Energy Penetration into Arrays of Aligned Nanowires Irradiated with Relativistic Intensities: Scaling to Terabar Pressures

Bargsten, Clayton; Hollinger, R.; Capeluto, M. G.; Kaymak, Vural; Pukhov, A.; Wang, Shoujun; Rockwood, Alex; Wang, Yong; Keiss, David; Tommasini, Riccardo; London, Richard A.; Park, Jaebum; Busquet, M.; Klapisch, M; Shlyaptsev, Vyacheslav N.; Rocca, J. J.

doi:10.2172/1361610

Cited by 11 publications

(18 citation statements)

References 26 publications

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“…Using nano-technology for ICF was recently discussed 38,39 . Placing aligned nano-rods or nano-wires on the surface of the pellet and irradiating it with femtosecond laser pulses of relativistic intensity, leads to a plasma with large electron intensity and pressure.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Radiation dominated implosion with nano-plasmonics

2018

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Inertial Confinement Fusion is a promising option to provide massive, clean, and affordable energy for humanity in the future. The present status of research and development is hindered by hydrodynamic instabilities occurring at the intense compression of the target fuel by energetic laser beams. A recent proposal by Csernai et al. 1 combines advances in two fields: detonations in relativistic fluid dynamics and radiative energy deposition by plasmonic nano-shells. The initial compression of the target pellet can be eliminated or decreased, not to reach instabilities. A final and more energetic, short laser pulse can achieve rapid volume ignition, which should be as short as the penetration time of the light across the target. In the present study, we discuss a flat fuel target irradiated from both sides simultaneously.Here we propose an ignition energy with smaller compression, largely increased entropy and temperature increase, and instead of external indirect heating and huge energy loss, a maximized internal heating in the target with the help of recent advances in nano-technology. The reflectivity of the target can be made negligible, and the absorptivity can be increased by one or two orders of magnitude by plasmonic nano-shells embedded in the target fuel. Thus, higher ignition temperature and radiation dominated dynamics can be achieved. Here most of the interior will reach the ignition temperature simultaneously based on the results of relativistic fluid dynamics. This makes the development of any kind of instability impossible, which up to now prevented the complete ignition of the target.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Radiation dominated implosion with nano-plasmonics

2018

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“…In the aforementioned scenarios the nanostructured nature of the target is essentially incidental: a near-critical target is desired, but such low density solids are unavoidably nanostructured. However, it is worth mentioning that laser interaction with structured plasmas with lower-than-solid density is under active investigation specifically for the physical effects allowed by the nanostructure [39,40]. In this work we investigate via an extensive two-dimensional(2D) numerical simulation campaign the role played by the nanostructure in relativistic laser interaction with NCPs.…”

Section: Introductionmentioning

confidence: 99%

Parametric investigation of laser interaction with uniform and nanostructured near-critical plasmas

Fedeli¹,

Formenti²,

Bottani³

et al. 2017

Eur. Phys. J. D

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Laser interaction with uniform and nanostructured near-critical plasmas has been investigated by means of 2D particle-in-cell simulations. The effect of a nanostructure (modeled as a collection of solid-density nanospheres) on energy absorption and radiative losses has been assessed in a wide range of laser intensities (normalized amplitude a 0 = 1 − 135) and average densities of the target (electron density n e = 1 − 9n c , where n c is the critical electron density). The nanostructure was found to affect mainly the conversion efficiency of laser energy into ion kinetic energy and radiative losses for the highest simulated intensities.PACS. 52.38.-r Laser-plasma interactions -52.38.Hb Self-focussing, channeling, and filamentation in plasmas -52.65.Rr Particle-in-cell method arXiv:1711.06471v2 [physics.plasm-ph]

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“…Using NW targets and mid-IR laser pulses we are able to generate solid density plasmas with keV-level bulk temperatures using only 20 mJ energy per laser pulse, in contrast to Joule-energy UV sources used so far to generate plasmas with similar parameters [23,24]. Such relaxed requirements for laser energy pave the way to the experiments at high repetition rates, which is very promising for applications in laser driven nuclear physics.…”

Section: Discussionmentioning

confidence: 99%

Relativistic Interaction of Long-Wavelength Ultrashort Laser Pulses with Nanowires

Samsonova¹,

Höfer

Kaymak

et al. 2019

Phys. Rev. X

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We report on experimental results in a new regime of a relativistic light-matter interaction employing mid-infrared (3.9 m wavelength) high intensity femtosecond laser pulses. In the laser generated plasma, the electrons reach relativistic energies already at rather low intensities due to the fortunate  2 -scaling of the kinetic energy with the laser wavelength. The lower intensity suppresses optical field ionization and creation of the pre-plasma at the rising edge of the laser pulse efficiently, enabling an enhanced efficient vacuum heating of the plasma. The lower critical plasma density for long-wavelength radiation can be surmounted by using nanowires instead of flat targets. In our experiments 80% of the incident laser energy has been absorbed resulting in a long living, keV-temperature, high-charge state plasma with a density of more than three orders of magnitude above the critical value. Our results pave the way to laser-driven experiments on laboratory astrophysics and nuclear physics at a high repetition rate.[ ] . The generated plasmas have solid density, corresponding to an unprecedented >10 3 n cr of the driving laser pulses. II. Experimental setupThe experiments were carried out at the high energy OPCPA laser system delivering 90 fs laser pulses at the 3.9 µm idler wavelength with the energy on the target up to 25 mJ at a 20 Hz repetition rate [11,12]. The beam was focused by an off-axis parabolic mirror onto a

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Energy Penetration into Arrays of Aligned Nanowires Irradiated with Relativistic Intensities: Scaling to Terabar Pressures

Cited by 11 publications

References 26 publications

Radiation dominated implosion with nano-plasmonics

Radiation dominated implosion with nano-plasmonics

Parametric investigation of laser interaction with uniform and nanostructured near-critical plasmas

Relativistic Interaction of Long-Wavelength Ultrashort Laser Pulses with Nanowires

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