Atomic Processes in High-Density Plasmas

More, R.M.

doi:10.1007/978-1-4613-3763-8_11

Cited by 6 publications

(3 citation statements)

References 38 publications

(41 reference statements)

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“…An additional data point, Z * = 24, was chosen as an arbitrary value between 19 and 27. When modelling the ionization process self-consistently, the ions were initialized with Z * 0 = 5, in accordance with the widely used Thomas-Fermi model (More 1983). Both field-tunnelling and electron-ion impact ionization were enabled.…”

Section: Simulation Designmentioning

confidence: 99%

Fast collisional electron heating and relaxation in thin foils driven by a circularly polarized ultraintense short-pulse laser

Sundström

Grémillet²,

Siminos

et al. 2020

J. Plasma Phys.

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We investigate collisionally induced energy absorption of an ultraintense and ultrashort laser pulse in a solid copper target using particle-in-cell simulations. We find that, upon irradiation by a 2 × 10 20 W cm −2 intensity, 60 fs duration, circularly polarized laser pulse, the electrons in the collisional simulation rapidly reach a well-thermalized distribution with ≈3.5 keV temperature, while in the collisionless simulation the absorption is several orders of magnitude weaker. Circular polarization inhibits the generation of suprathermal electrons, while ensuring efficient bulk heating through inverse Bremsstrahlung, a mechanism usually overlooked at relativistic laser intensity. An additional simulation, taking account of both collisional and field ionization, yields similar results: the bulk electrons are heated to ≈2.5 keV, but with a somewhat lower degree of thermalization than in the pre-set, fixed-ionization case. The collisional absorption mechanism is found to be robust against variations in the laser parameters. At fixed laser pulse energy, increasing the pulse duration rather than the intensity leads to a higher electron temperature. The creation of well-thermalized, hot and dense plasmas is attractive for warm dense matter studies. † Email address for correspondence: andsunds@chalmers.se

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Section: Simulation Designmentioning

confidence: 99%

Fast collisional electron heating and relaxation in thin foils driven by a circularly polarized ultraintense short-pulse laser

Sundström

Grémillet²,

Siminos

et al. 2020

J. Plasma Phys.

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“…This correlation heating mechanism operates on ion-plasma-frequency time scales , which is much faster than energy exchange due to interspecies Coulomb collisions (More 1980, 1981, 1983).…”

Section: Introductionmentioning

confidence: 99%

“…This mechanism is an example of correlation heating, in which changing the spatial correlations between particles leads to a rapid conversion of potential energy into kinetic energy. This correlation heating mechanism operates on ion-plasma-frequency time scales t ∼ 1/ω pi , which is much faster than energy exchange due to interspecies Coulomb collisions (More 1980(More , 1981(More , 1983.…”

Section: Introductionmentioning

confidence: 99%

Fast correlation heating in moderately coupled electron–ion plasmas

Foster,

Fetsch,

Fisch

2023

J. Plasma Phys.

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If the electrons in a plasma are suddenly heated, the resulting change in Debye shielding causes the ion kinetic energy to quickly increase. For the first time, this correlation heating, which is much faster than collisional energy exchange, is rigorously derived for a moderately coupled, electron–ion plasma. The electron–ion mass ratio is taken to be the smallest parameter in the Bogoliubov–Born–Green–Kirkwood–Yvon hierarchy, smaller even than the reciprocal of the plasma parameter. This ordering differs from conventional kinetic theory by making the electron collision rates faster than the ion plasma frequency, which allows stronger coupling and makes the ion heating a function only of the total energy supplied to the electrons. The calculation uses known formulae for correlations in a two-temperature plasma, for which a new, elementary derivation is presented. Suprathermal ions may be created more rapidly by this mechanism than by ion–electron Coulomb collisions. This means that the use of a femtosecond laser pulse could potentially help to achieve ignition in certain fast ignition approaches to inertial confinement fusion.

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Atoms In Dense Plasmas

1986

Atoms in Unusual Situations

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Atomic Processes in High-Density Plasmas

Cited by 6 publications

References 38 publications

Fast collisional electron heating and relaxation in thin foils driven by a circularly polarized ultraintense short-pulse laser

Fast collisional electron heating and relaxation in thin foils driven by a circularly polarized ultraintense short-pulse laser

Fast correlation heating in moderately coupled electron–ion plasmas

Atoms In Dense Plasmas

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