A model for laser driven ablative implosions

Max, C. E.; McKee, Christopher F.; Mead, W. C.

doi:10.1063/1.863183

Cited by 180 publications

(63 citation statements)

References 30 publications

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“…Thus for perturbations initialized at the critical surface, the proper boundary conditions for the assumed stable flow pattern is to consider only perturbations which decay away from the critical surface. (19) so that the separation between X, and X A is 0.16. It is now assumed that aL quantities are the x dependent solutions described in Section I1 plus a small transverse perturbation proportional to exp iky.…”

Section: The Effect On Non-uniform Illuminationmentioning

confidence: 99%

Steady-state planar ablative flow

Manheimer

Colombant

Gardner

1982

The Physics of Fluids

196

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Steady-state planar ablative flow in a laser produced plasma is studied. The calculations relate all steady-state fluid quantities to only three parameters, the material, absorbed irradiance, and laser wavelength. The fluid is divided into three regions; the subcritical expanding plasma, the steady-state ablation front, and the accelerated slab. Boundary conditions at the interfaces of these regions are given. If the absorbed irradiance is nonuniform, the nonuniformity in ablation pressure is calculated. Results are compared with experiment and fluid simulation for both uniform and nonuniform illumination.

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Section: The Effect On Non-uniform Illuminationmentioning

confidence: 99%

Steady-state planar ablative flow

Manheimer

Colombant

Gardner

1982

The Physics of Fluids

196

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“…Notice that Z, is some appropriate mean value of several ionization levels, which may be of order of 10 for typical ablators; we assumed Z, > 1 (large ion mass number^,) to simplify the analysis (the assumption T, = T e of Ref. 4 leads to errors unless Z, is large). For the ablative regime of interest, and ,4, large, full ionization may not occur throughout the corona, the less so in the overdense, low-temperature, classical region at the boundary of which condition (17) is established: for Z, c~A,/2, Z, c^A,/X and Z, c^A,/A, we get f[M, = 1)-4.95X10" 2 , 4.04X10" 2 , and 3.50xl(T 2 , respectively.…”

Section: Figmentioning

confidence: 99%

“…Furthermore if M s < 1 the problem that ensues is undetermined; in Ref. 4 To find W we must consider the interval y c < 77 < 00. We find that there are three different cases.…”

Section: Figmentioning

confidence: 99%

“…Later Gitomer et al 2 and Afanas'ev et al 3 carried out detailed analytical studies. Max et al 4 introduced into the problem the usual flux-limit factor/ to take into account that flux saturation must occur over part of the corona under a broad range of conditions; they presented a thorough discussion of physical phenomena not included in the analysis. Saturation in a related astrophysical context had been discussed by Cowee and McKee.…”

Section: Introductionmentioning

confidence: 99%

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Ion charge number and flux saturation effects in the corona of a laser-irradiated pellet

Sanz¹

1983

The Physics of Fluids

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The quasisteady structure of the corona of a laser-irradiated pellet is completely determined for arbitrary Z, (ion charge number} and r e /r a (ratio of critical and ablation radii), and for heat-flux saturation factor/above approximately 0.04. The ion-to-electron temperature ratio at r c grows sensibly with Z,; all other quantities depend weakly and nonmonotonically on Z,. For r c /r a close to unity, and all Z, of interest (Z, < 47}, the flow is subsonic at r c . For a given laser power W, flux saturation may decrease (low/) or increase (high/) the ablation pressure P a relative to the value obtained when saturation is not considered; in some cases a decrease in/with W fixed increases P a . For intermediate^ ~0.1), P a cc (W/r* ) 2/3 p\ n \p c = critical density), independently of r c /r a ; for/~0.6, P a «s larger by a factor of about [r c /r a f 13 . For rjr a > 1.2 roughly, the mass ablation rate is C{Z,) [{m/kZ.f^Kr^Pl) l, \ independent of p c and/, and barely dependent on Z,(m, is ion mass; k, Boltzmann's constant; K, conductivity coefficient; and C, a tabulated function).

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“…Although several theoretical models of plasma expansion were developed already in the 70's and in the 80's [1][2][3] and many experiments have studied this aspect, still there are not many "clean" experimental results. Indeed most experiments are influenced by 2D effects in the hydro expansion of the plasma, which arise as a consequence of the small focal spots, which were needed to produce the relatively high laser intensity of interest in these experiments.…”

Section: Introductionmentioning

confidence: 99%

Time-Resolved Analysis of High-Power-Laser Produced Plasma Expansion in Vacuum

Aliverdiev¹,

Batani²,

Malka³

et al. 2005

AIP Conference Proceedings

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Abstract.Here we consider the results of an experimental investigation of the temporal evolution of plasmas produced by high power laser irradiation of various types of target materials. The experiment was performed at the LULI Laboratory (Ecole Polytechnique, Paris). We have developed a method to analyze time-resolved streak-camera images and analyzed a number of results obtained with various materials.

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A model for laser driven ablative implosions

Cited by 180 publications

References 30 publications

Steady-state planar ablative flow

Steady-state planar ablative flow

Ion charge number and flux saturation effects in the corona of a laser-irradiated pellet

Time-Resolved Analysis of High-Power-Laser Produced Plasma Expansion in Vacuum

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