Hydrodynamic Model of a Spherical Plasma Produced by <i>Q</i>-Spoiled Laser Irradiation of a Solid Particle

Fader, W.J.

doi:10.1063/1.1691802

Cited by 68 publications

(8 citation statements)

References 5 publications

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“…It has been predicted numerically that the plasma expands spherically and that the electron density can be represented by a Gaussian function. [19][20][21] This prediction has been experimentally verified in previous work by interferometry. 14,15 Therefore, we assumed that N e (r) can be represented by a Gaussian function given by…”

Section: A Plasma Target Diagnosticssupporting

confidence: 77%

“…To estimate the absorption of Ar laser in the plasma target, the optical absorption coefficient K of the plasma was calculated by 19 Kϭ…”

Section: A Plasma Target Diagnosticsmentioning

confidence: 99%

“…In order to show the high charge state stripping capabilities of the plasma, the ratio of F p (q) to F H (q) was calculated ͑Table II͒. The fractions of 12 C 5ϩ , 16 O 6ϩ , and 19 Fe 7ϩ obtained from the plasma stripper were much larger than those for the cold stripping medium at the same density. Data for dilute gases 22 F g (q) ͑dashed line͒ and carbon foil 18 ͑dashed and double-dotted line͒ strippers F c (q) are also plotted for comparison.…”

Section: B Charge State Distribution Measurementsmentioning

confidence: 99%

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Experimental study on the feasibility of hot plasmas as stripping media for MeV heavy ions

Shibata

Tsubuku

Nishimoto

et al. 2002

Journal of Applied Physics

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The feasibility of using hot plasmas as strippers for low-energy ion beams has been investigated by measuring charge state distributions of 350 keV/u ions ( 12 C, 16 O, 19 F) after their passage through a laser-produced plasma target. The plasma target was produced by irradiating a small pellet of lithium hydride with a Nd-glass laser. The profiles of electron densities of the plasma target were estimated from the intensity profiles of an Ar laser refracted by the plasma. The intensities of ions with different charge states were simultaneously measured using a time-resolved magnetic spectrograph. It was found that this plasma can yield higher charge states than conventional gaseous or solid strippers. Results of a numerical analysis are compared with the experimental data to explain the observed stripping capability of the plasma.

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Section: A Plasma Target Diagnosticssupporting

confidence: 77%

“…To estimate the absorption of Ar laser in the plasma target, the optical absorption coefficient K of the plasma was calculated by 19 Kϭ…”

Section: A Plasma Target Diagnosticsmentioning

confidence: 99%

Section: B Charge State Distribution Measurementsmentioning

confidence: 99%

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Experimental study on the feasibility of hot plasmas as stripping media for MeV heavy ions

Shibata

Tsubuku

Nishimoto

et al. 2002

Journal of Applied Physics

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“…The complete radial symmetric hydrodynamic calculation, for example, by Fader [120], with any initial radial velocity profile v(r, t=O) and an ion density profile n~r, t=O), resulted after some time t into a solution where nj became a Gaussian density profile, while the velocity became a linear profile v(r, t)= vo(t)r (5.1) R and the temperature dropped adiabatically. The plasma temperature T has, at a time to an initial value To, the radius R of the plasma an initial value R o and the velocity of expansion oR/ot an initial value R o .…”

Section: Self-similarity Modelmentioning

confidence: 99%

Plasmas at High Temperature and Density

Hora¹

1991

Lecture Notes in Physics Monographs

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Preface"New physics" is an appealing new keyword, not yet devalued by the ravages of inflation. But what has this to do with such an ugly field as plasma physics, steeped in classical physics, mostly outworn, with all its unsolved and ambiguous technological problems and its messy and open ended numerical studies?"New physics" is concerned with quarks, Higgs particles, grand unified theory, superstrings, gravitational waves, and the profound basics of cosmology and black holes. It is the field of astonishing quantum effects, demonstrated by the von Klitzing effect and hightemperature superconductors. But what can plasma physicists offer, after so many years of expensive and frustrating research to solve the problem of fusion energy?One may suggest that the fascinating research of chaos with applications to plasma, or the achievements of statistical mechanics applied to plasmas, has something to offer and should be the subject of attention. However, this is not the aim of this book.Complementing the traditional aim of physics, which is to interpret the phenomena of nature by generalizing laws such that exact predictions about new properties and effects can be drawn, this book demonstrates how new physics has been derived over the last 30 years from the state of matter which exists at high temperatures (plasma). The advent of the laser, with its very high energy densities and its concentration to extremely small volumes and to very short time periods, opened up a whole new regime for the interaction of materials and high-density plasmas, which enforced the appearance of the "rather new physics".Here are a few examples:• Who would have expected that optical waves in vacuum have a longitudinal component? Thomas Young discovered in 1801 the pure transversality of optical radiation. This was not understandable at that time, when it was known that mechanical waves never exist without longitudinal components. Maxwell's equation then only revealed solutions of the purely transverse plane waves in electromagnetism. Against all this traditional knowledge, the recent findings about the dynamics of electrons driven by laser beams by nonlinear forces led to thẽ xact derivation of longitudinal optical wave components.• The same nonlinear force interaction, in view of momentum transfer in experiments, led to the clarification of the angular momentum ofoptical beams and brought about the first substantiation of the photon spin by a macroscopic property.• The conditions of very high laser intensities led to nonlinear and relativistic generalization of the optical response (dielectrics and absorption) with a prediction of relativistic self-focusing to understand how GeV ions are produced by laser irradiation of solid targets.• The quantum generalization of Coulomb collisions in plasmas at high temperatures explains the anomalous resistivity, in agreement with observations where links are given between the simply derived Coulomb collision frequency and quantum electrodynamics, including stimulated emission. IX that after the first l...

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“…This is confirmed by a hydrodynamic model. 19 In summary, we demonstrated the dependence of the 13.5 nm EUV emission from a xenon liquid microjet target upon the CO 2 laser pulse width. We observed an increase in the EUV CE with increasing CO 2 laser pulse width between 200 ps and 25 ns.…”

mentioning

confidence: 97%

Efficient extreme ultraviolet plasma source generated by a CO2 laser and a liquid xenon microjet target

Ueno¹,

Ariga²,

Soumagne³

et al. 2007

Applied Physics Letters

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We demonstrated efficacy of a CO2-laser-produced xenon plasma in the extreme ultraviolet (EUV) spectral region at 13.5nm at variable laser pulse widths between 200ps and 25ns. The plasma target was a 30μm liquid xenon microjet. To ensure the optimum coupling of CO2 laser energy with the plasma, they applied a prepulse yttrium aluminum garnet laser. The authors measured the conversion efficiency (CE) of the 13.5nm EUV emission for different pulse widths of the CO2 laser. A maximum CE of 0.6% was obtained for a CO2 laser pulse width of 25ns at an intensity of 5×1010W∕cm2.

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Hydrodynamic Model of a Spherical Plasma Produced by Q-Spoiled Laser Irradiation of a Solid Particle

Cited by 68 publications

References 5 publications

Experimental study on the feasibility of hot plasmas as stripping media for MeV heavy ions

Experimental study on the feasibility of hot plasmas as stripping media for MeV heavy ions

Plasmas at High Temperature and Density

Efficient extreme ultraviolet plasma source generated by a CO2 laser and a liquid xenon microjet target

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