X-Ray Production in Laser-Heated Plasmas

Bernstein, Melvin J.; Comisar, G. G.

doi:10.1063/1.1658739

Cited by 32 publications

(14 citation statements)

References 15 publications

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“…Actually, it can be shown that the main source of radiation is due to bound-bound processes. Bernstein and Comisar 34 give an empirical formula for evaluating the ratio of the various emitting processes. In the case of line ͑bound-bound transitions͒ versus recombination ͑free-bound transitions͒ emissions, the ratio of the radiated powers is…”

Section: Limitations Of the Modelmentioning

confidence: 99%

Numerical study of nanosecond laser interactions with micro-sized single droplets and sprays of xenon

Auguste

Dortan

Ceccotti

et al. 2007

Journal of Applied Physics

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We present a thorough numerical study on interactions of a nanosecond laser with micro-sized xenon droplets. We developed a code which allows simulation of laser interactions with a single droplet as well as a spray. We give a detailed description of the code, and we present results on the dynamics of a microplasma produced by irradiation of a single xenon droplet with a laser focused at peak vacuum intensity in the 5×1010−5×1012 W∕cm2 range. We find that the heating of the plasma depends dramatically on the laser parameters (duration, pulse shape, and intensity) on one hand, and on the droplet diameter on the other. We also present results obtained with a spray which show that the dynamics of the microplasmas is very sensitive to the position of the droplets in the interaction volume. The predictions of our model agree well with recent experimental observations performed on laser-produced plasma sources for extreme ultraviolet lithography. In particular, the postprocessing of our data with a sophisticated atomic physics code has allowed us to reproduce quite well the spectrum emitted in the extreme ultraviolet range by a xenon plasma generated by laser irradiation of a spray of droplets.

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Section: Limitations Of the Modelmentioning

confidence: 99%

Numerical study of nanosecond laser interactions with micro-sized single droplets and sprays of xenon

Auguste

Dortan

Ceccotti

et al. 2007

Journal of Applied Physics

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“…Next generation high-power laser systems are expected to routinely reach intensities in the I ≈ 10 22 − 10 23 W/cm 2 region [1,2,3,4]. In a configuration where such an intense pulse interacts with a solid target, gamma rays will be generated mostly by the processes of electron-nucleus bremsstrahlung [5], and by radiation reaction effects including non-linear inverse Compton scattering (ICS) [6,7], where the fast electrons scatter on the high field of the laser pulse itself [8]. In this paper, we present a study of the latter process, relevant especially at the higher end of the considered intensity range, where the radiation has to be treated in the context of quantum electrodynamics (QED), with the further outlook of even higher intensities which would exhibit additional important effects such as the creation of electron-positron pairs and QED cascades [9,10,11,12,13,14,15,16].…”

Section: Introductionmentioning

confidence: 99%

Inverse Compton scattering from solid targets irradiated by ultra-short laser pulses in the $10^{22}-10^{23}\,\mathrm{W/cm^2}$ regime

Vyskočil,

Gelfer,

Klimo

2019

Preprint

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Emission of high energy gamma rays via the non-linear inverse Compton scattering process (ICS) in interactions of ultra-intense laser pulses with thin solid foils is studied using particle-in-cell simulations. It is shown that the angular distribution of the ICS photons has a forward-oriented two-directional structure centred at an angle ϑ = ±30 • , a value predicted by a theoretical model based on a standing wave approximation to the electromagnetic field in front of the target, which only increases at the highest intensities due to faster hole boring, which renders the approximation invalid. The conversion efficiency is shown to exhibit a super-linear increase with the driving pulse intensity. In comparison to emission via electron-nucleus bremsstrahlung, it is shown that the higher absorption, further enhanced by faster hole boring, in the targets with lower atomic number strongly favours the ICS process.

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“…As a result of the interaction of nanosecond pulses of laser radiation with matter, for power densities of radiation higher that 10 12 Wcm~2, a high-temperature plasma is produced with a maximum temperature of the order of 10 6 K (a laser plasma) that is an intensive source of soft X rays, including the low-energy part of a spectrum with the photon energy around 1 keV (Bernstein & Comisar 1970;Colombant & Tonon 1973;Nagel et al 1974). For this reason a laser-produced plasma is used in the systems of laser plasma X-ray sources (Wallis 1980;Key 1984;Nagel 1986;Gerritsen etal.…”

Section: Introductionmentioning

confidence: 99%

Generation of nanosecond soft X-ray pulses as a result of interaction of the Nd: glass laser radiation with gas puff targets

Fiedorowicz¹,

Bartnik²,

Patron³

et al. 1994

Laser Part. Beams

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A new method of generation of nanosecond soft X-ray pulses with a photon energy around 1 keV is presented. X-rays are generated in a high-temperature plasma, which is created as a result of the interaction of Ndrglass laser radiation with a gas puff target. The target was obtained by puffing a small amount of gas through the nozzle into the vacuum chamber by means of a pressure electromagnetic valve. The pulses of laser radiation, with pulse duration of 1 ns and energy up to 15 J, generated in the system of a high-power Nd:glass laser were used for the target heating. Spatial, spectral, and temporal measurements of X-ray emission have shown that the high-intensity soft X rays are generated as a result of the interaction of nanosecond pulses of Nd:glass laser radiation with the gas puff target. A high efficiency of X-ray generation is suggested to be related to the effect of condensation of the gas outflowing from the valve nozzle and, in effect, to the interaction of laser radiation with matter in a form of aerosol.

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X-Ray Production in Laser-Heated Plasmas

Cited by 32 publications

References 15 publications

Numerical study of nanosecond laser interactions with micro-sized single droplets and sprays of xenon

Numerical study of nanosecond laser interactions with micro-sized single droplets and sprays of xenon

Inverse Compton scattering from solid targets irradiated by ultra-short laser pulses in the $10^{22}-10^{23}\,\mathrm{W/cm^2}$ regime

Generation of nanosecond soft X-ray pulses as a result of interaction of the Nd: glass laser radiation with gas puff targets

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