Accessing High Pressure States Relevant to Core Conditions in the Giant Planets

Remington, B. A.; Cavallo, R. M.; Edwards, M. J.; Ho, D.; Lasinski, B. F.; Lorenz, K. Thomas; Lorenzana, H. E.; McNaney, J. M.; Pollaine, S. M.; Smith, R. F.

doi:10.1007/s10509-005-3940-2

Cited by 28 publications

(11 citation statements)

References 19 publications

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“…Generation of high-intensity ion beams driven by short pulse lasers has emerged as an important area of laserplasma research [1][2][3] due to the unique properties of intense short duration ion beams, which can be used for fast isochoric heating of dense matter [4][5][6]. For example, reaching the warm dense matter [7] conditions is relevant to laboratory astrophysics [8][9][10], geophysics [11,12] and ion fast ignition of thermonuclear fuel targets [13][14][15]. Over the past 20 years, there was notably tremendous effort to understand the underlying physics of proton and light ion acceleration.…”

Section: Introductionmentioning

confidence: 99%

Laser-driven acceleration of quasi-monoenergetic, near-collimated titanium ions via a transparency-enhanced acceleration scheme

Li¹,

Forestier-Colleoni²,

Bailly-Grandvaux³

et al. 2019

New J. Phys.

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Laser-driven ion acceleration has been an active research area in the past two decades with the prospects of designing novel and compact ion accelerators. Many potential applications in science and industry require high-quality, energetic ion beams with low divergence and narrow energy spread. Intense laser ion acceleration research strives to meet these challenges and may provide high charge state beams, with some successes for carbon and lighter ions. Here we demonstrate the generation of well collimated, quasi-monoenergetic titanium ions with energies ∼145 and 180MeV in experiments using the high-contrast (<10 −9 ) and high-intensity (6 10 W cm 20 2 -) Trident laser and ultra-thin (∼100 nm) titanium foil targets. Numerical simulations show that the foils become transparent to the laser pulses, undergoing relativistically induced transparency (RIT), resulting in a two-stage acceleration process which lasts until ∼2 ps after the onset of RIT. Such long acceleration time in the self-generated electric fields in the expanding plasma enables the formation of the quasimonoenergetic peaks. This work contributes to the better understanding of the acceleration of heavier ions in the RIT regime, towards the development of next generation laser-based ion accelerators for various applications.

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Section: Introductionmentioning

confidence: 99%

Laser-driven acceleration of quasi-monoenergetic, near-collimated titanium ions via a transparency-enhanced acceleration scheme

Li¹,

Forestier-Colleoni²,

Bailly-Grandvaux³

et al. 2019

New J. Phys.

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“…[Lorenz, 2005b] Furthermore, radiation-hydrodynamics simulations show that on future facilities, such as the NIF laser, [Hogan, 2001] this technique should be able to drive samples in the solid state to much higher pressures, P > 10 3 GPa (10 Mbar). [Remington, 2005a] Finally, we show in Fig. 5 the results of 2D simulations of the Rayleigh-Taylor (RT) instability, [Lorenz, 2005a;Remington, 2004b] for an quasi-isentropically driven RT experiment in Ta at P max ~ 2 Mbar.…”

Section: Resultsmentioning

confidence: 99%

Materials Response under Extreme Conditions

Remington¹,

Hawreliak²,

Lorenz³

et al. 2006

AIP Conference Proceedings

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Abstract.Solid state experiments at extreme pressures, 10 -100 GPa (0.1 -1 Mbar) and strain rates (10 6 -10 8 s -1 ) are being developed on high-energy laser facilities. The goal is an experimental capability to test constitutive models for high-pressure, solid-state strength for a variety of materials. Relevant constitutive models are discussed, and our progress in developing a quasiisentropic, ramped-pressure, shockless drive is given. Designs to test the constitutive models with experiments measuring perturbation growth due to the Rayleigh-Taylor instability in solid-state samples are presented.

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“…To reach pressures in excess of 10 Mbar will require a MJ-class laser. Designs are in hand [24] for ultrahigh pressure strength experiments to be performed at the National Ignition Facility. This facility will be able to generate long laser pulses (> 40 ns) at total energies approaching 2 MJ.…”

Section: Discussionmentioning

confidence: 99%

Accessing Ultra-High Pressure, Quasi-Isentropic States of Matter

Lorenz

Glendinning

Edwards

et al. 2005

IEEE Conference Record - Abstracts. 2005 IEEE International Conference on Plasma Science

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A new approach to the study of material strength of metals at extreme pressures has been developed on the Omega laser, using a ramped plasma piston drive. The laser drives a shock through a solid plastic reservoir that unloads at the rear free surface, expands across a vacuum gap, and stagnates on the metal sample under study. This produces a gently increasing ram pressure, compressing the sample nearly isentropically. The peak pressure on the sample, inferred from VISAR measurements of velocity, can be varied by adjusting the laser energy and pulse length, gap size, and reservoir density, and obeys a simple scaling relation. 1 In an important application, using in-flight x-ray radiography, the material strength of solid-state samples at high pressure can be inferred by measuring the reductions in the growth rates (stabilization) of Rayleigh-Taylor (RT) unstable interfaces. This paper reports the first attempt to use this new laser-driven, quasi-isentropic technique for determining material strength in high-pressure solids. Modulated foils of Al-6061-T6 were accelerated and compressed to peak pressures of 200 kbar. Modulation growth was recorded at a series of times after peak acceleration and well into the release phase. Fits to the growth data, using a Steinberg-Guinan (SG) constitutive strength model 2 , give yield strengths 30% greater than those given by the nominal parameters for Al-6061-T6. Calculations indicate that the dynamic enhancement to the yield strength at 200 kbar is a factor of ~2.5× over the ambient yield strength of 2.9 kbar. Experimental designs based on this drive developed for the NIF laser, predict that solid-state samples can be quasi-isentropically driven to pressures an order of magnitude higher than on Omega -accessing new regimes of dense, high-pressure matter.

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Accessing High Pressure States Relevant to Core Conditions in the Giant Planets

Cited by 28 publications

References 19 publications

Laser-driven acceleration of quasi-monoenergetic, near-collimated titanium ions via a transparency-enhanced acceleration scheme

Laser-driven acceleration of quasi-monoenergetic, near-collimated titanium ions via a transparency-enhanced acceleration scheme

Materials Response under Extreme Conditions

Accessing Ultra-High Pressure, Quasi-Isentropic States of Matter

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