Role of collisionality and radiative cooling in supersonic plasma jet collisions of different materials

Collins, Gilbert; Valenzuela, Jorge; Speliotopoulos, C.A.; Aybar, Nicholas; Conti, F.; Beg, F. N.; Tzeferacos, Petros; Khiar, B.; Bott, A. F. A.; Gregori, G.

doi:10.1103/physreve.101.023205

Cited by 6 publications

(4 citation statements)

References 34 publications

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“…Plasma collision is a Universe phenomenon widely existing in High Energy Density Physics (HEDP) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], laboratorybased astrophysics [2,[18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36], and Inertial Confinement Fusion (ICF) projects [37]. Since rich dynamic physics exist during the colliding process, a series of different configurations have been proposed by multi-beam laser-plasma interactions.…”

Section: Introductionmentioning

confidence: 99%

“…In most HEDP experiments, it is always applied for the improvement of ion temperature and further for the enhancement of energy conversion efficiency from the laser to x-ray [11][12][13][14][15] or neutron [16,17] sources. While in the lab-astrophysics, it is widely used to create the analogous situation to investigate the collisionless shock [18][19][20][21], magnetic reconnection [22][23][24][25][26][27][28][29][30], Weible instability [31,32], electron-acceleration mechanism [33], outflow collimation [34,35] and space charge separation [2,36]…”

Section: Introductionmentioning

confidence: 99%

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Influence of laser-induced Au-plasma plume collision on the efficiency of x-ray radiations and the energy-transport process relevant to ICF

Zhang,

Yuan,

Song

et al. 2024

Nucl. Fusion

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Experiments and simulations have been carried out to study the colliding process by two lasers irradiating a gold half-hohlraum. Via analyzing the evolutionary x-ray images, radiation fluxes and self-emission spectrum of tracers, influence on the x-ray conversion efficiency and the local plasma temperature T e,i from two gold-plasma plumes have been investigated deeply, which is similar as the configuration in intertial confinement fusion (ICF). Experimental results confirm that a region with super-high electron and ion temperatures Te,i, satisfying the strong collision condition of λi < △L, where λi and △L are respectively the ion mean-free path and the gradient length of T e. It leads to almost 30% increasing of M-band component compared to that from a single laser-irradiation case. Meanwhile ion temperature in this region increases more rapidly than electrons, reaching about T i≅(16±4)keV (T e≅(2± 0.2)keV). Thus, our studies provide the experimental evidence of quantitative x-ray enhancement and a non-equilibrium evolution simultaneously due to the plasma collision for the first time. Besides, two-dimensional simulation results reveal that this process can not be precisely described by the traditional shock-heating model by dissipating the shock energy only to ions. But by distributing the viscous heating between both electrons and ions as theoretically discussed by Douglas S. Miller [Comput. Fluids, 210,104672(2020)], numerical results can match experiments better. This discovery will be of great importance to improve the precision of numeral prediction for ICF.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of laser-induced Au-plasma plume collision on the efficiency of x-ray radiations and the energy-transport process relevant to ICF

Zhang,

Yuan,

Song

et al. 2024

Nucl. Fusion

View full text Add to dashboard Cite

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“…This broadening has attracted widespread interest in aero-optics 1,2 and plasma physics. [3][4][5][6] Two techniques for measuring these density fluctuations are often used in high-energy-density (HED) plasmas: shadowgraphy and schlieren imaging. In shadowgraphy, density fluctuations produce intensity variations (light and dark regions) in the laser beam which are proportional to the second derivative of the electron density.…”

Section: Introductionmentioning

confidence: 99%

“…7 With both shadowgraphy and schlieren, the analysis of turbulence is often similar: the image is Fourier transformed, the spectrum of intensity variations is linked to the spectrum of density fluctuations, and a power-law fit is made and compared with theoretical predictions. 5,6 These imaging techniques have two significant drawbacks. First, large density gradients result in ray crossings, leading to caustics 7,8 which prevent a unique reconstruction of the density fluctuations.…”

Section: Introductionmentioning

confidence: 99%

An Imaging Refractometer for Density Fluctuation Measurements in High Energy Density Plasmas

Hare,

Burdiak,

Merlini

et al. 2020

Preprint

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We report on a recently developed laser-based diagnostic which allows direct measurements of ray-deflection angles in one axis, whilst retaining imaging capabilities in the other axis. This allows us to measure the spectrum of angular deflections from a laser beam which passes though a turbulent high-energy-density plasma. This spectrum contains information about the density fluctuations within the plasma, which deflect the probing laser over a range of angles. The principle of this diagnostic is described, along with our specific experimental realisation. We create synthetic diagnostics using ray-tracing to compare this new diagnostic with standard shadowgraphy and schlieren imaging approaches, which demonstrates the enhanced sensitivity of this new diagnostic over standard techniques. We present experimental data from turbulence behind a reverse shock in a plasma and demonstrate that this technique can measure angular deflections between 0.05 and 34 mrad, corresponding to a dynamic range of over 500.

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Axial outflows from conical wire array z-pinches as a tool for surface modifications

et al. 2020

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Role of collisionality and radiative cooling in supersonic plasma jet collisions of different materials

Cited by 6 publications

References 34 publications

Influence of laser-induced Au-plasma plume collision on the efficiency of x-ray radiations and the energy-transport process relevant to ICF

Influence of laser-induced Au-plasma plume collision on the efficiency of x-ray radiations and the energy-transport process relevant to ICF

An Imaging Refractometer for Density Fluctuation Measurements in High Energy Density Plasmas

Axial outflows from conical wire array z-pinches as a tool for surface modifications

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