Electromagnetic Structure Resonances in Inhomogeneous Plasma Layers

Mayer, F. J.; Osborn, Richard K.; Daniels, D. W.; Mcgrath, Joseph F.

doi:10.1103/physrevlett.40.30

Cited by 23 publications

(3 citation statements)

References 13 publications

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“…In contrast to this, Honig [59] measured emission currents of 100 A, which was in contradiction to any knowledge of space charge restrictions (Child-Langmuir law). [79]. It is now evi,dent that a special mechanism takes over above powers of around 1 to 10 MW.…”

Section: Review Of Phenomena and Resultsmentioning

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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Section: Review Of Phenomena and Resultsmentioning

confidence: 99%

Plasmas at High Temperature and Density

Hora¹

1991

Lecture Notes in Physics Monographs

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“…If a uniform spherical laser irradiation (obviously with a low degree of hot spots) on a pellet is achieved, the conversion of 50% of the laser energy into non-thermal ions of 60 keV energy (Slater 1977;Mayer et al 1978) cannot be electrostatic only (because of the over-large number of ions) but could, without self-focusing, be generated by nonlinear forces on the spherical surface. Other processes, such as Denisov's resonance absorption (Hora 1981), need oblique laser incidence and a polarization dependence which was not observed in the case of the pellets by Slater (1977) and Mayer et al (1978). The action of instabilities can be expected not to be dominant for the transfer of laser energy as shown by Chen et al (1979).…”

Section: Double Layer At Nonlinear Forces Of Laser Driven Plasmamentioning

confidence: 99%

Electrostatic fields and charged particle acceleration in laser produced plasmas

Hora

1983

Laser Part. Beams

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While the action of electrostatic double layers in the periphery of an expanding laser produced plasma has been discussed and treated many years ago, some new aspects pioneered recently by Alfven in the theory of cosmic plasmas, indicate the possibility of a new treatment. The thermally produced electrostatic double layer which has been re-derived for a homogeneous plasma shows that a strong upshift of ion energies (by the mass ratio) is possible, in agreement with experiments. The number of accelerated ions is many orders of magnitude smaller than observed at keV and MeV energies. The nonlinear force acceleration could explain the number and energy of the observed fast ions. It is shown, however, that electrostatic double layers can be generated which should produce super-fast ions. This paper presents a derivation of the spread double layers in the case of inhomogeneous plasmas. It is concluded that the hydrodynamically expected multi GeV heavy ions for 10TW laser pulses (generated by relativistic self-focussing and nonlinear forces) should produce super-fast ions up to the TeV range. Further conclusions are drawn from the electrostatically measured upshifted (by 300 keV) DT fusion alphas from laser compressed plasma. An analysis of alpha spectra attempts to distinguish between different models of the stopping power in the plasmas. The analysis preliminarily arrives at a preference for the collective model.

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“…[1 -3] their soliton character is treated, in Refs. [4] and [5] the resonance properties of density modifications are stressed. They all have in common that no essential flow of the plasma has been taken into account.…”

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confidence: 99%

Radiation Pressure Dominated Plasma Flow

Mulser

Spindler

1979

Zeitschrift Für Naturforschung A

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The influence of light pressure on plane and spherical plasma flows is treated. Numerical calculations show that smooth laser pulses lead to formation of an overdense plateau if thermal transport is non-negligible there, and that an originally supersonic flow becomes subsonic in this region. The results are consistent with analytical considerations. Density humps, as reported in the literature, are found in conjunction with spiking pulses or prepulses only.

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Electromagnetic Structure Resonances in Inhomogeneous Plasma Layers

Cited by 23 publications

References 13 publications

Plasmas at High Temperature and Density

Plasmas at High Temperature and Density

Electrostatic fields and charged particle acceleration in laser produced plasmas

Radiation Pressure Dominated Plasma Flow

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