Energy balance in bremsstrahlung stimulated by strong lasers

Bivona, S.; Zangara, Rosalia; Ferrante, G.

doi:10.1007/bf02452401

Cited by 3 publications

(2 citation statements)

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“…Otherwise, the calculations of the energy absorption rate with the distribution function (4.3) complement those given previovusly in ref. [10]. The low-intensity result X~ = n!…”

Section: S~ = (--I/h)(zkr Vxkl) + (--I/h)(~kf Vg * Vzk I )mentioning

confidence: 98%

Plasma heating by a strong laser field with statistically distributed parameters

Daniele

Messina²,

Ferrante³

1991

Il Nuovo Cimento D

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Summary. --The energy absorption rate by a classical homogeneous plasma irradiated by a strong fluctuating laser field via inverse bremsstrahlung is considered. A chaotic-field model is used and comparison is made with the fundamental model of a purely coherent field. In the present analysis, the emphasis is put on the interplay between the laser field statistics and the plasma electron energy distribution. Numerical calculations are concerned with the dependence of the energy absorption rates on laser intensity and frequency. Laser intensity values up to 4.6.1015W/cm 2 are considered. The multiphoton structure of the energy absorption is analysed as well. Concerning the joint influence of the radiation and particle statistics on the absorption rate, the basic result may be stated as follows. For situations where the particle thermal velocity v7 is larger than the oscillatory velocity v0 imparted by the field (VT >I Vo, relatively weak field), the absorption rate is only weakly dependent on the field statistics. For situations, instead, when Vo >> vT, which occurs for very high intensities, the reverse becomes true: now the initial particle velocity distribution plays the modest role of a velocity spread of an electron beam oscillating at Vo. In general, for very high intensities (Vo >> VT), the energy absorption via bremsstrahlung becomes less effective because the high oscillatory velocity Vo reduces the time available to electrons for the interaction with the ions, the third body which makes possible the exchange for energy between electrons and a radiation field. We report also, for the first time, results on the Marcuse effect for the case of a chaotic laser field, along with calculations of the absorption rate for a directed electron beam. PACS 52.50.Im -Plasma production and heating by laser beams. PACS 32.80.Wr -Other multiphoton processes. 663

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“…Otherwise, the calculations of the energy absorption rate with the distribution function (4.3) complement those given previovusly in ref. [10]. The low-intensity result X~ = n!…”

Section: S~ = (--I/h)(zkr Vxkl) + (--I/h)(~kf Vg * Vzk I )mentioning

confidence: 98%

Plasma heating by a strong laser field with statistically distributed parameters

Daniele

Messina²,

Ferrante³

1991

Il Nuovo Cimento D

Self Cite

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“…This last result is reminiscent of the investigation carried out in ref. [32], where the influence of the spatial distribution of the laser intensity on the energy exchanges in the bremssthralung stimulated by strong laser field occurring in the scattering of a monoenergetic electron beam was studied. The calculations performed for this kind of problem showed that, in the region where the laser intensities are such that the oscillatory velocity imparted by the field to the electron is much less than its average velocity, the inhomogeneities of the radiation intensity do not play any role.…”

Section: -Concluding Remarksmentioning

confidence: 99%

Simultaneous multiphoton ionization by two radiation fields. Effects of the statistical properties of the radiation

1991

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Summary.--We report on calculations of differential and total ionization crosssections of hydrogen atoms irradiated by two radiation fields with different properties. One of the fields is of low intensity and relatively high frequency, the other is of low frequency and high intensity. In particular, we show that the inclusion of the multimode structure of the low-frequency laser field modifies considerably the shape of the angular distribution of the photoelectrons and the rates of ionization into the different channels characterized by the number of low-frequency photons exchanged. Further, we find that the average energy exchanged between the photoelectrons and the low-frequency radiation field is independent of the statistical properties of the low-frequency laser field.PACS 32.80 -Photon interactions with atoms.

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