Inverse bremsstrahlung of hot, weakly coupled plasmas

Wierling, A.; Millat, Thomas; Röpke, G.; Redmer, R.; Reinholz, H.

doi:10.1063/1.1383025

Cited by 44 publications

(63 citation statements)

References 38 publications

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“…(1) and (2) we have shown the second order diagrams for the bremsstrahlung and inverse bremsstrahlung process. These processes are well known and expressions were given by QED S-matrix calculations [15] as well as by a non-relativistic treatment [16]. We will draw our attention to the inverse bremsstrahlung within our formalism in the next section.…”

Section: Inclusion Of Collisionsmentioning

confidence: 99%

“…In [16] non-relativistic results for the absorption coefficient in different approximations are derived. The expression given in the paper in terms of the transition matrix correspond to the non-relativistic result of Eq.…”

Section: Evaluation Of the Correlation Functionmentioning

confidence: 99%

“…We give explicit expressions for plasmas near the equilibrium. A final expression for the inverse bremsstrahlung can be compared with other results, like relativistic S-matrix calculations in vacuum [15] or with non-relativistic results [16].…”

Section: Introductionmentioning

confidence: 99%

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Covariant linear response theory of relativistic QED plasmas

Höll

Morozov

Röpke

2003

Physica A: Statistical Mechanics and its Applications

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We start from the QED Lagrangian to describe a charged many-particle system coupled to the radiation field. A covariant density matrix approach to kinetic theory of QED plasmas, subjected to a strong external electro-magnetic field has recently been developed [1,2]. We use the hyperplane formalism in order to perform a manifest covariant quantization and to implement initial correlations to the solution of the Liouville-von Neumann equation. A perturbative expansion in orders of the fine structure constant for the correlation functions as well as the statistical operator is applied. The non-equilibrium state of the system is given within generalized linear response theory. Expressions for the susceptibility tensor, describing the plasma response, are calculated within different approximations, like the RPA approximation or considering collisions within the Born-approximation. In particular, the process of relativistic inverse bremsstrahlung in a plasma is discussed.

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Section: Inclusion Of Collisionsmentioning

confidence: 99%

Section: Evaluation Of the Correlation Functionmentioning

confidence: 99%

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Covariant linear response theory of relativistic QED plasmas

Höll

Morozov

Röpke

2003

Physica A: Statistical Mechanics and its Applications

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“…We show in this paper how the Gaunt factor can be derived from linear response theory [18] in a general way. Within this framework, modifications of the emission spectrum beyond Born aproximation can be included in a systematic manner [19] as will be discussed later.…”

Section: Introductionmentioning

confidence: 99%

“…The Kramers result, given below in Eq. (19), is derived from the assumption of Keplerian trajectories of the emitting electron in the Coulomb field of an ion and integration over all initial velocities weighted with the Maxwellian velocity distribution function. Quantum features are only accounted for in a semiclassical way: The velocity integral extends over velocities v, fulfilling the condition mv 2 /2 ≥ ω, i.e.…”

Section: Introductionmentioning

confidence: 99%

Bremsstrahlung vs. Thomson scattering in VUV-FEL plasma experiments

Fortmann

Redmer

Reinholz

et al. 2006

High Energy Density Physics

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We determine the spectral photon yield from a hot dense plasma irradiated by VUV-FEL light in a Thomson scattering experiment. The Thomson signal is compared to the emission background mainly caused by bremsstrahlung photons. We determine experimental conditions that allow for a signal-to-background ratio larger than unity. By derivation of the Thomson and the bremsstrahlung spectrum from linear response theory we present a consistent quantum statistical approach to both processes. This allows for a systematic treatment of medium and quantum effects such as dynamical screening and strong collisions. Results are presented for the threshold FEL-intensity as a function of density and temperature. We show that the account for quantum effects leads to larger thresholds as compared to previous work.

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Screening Breakdown in a Plasma by Two Laser Fields and Strong DC Magnetic Field

Miranda¹,

Guimarães²,

Fonseca³

et al. 2005

Contrib. Plasma Phys.

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The effective static dielectric constant of an electron plasma system in the simultaneous presence of two electromagnetic waves and a strong DC magnetic field is calculated. It is found that as the difference ∆ω of the two electromagnetic wave frequencies matches the plasma frequency ωρ a breakdown in screening occurs thereby increasing the plasma heating rate via the external fields due to inverse Bremmstrahlung. An application is made by considering the typical parameters of a hot plasma.

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Inverse bremsstrahlung of hot, weakly coupled plasmas

Cited by 44 publications

References 38 publications

Covariant linear response theory of relativistic QED plasmas

Covariant linear response theory of relativistic QED plasmas

Bremsstrahlung vs. Thomson scattering in VUV-FEL plasma experiments

Screening Breakdown in a Plasma by Two Laser Fields and Strong DC Magnetic Field

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