Uniform heating of materials into the warm dense matter regime with laser-driven quasimonoenergetic ion beams

Bang, Woo-Suk; Albright, B. J.; Bradley, P. A.; Vold, Erik; Boettger, J. C.; Fernández, Juan

doi:10.1103/physreve.92.063101

Cited by 33 publications

(31 citation statements)

References 61 publications

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“…The NDCX-I and NDCX-II facilities have heated Au and Sn targets [28][29][30][31][32]. Lasers have been used to accelerate protons and Al + ions to heat C and Au samples [34][35][36]. Ref.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic disassembly and expansion of electron-beam-heated warm dense copper

et al. 2018

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Cu foils, 200 µm in thickness, were heated in two stages by a ∼100-ns-long mono-energetic electron bunch at 19.8 MeV and a current of 1.7 kA (8.5×10 14 e-) in a 2-mm-spot to Te ∼ 1 eV. After 45 ns of isochoric heating the pressure in the foil builds upto >20 GPa (200 kbar), it begins to hydrodynamically disassemble, and a velocity spread is measured. Near the end of the electron pulse the 1550 nm probe is cutoff or absorbed. Photonic doppler velocimetry measurements were made to quantify the expansion velocity, hydrodynamic disassembly time, and pressure of the foil prior to cutoff. Measurements indicate foil motion begins the instant electrons pass through the foil and continues until the particle velocity approaches the ambient sound velocity of Cu and the bulk density exceeds the critical density of the probe. Once the density of the plasma drops below the critical threshold and begins reflecting again, an expansion velocity of the classical plasma is also measured, similar to the point-source solution.

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“…The NDCX-I and NDCX-II facilities have heated Au and Sn targets [28][29][30][31][32]. Lasers have been used to accelerate protons and Al + ions to heat C and Au samples [34][35][36]. Ref.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic disassembly and expansion of electron-beam-heated warm dense copper

et al. 2018

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“…Ultra-intense laser driven ions have potential applications in neutron production 1 – 3 , medical therapies and diagnostics 4 , 5 , and warm dense matter 6 – 8 , prompting numerous studies on the fundamental nature of ion acceleration with relativistic intensity lasers. Increasing the repetition rate of the source moves laser-driven ions closer to practical applications; however, there are still many challenges to overcome in terms of ion energy, flux, beam divergence, and development of a suitable high-repetition compatible target.…”

Section: Introductionmentioning

confidence: 99%

Background pressure effects on MeV protons accelerated via relativistically intense laser-plasma interactions

Snyder

Morrison

Feister

et al. 2020

Sci Rep

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We present how chamber background pressure affects energetic proton acceleration from an ultra-intense laser incident on a thin liquid target. A high-repetition-rate (100 Hz), 3.5 mJ laser with peak intensity of $$8 \times 10^{18}\,\text {Wcm}^{-2}$$ 8 × 10 18 Wcm - 2 impinged on a 450 nm sheet of flowing liquid ethylene glycol. For these parameters, we experimentally demonstrate a threshold in laser-to-proton conversion efficiency at background pressures $$< 8\,\text {Torr}$$ < 8 Torr , wherein the overall energy in ions $$>1\,\text {MeV}$$ > 1 MeV increases by an order of magnitude. Proton acceleration becomes increasingly efficient at lower background pressures and laser-to-proton conversion efficiency approaches a constant as the vacuum pressure decreases. We present two-dimensional particle-in-cell simulations and a charge neutralization model to support our experimental findings. Our experiment demonstrates that high vacuum is not required for energetic ion acceleration, which relaxes target debris requirements and facilitates applications of high-repetition rate laser-based proton accelerators.

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“…The 80 J, 650 fs Trident laser accelerated ∼140 MeV Al + ions from 110-nm-thick Al foil onto a 10-µmthick Au and 15-µm-thick C hybrid interface. Expansion speeds of 6.7 µm/ns and 7.5 µm/ns were measured for C and Au leading to inferred temperatures of 1.7 and 5.5 eV [22,23] using the RAGE code [24] and available SESAME tables [25]. Again these experiments did not measure a plasma density.…”

Section: Introductionmentioning

confidence: 99%

Collisional heating and adiabatic expansion of warm dense matter with intense relativistic electrons

Coleman

Colgan

2017

Phys. Rev. E

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Adiabatic expansion of a warm dense Ti plasma has been observed after isochoric heating of a 100-μm-thick Ti foil with an ∼100-ns-long intense relativistic electron bunch at an energy of 19.8 MeV and a current of 1.7 kA. The expansion fits well with the analytical point-source solution. After 10 J is deposited and the plasma rapidly expands out of the warm dense phase, a stable degenerate plasma (T∼1.2eV) with n_{e}>10^{17}cm^{-3} is measured for >100 ns. This is the first temporal measurement of the generation and adiabatic expansion of a large volume (3×10^{-4}cm^{3}) of warm dense plasma isochorically heated by intense monochromatic electrons. The suite of diagnostics is presented, which includes time-resolved plasma plume expansion measurements on a single shot, visible spectroscopy measurements of the emission and absorption spectrum, measurements of the beam distribution, and plans for the future.

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Uniform heating of materials into the warm dense matter regime with laser-driven quasimonoenergetic ion beams

Cited by 33 publications

References 61 publications

Hydrodynamic disassembly and expansion of electron-beam-heated warm dense copper

Hydrodynamic disassembly and expansion of electron-beam-heated warm dense copper

Background pressure effects on MeV protons accelerated via relativistically intense laser-plasma interactions

Collisional heating and adiabatic expansion of warm dense matter with intense relativistic electrons

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