Laser-triggered proton acceleration from hydrogenated low-density targets

Brantov, A. V.; Obraztsova, Ekaterina A.; Bychenkov, a.V. Yu

doi:10.1103/physrevaccelbeams.20.061301

Cited by 12 publications

(6 citation statements)

References 25 publications

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“…The demand for compact sources of secondary radiation prompts the search for acceleration mechanisms and laser-target interaction schemes to optimize the characteristics and increase the efficiency and energy of accelerated particles. An important role in this context is played by innovative micro-and nanoscale targets including targets with ordered or random surface structures in the form of microwires (micrograss) of submicrometer size [1][2][3][4], targets with microchannels [4], targets from nanotubes [5,6], and also targets with a surface in the form of microlayers [7], grooves, cones, spheres [8], etc. In Fig.…”

Section: Introductionmentioning

confidence: 99%

Neutron Production from Structured Targets Irradiated By an Ultrashort Laser Pulse

et al. 2021

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We study the laser-driven generation of thermonuclear neutrons from targets with a microstructured surface in the form of deuterated microwires, using three-dimensional numerical simulation with previously obtained results of large-scale structural optimization of the target, which provides its best heating by femtosecond laser pulses of moderate intensity. We show that, for modern laser technologies, femtosecond lasers of low (several mJ) energy are even better for creating a neutron source than more powerful (∼1 J) lasers because the mode of high (∼1 kHz) pulse repetition rate is practically available. Microlayers (relief) and cylindrical microholes on the irradiated side are considered as alternative microstructured targets. For the latter, we demonstrate accumulation of ions on the axis of the holes, which leads to increase in the ion density above the initial value and consequently to a possible increase in the yield of thermonuclear neutrons.

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Section: Introductionmentioning

confidence: 99%

Neutron Production from Structured Targets Irradiated By an Ultrashort Laser Pulse

et al. 2021

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“…We demonstrate that the ion trapping initiates with the transition from fluid-like to kinetic behaviour, accompanied by the transition from oscillatory to self-trapping dynamics, as well as the transition from non-crossing to crossing trajectories. It happens in near-critical [14][15][16][17] relativistically transparent [18] plasma. The interesting point is that this trapping process is self-regulating and stops when the number of trapped ions is large enough.…”

Section: Introductionmentioning

confidence: 99%

Self-trapping and acceleration of ions in laser-driven relativistically transparent plasma

Liu¹,

Meyer‐ter‐Vehn

Rühl³

2018

Physics of Plasmas

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Self-trapping and acceleration of ions in laser-driven relativistically transparent plasma are investigated with the help of particle-in-cell simulations. A theoretical model based on ion wave breaking is established in describing ion evolution and ion trapping. The threshold for ion trapping is identified. Near the threshold ion trapping is self-regulating and stops when the number of trapped ions is large enough. The model is applied to ion trapping in three-dimensional geometry.Longitudinal distributions of ions and the electric field near the wave breaking point are derived analytically in terms of power-law scalings. The areal density of trapped charge is obtained as a function of the strength of ion wave breaking, which scales with target density for fixed laser intensity. The results of the model are confirmed by the simulations.

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“…One theoretical mechanism of continuous and direct energy transfer from the laser to ions is a form of relativistic hole boring: Instead of boring into the plasma, the laser now penetrates into the relativistically transparent plasma as it pushes forward the relativistic critical density front, synchronized to the acceleration of ions. This is the mechanism of 'synchronized acceleration of ions using slow light' described in [33][34][35][36][37]. However, the naming can be confusing as the core of the mechanism is not the change of the propagation velocity of the laser light inside the plasma but rather the fact that the point of laser reflection, i.e.…”

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confidence: 99%

Optimized laser ion acceleration at the relativistic critical density surface

Göthel

Bernert

Bußmann

et al. 2022

Plasma Phys. Control. Fusion

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In the effort of achieving high-energetic ion beams from the interaction of ultrashort laser pulses with a plasma, volumetric acceleration mechanisms beyond Target Normal Sheath Acceleration have gained attention. A relativisticly intense laser can turn a near critical density plasma slowly transparent, facilitating a synchronized acceleration of ions at the moving relativistic critical density front. While simulations promise extremely high ion energies in in this regime, the challenge resides in the realization of a synchronized movement of the ultra- relativistic laser pulse (a0>∼30) driven reflective relativistic electron front and the fastest ions, which imposes a narrow parameter range on the laser and plasma parameters. We present an analytic model for the relevant processes, confirmed by a broad parameter simulation study in 1D- and 3D-geometry. By tayloring the pulse length and plasma density profile at the front side, we can optimize the proton acceleration performance and extend the regions in parameter space of efficient ion acceleration at the relativistic relativistic density surface.

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Laser-triggered proton acceleration from hydrogenated low-density targets

Cited by 12 publications

References 25 publications

Neutron Production from Structured Targets Irradiated By an Ultrashort Laser Pulse

Neutron Production from Structured Targets Irradiated By an Ultrashort Laser Pulse

Self-trapping and acceleration of ions in laser-driven relativistically transparent plasma

Optimized laser ion acceleration at the relativistic critical density surface

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