Effects of laser polarizations on shock generation and shock ion acceleration in overdense plasmas

Kim, Young-Kuk; Kang, Tae Uk; Jung, Moon Youn; Hur, Min Sup

doi:10.1103/physreve.94.033211

Cited by 3 publications

(2 citation statements)

References 34 publications

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“…For the particle-in-cell simulations, we used the ‘cplPIC’ code, which employs the standard Yee-mesh-based field solver 54 , Villasenor-Buneman charge-conserving scheme for current calculation 55 and Boris mover for particle motion 56 . The ‘cplPIC’ code has been verified via diverse simulation studies in laser wakefield electron acceleration 57 , target-normal-sheath ion acceleration 58 , shock-ion-acceleration 59 , terahertz emission from a magnetized plasma 31 , terahertz emission from density gradient 7 and Raman amplification 1 (the envelope module was used for this study).…”

Section: Methodsmentioning

confidence: 99%

High-Energy, Short-Duration Bursts of Coherent Terahertz Radiation from an Embedded Plasma Dipole

Kwon

Kang

Song

et al. 2018

Sci Rep

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Emission of radiation from electrons undergoing plasma oscillations (POs) at the plasma frequency has attracted interest because of the existence of intriguing and non-trivial coupling mechanism between the electrostatic PO and the emitted electromagnetic wave. While broadband emission from plasma waves in inhomogeneous plasma is well known, the underlying physics of narrowband emission at the plasma frequency observed in experiments and in solar radio-bursts is obscure. Here we show that a spatially-localized plasma dipole oscillation (PDO) can be generated when electrons are trapped in a moving train of potential wells produced by the ponderomotive force of two slightly detuned laser pulses that collide in plasma and give rise to a burst of quasi-monochromatic radiation. The energy radiated in the terahertz spectral region can reach an unprecedented several millijoules, which makes it suitable for applications requiring short pulses of high-intensity, narrowband terahertz radiation.

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Section: Methodsmentioning

confidence: 99%

High-Energy, Short-Duration Bursts of Coherent Terahertz Radiation from an Embedded Plasma Dipole

Kwon

Kang

Song

et al. 2018

Sci Rep

Self Cite

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“…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] .…”

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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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Unstable longitudinal expansion of plasma foils accelerated by circularly polarized laser pulses in non-transparent regimes

2019

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Relativistic opaqueness has been considered to be a sufficient condition for the stable compression and acceleration of a negligibly thin plasma foil by a circularly polarized laser pulse. However, in our simulations, we observed that finite-thick plasma foils, which are still relativistically nontransparent to the laser pulse, can be subject to sudden and rapid expansion of the foil even when the pulse intensity is expected to be high enough to suppress the electrostatic Coulomb expansion. Analyzing the “distribution” of the ponderomotive force over the finite thickness of a slab-like foil, we found a theoretical condition to avoid the new expansion mechanism. Relations between this expansion and the relativistic electron heating and self-induced transparency are discussed.

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Effects of laser polarizations on shock generation and shock ion acceleration in overdense plasmas

Cited by 3 publications

References 34 publications

High-Energy, Short-Duration Bursts of Coherent Terahertz Radiation from an Embedded Plasma Dipole

High-Energy, Short-Duration Bursts of Coherent Terahertz Radiation from an Embedded Plasma Dipole

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

Unstable longitudinal expansion of plasma foils accelerated by circularly polarized laser pulses in non-transparent regimes

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