Mechanisms for collisionless absorption of light waves obliquely incident on overdense plasmas with steep density gradients

Yang, T. Y. B.; Kruer, W. L.; Langdon, A. B.; Johnston, T. W.

doi:10.1063/1.871527

Cited by 48 publications

(21 citation statements)

References 29 publications

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“…When collisional transfer sets in and the plasma begins to expand, the ratio n e /n c is reduced and absorption starts to increase again. This is in accordance with collisionless calculations of hot plasmas with density gradients in front of the target: the less steep the gradient the more absorption and the hotter the electron plasma 9 ͑see also the corresponding investigations of Yang et al 10,11 ͒. Collisions also increase the transmissivity of the plasma by almost a factor of 100 due to the fact that the plasma density is reduced.…”

supporting

confidence: 80%

Role of collisions in particle-in-cell modeling of high-density short-pulse laser-plasma interaction

2001

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One-and-one-half-dimensional particle-in-cell (PIC) modeling with restored short-encounter collisional behavior is used to model the interaction of high-intensity short laser pulses with plasmas. The role of Coulomb collisions in expanding thin plasma targets at solid density is particularly investigated. It is shown that collisions play an important role for plasma expansion and ion acceleration mechanisms, even at high laser intensities.

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supporting

confidence: 80%

Role of collisions in particle-in-cell modeling of high-density short-pulse laser-plasma interaction

2001

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“…There are other competing linear absorption mechanisms, such as anomalous skin effect ͑ASE͒, 18 sheath inverse Bremsstrahlung ͑SIB͒, 19 sheath transit absorption ͑STA͒, 20 and resonance absorption ͑RA͒ 14 in the laser-plasma interactions. If we choose an intensity of Iϭ10 15 W/cm 2 , for example, the peak electron temperature of kT e ϳ100 eV, this would result in a collision frequency ϳ5ϫ10 15 s Ϫ1 .…”

Section: Absorption Measurementsmentioning

confidence: 99%

Hot electron generation via vacuum heating process in femtosecond laser–solid interactions

et al. 2001

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Hot electron generation by the vacuum heating process has been studied in the interaction of 150 fs, 5 mJ, 800 nm P-polarized laser pulses with solid targets. The measurements have suggested that the “vacuum heating” is the main heating process for the hot electrons with high energies. The energy of the vacuum-heated hot electrons has been found to be higher than the prediction from the scaling law of resonance absorption. Particle-in-cell simulations have confirmed that the hot electrons are mainly generated by the vacuum heating process under certain experimental conditions.

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“…Therefore, electrons may penetrate into the region of large electric field during the time when E sh (x, t) > 0 [16,17]. In the discharge, however, because the sheath electric field given by Eq.…”

Section: B Large Amplitude Electric Fieldmentioning

confidence: 99%

Revisiting the Anomalous rf Field Penetration into a Warm Plasma

Kaganovich

Polomarov

Theodosiou

2005

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Radio frequency waves do not penetrate into a plasma and are damped within it. The electric field of the wave and plasma current are concentrated near the plasma boundary in a skin layer.Electrons can transport the plasma current away from the skin layer due to their thermal motion.As a result, the width of the skin layer increases when electron temperature effects are taken into account. This phenomenon is called anomalous skin effect. The anomalous penetration of the rf electric field occurs not only for transversely propagating to the plasma boundary wave (inductively coupled plasmas) but also for the wave propagating along the plasma boundary (capacitively coupled plasmas). Such anomalous penetration of the rf field modifies the structure of the capacitive sheath. Recent advances in the nonlinear, nonlocal theory of the capacitive sheath are reported. It is shown that separating the electric field profile into exponential and non-exponential parts yields an efficient qualitative and quantitative description of the anomalous skin effect in both inductively and capacitively coupled plasma.

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Mechanisms for collisionless absorption of light waves obliquely incident on overdense plasmas with steep density gradients

Cited by 48 publications

References 29 publications

Role of collisions in particle-in-cell modeling of high-density short-pulse laser-plasma interaction

Role of collisions in particle-in-cell modeling of high-density short-pulse laser-plasma interaction

Hot electron generation via vacuum heating process in femtosecond laser–solid interactions

Revisiting the Anomalous rf Field Penetration into a Warm Plasma

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