Laser-driven ion acceleration using isolated mass-limited spheres

Sokollik, Thomas; Paasch-Colberg, Tim; Gorling, K.; Eichmann, U.; Schnürer, M.; Steinke, S.; Nickles, P. V.; Andreev, Alexander A.; Sandner, W.

doi:10.1088/1367-2630/12/11/113013

Cited by 34 publications

(27 citation statements)

References 40 publications

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“…Initially, a literature survey was performed. The few relevant papers [63][64][65][66] either contained contradicting results to our measurements, or only had very handwaving, unsatisfying explanations.…”

Section: Full-scale Numerical Simulationsmentioning

confidence: 76%

“…Proton beam parameters such as emittance, opening angle, spatial beam profile, energy spectrum, and maximum energy cutoff are sensitive to the electron energy distribution function (EEDF) [55,56], electron transport properties [57][58][59], direction of the incoming laser wave and its phase front [60,61] as well as target geometry [20,62,63] or size [64][65][66][67][68][69]. We have focused on the target geometry and laser incidence angle, as it can be easily changed without any changes to the laser infrastructure.…”

Section: Motivationmentioning

confidence: 99%

“…However, the reduction of proton energies for too-thin MLT suggests the existence of a proton density gradient prior to main pulse [77,78], which has been thought to be caused by ns prepulse heating [65,66] or preplasma wrap-around [63]. While ZPW has substantial ns-prepulse and thus preplasma extent, the 10 μm optimum MLT thickness at Trident cannot be explained by ns-prepulse heating or preplasma since the laser lacks ns-prepulse.…”

Section: And Triangle Symbols Represent Experimental Data and Simulatmentioning

confidence: 99%

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Z-petawatt driven ion beam radiography development.

Schollmeier¹,

Geißel²,

Rambo³

et al. 2013

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Laser-driven proton radiography provides electromagnetic field mapping with high spatiotemporal resolution, and has been applied to many laser-driven High Energy Density Physics (HEDP) experiments. Our report addresses key questions about the feasibility of ion radiography at the Z-Accelerator ("Z"), concerning laser configuration, hardware, and radiation background. Charged particle tracking revealed that radiography at Z requires GeV scale protons, which is out of reach for existing and near-future laser systems. However, it might be possible to perform proton deflectometry to detect magnetic flux compression in the fringe field region of a magnetized liner inertial fusion experiment. Experiments with the Z-Petawatt laser to enhance proton yield and energy showed an unexpected scaling with target thickness. Full-scale, 3D radiation-hydrodynamics simulations, coupled to fully explicit and kinetic 2D particle-in-cell simulations running for over 10 ps, explain the scaling by a complex interplay of laser prepulse, preplasma, and ps-scale temporal rising edge of the laser.4

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Section: Full-scale Numerical Simulationsmentioning

confidence: 76%

Section: Motivationmentioning

confidence: 99%

Section: And Triangle Symbols Represent Experimental Data and Simulatmentioning

confidence: 99%

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Z-petawatt driven ion beam radiography development.

Schollmeier¹,

Geißel²,

Rambo³

et al. 2013

View full text Add to dashboard Cite

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“…To overcome these issues in the RPA process, the use of micro-high-density targets (often called as mass-limited targets with transverse size of tens of micrometers and thickness of a few nanometers) has been suggested theoretically and experimentally [13,48,50]. First, with such targets, target deformation effects will be largely reduced due to the relative uniform distribution of the local laser intensity.…”

Section: Introductionmentioning

confidence: 99%

“…Even though cluster targets may have appropriate density and enough small size, laser pulses cannot be easily focused to a single cluster. Recently, a new levitating technique is demonstrated by Sokollik et al, in which a microtarget with size of 8 m is made and isolated [50] for laser acceleration experiments. This gives a promising way for laser-micro-target interaction.…”

Section: Introductionmentioning

confidence: 99%

Stable laser-produced quasimonoenergetic proton beams from interactive laser and target shaping

Liu

Chen

Sheng

et al. 2013

Phys. Rev. ST Accel. Beams

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In radiation pressure dominated laser ion acceleration schemes, transverse target deformation and Rayleigh-Taylor (RT)-like instability always develop quickly, break the acceleration structure, limit the final accelerated ion energy, and lower the beam quality. To overcome these issues, we propose a target design named dual parabola targets consisting of a lateral thick part and a middle thin part, each with a parabolic front surface of different focus positions. By using such a target, through interactive laser and target shaping processes, the central part of the thin target will detach from the whole target and a microtarget is formed. This enables the stable acceleration of the central part of the target to high energy with high quality since usual target deformation and RT-like instabilities with planar targets are suppressed. Furthermore, this target design reduces the laser intensity required to optimize radiation pressure acceleration by more than 1 order of magnitude compared to normal flat targets with similar thickness and density. Two-dimensional particle-in-cell simulations indicate that a quasimonoenergetic proton beam with peak energy over 200 MeV and energy spread around 2% can be generated when such a solid target (with density 400n c and target thickness 0:5 0 ) is irradiated by a 100 fs long circularly polarized laser pulse at focused intensity I L $ 9:2 Â 10 21 W=cm 2 .

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Interaction of Ultra High Intensity Laser Pulse with Structured Target and Fast Particle Generation in a Stable Mode

Andreev¹,

Platonov

2013

Contrib. Plasma Phys.

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It is shown that the relief structure with optimum parameters can significantly increase the short‐pulse laser absorption, which is connected with the enhancement of moving electrons between relief ledges. Analytical modeling and numerical simulations confirm this argumentation. In the considered cases, degradation of a structure by a laser pre‐pulse is the most important factor and for this scheme to work, one needs a very high‐contrast laser‐pulse and a nanosecond laser pre‐pulse duration. The limitation on laser pulse duration is not so strong because after destruction of a first relief a secondary dynamic structure of ion density appears. Thus, high absorption connected with a relief existence continues during a long time that gives a possibility for structure targets to be more efficient compared to a plane one. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Laser-driven ion acceleration using isolated mass-limited spheres

Cited by 34 publications

References 40 publications

Z-petawatt driven ion beam radiography development.

Z-petawatt driven ion beam radiography development.

Stable laser-produced quasimonoenergetic proton beams from interactive laser and target shaping

Interaction of Ultra High Intensity Laser Pulse with Structured Target and Fast Particle Generation in a Stable Mode

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