward the higher velocity by the electrostatic ion two-stream instability between reflected protons, which results in large number of protons being accelerated by the shock.

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Section: Introductionmentioning

confidence: 99%

Enhancement of collisionless shock ion acceleration by electrostatic ion two-stream instability in the upstream plasma

Kumar

Sakawa

Döhl

et al. 2019

Phys. Rev. Accel. Beams

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“…Most etch pits are shallow and of small diameter. Smallest diameters of 3.5 (15) µm belong to craters with a large variation of depth with 4.5 (30)…”

Section: Rcf Data Analysismentioning

confidence: 99%

“…The supersonic propagation of this structure through the plasma goes along with par-tial reflection of the background ions at twice the shock velocity, a mechanism termed collisionless shock acceleration (CSA). The charge separation underpinning the shock formation can be driven either directly by the laser, via its ponderomotive push on the opaque region (if any) of the plasma profile 19,[27][28][29][30][31] , or indirectly, via the pressure gradients associated with the laser heating of the bulk electrons in a fully transparent, nonuniform plasma 20,[32][33][34] . Depending on the gas profile, CSA may come along with additional acceleration mechanisms, such as TNSA 19,28 or magnetic vortex acceleration [35][36][37][38][39] .…”

mentioning

confidence: 99%

Ion acceleration by an ultrashort laser pulse interacting with a near-critical-density gas jet

Ehret,

Salgado-Lopez,

Ospina-Bohorquez

et al. 2020

Preprint

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We demonstrate laser-driven Helium ion acceleration with cut-off energies above 25 MeV and peaked ion number above 10 8 MeV −1 for 22(2) MeV projectiles from near-critical density gas jet targets. We employed shock gas jet nozzles at the high-repetition-rate (HRR) VEGA-2 laser system with 3 J in pulses of 30 fs focused down to intensities in the range between 9×10 19 Wcm −2 and 1.2×10 20 Wcm −2 . We demonstrate acceleration spectra with minor shot-to-shot changes for small variations in the target gas density profile. Difference in gas profiles arise due to nozzles being exposed to a experimental environment, partially ablating and melting.

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“…2012; Liu et al. 2016). Apart from the technological requirements for the efficient RPA of ions, e.g.…”

Section: Introductionmentioning

confidence: 99%

Radiation pressure acceleration of protons from structured thin-foil targets

Meinhold

Kumar

2021

J. Plasma Phys.

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The process of radiation pressure acceleration (RPA) of ions is investigated with the aim of suppressing the Rayleigh–Taylor-like transverse instabilities in laser–foil interaction. This is achieved by imposing surface and density modulations on the target surface. We also study the efficacy of RPA of ions from density modulated and structured targets in the radiation dominated regime where the radiation reaction effects are important. We show that the use of density modulated and structured targets and the radiation reaction effects can help in achieving the twin goals of high ion energy (in GeV range) and lower energy spread.

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Collisionless electrostatic shock formation and ion acceleration in intense laser interactions with near critical density plasmas

Cited by 14 publications

References 39 publications

Enhancement of collisionless shock ion acceleration by electrostatic ion two-stream instability in the upstream plasma

Enhancement of collisionless shock ion acceleration by electrostatic ion two-stream instability in the upstream plasma

Ion acceleration by an ultrashort laser pulse interacting with a near-critical-density gas jet

Radiation pressure acceleration of protons from structured thin-foil targets

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