Study of x-rays produced from debris-free sources with Ar, Kr and Kr/Ar mixture linear gas jets irradiated by UNR Leopard laser beam with fs and ns pulse duration

Kantsyrev, V.L.; Schultz, K.A.; Shlyaptseva, V. V.; Safronova, A.S.; Shrestha, I.; Petrov, G. M.; Moschella, J.J.; Petkov, E.E.; Stafford, A.; Cooper, M.C.; Weller, M. E.; Cline, W.; Wiewiór, P.; Chalyy, O.

doi:10.1016/j.hedp.2016.02.001

Cited by 5 publications

(6 citation statements)

References 31 publications

(35 reference statements)

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“…For example, our observations in 2-5 keV region at 10 19 W/cm 2 have already shown that the Xe/Kr/Ar source (with Xe concentration lower than 15 %) covers at least the 2.2 -4.6 keV field, and Kr/Ar source covers the 2.2-3 keV field [9]. For comparison, pure Ar source radiates strong line spectra near 3.1 -3.2 keV [9], and pure Kr source covers a range of 2.2-2.4 keV [9].…”

Section: X-ray Emission Study From Linear Jets Irradiated By Sub-pmentioning

confidence: 63%

“…This fact needs additional interpretation in future work. Previously, it was determined that Ar does not cluster in mixtures with Kr [9]; it is also postulated that in the Xe/Kr/Ar mixtures, Xe and Kr cluster independently of each other. The estimation of the maximum conversion coefficient of laser energy to x-rays in the 1.4-3.5 keV spectral region indicated that for the Xe/Kr/Ar mixture it is on the order of ε > 3 x 10 -4 .…”

Section: Discussionmentioning

confidence: 99%

“…Note that during preliminary experiments, it was found that maximum x-ray yield corresponds to a 1 mm distance between the focus of laser beam and the exit of the linear nozzle [9].…”

Section: Methodsmentioning

confidence: 99%

“…The non-LTE Collisional Radiative (CR) model for Kr [9] was used for identification of Kr lines and estimation of plasma parameters. For L-shell Kr plasmas from gas mixture XeKrArI, we calculated an electron temperature and density T e =450 eV and n e =10 21 cm -3 , respectively (same as was observed in [9] for 15%Kr/85%Ar jet plasma). Similar results were obtained for XeKrArII jet plasma.…”

Section: X-ray Emission Study From Linear Jets Irradiated By Sub-pmentioning

confidence: 99%

“…In many experiments it was demonstrated that when pure Ar [4,5], Kr [6], Xe [7,8], or a Kr/Ar [9] mixture, irradiated by fs laser pulses with wavelength near 1 μm, the gas/cluster jets become efficient x-ray sources. In this work we show that Xe/Kr/Ar mixture jets generate more powerful x-ray bursts and in a broader spectral range.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Xe and Kr impurities on x-ray yield from debris-free plasma x-ray sources with an Ar supersonic gas jet irradiated by femtosecond near-infrared-wavelength laser pulses

et al. 2016

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Abstract. Many aspects of physical phenomena occurring when an intense laser pulse with sub-ps duration and an intensity of 10 18 -10 19 W/cm 2 heats an under-dense plasma in a supersonic cluster/gas jet were studied to determine the relative contribution of thermal and non-thermal processes to soft and hard x-ray emission from debris-free plasmas.Experiments were performed at the University of Nevada Reno (UNR) Leopard laser operated with a 15 J / 350 fs pulse and different pulse contrasts (10 7 or 10 5

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Section: X-ray Emission Study From Linear Jets Irradiated By Sub-pmentioning

confidence: 63%

Section: Discussionmentioning

confidence: 99%

“…Note that during preliminary experiments, it was found that maximum x-ray yield corresponds to a 1 mm distance between the focus of laser beam and the exit of the linear nozzle [9].…”

Section: Methodsmentioning

confidence: 99%

Section: X-ray Emission Study From Linear Jets Irradiated By Sub-pmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of Xe and Kr impurities on x-ray yield from debris-free plasma x-ray sources with an Ar supersonic gas jet irradiated by femtosecond near-infrared-wavelength laser pulses

et al. 2016

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Study of pure and mixed clustered noble gas puffs irradiated with a high intensity (7 × 1019 W/cm2) sub-ps laser beam and achievement of a strong X-ray flash in a laser-generated debris-free X-ray source

et al. 2019

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We present a broad study of linear, clustered, noble gas puffs irradiated with the frequency doubled (527 nm) Titan laser at Lawrence Livermore National Laboratory. Pure Ar, Kr, and Xe clustered gas puffs, as well as two mixed-gas puffs consisting of KrAr and XeKrAr gases, make up the targets. Characterization experiments to determine gas-puff density show that varying the experimental parameter gas-delay timing (the delay between gas puff initialization and laser-gas-puff interaction) provides a simple control over the gas-puff density. X-ray emission (>1.4 keV) is studied as a function of gas composition, density, and delay timing. Xe gas puffs produce the strongest peak radiation in the several keV spectral region. The emitted radiation was found to be anisotropic, with smaller X-ray flux observed in the direction perpendicular to both laser beam propagation and polarization directions. The degree of anisotropy is independent of gas target type but increases with photon energy. X-ray spectroscopic measurements estimate plasma parameters and highlight their difference with previous studies. Electron beams with energy in excess of 72 keV are present in the noble gas-puff plasmas and results indicate that Ar plays a key role in their production. A drastic increase in harder X-ray emissions (X-ray flash effect) and multi-MeV electron-beam generation from Xe gas-puff plasma occurred when the laser beam was focused on the front edge of the linear gas puff.

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Characterization of pure and mixed Ar, Kr and Xe gas jets generated by different nozzles and a study of X-ray radiation yields after interaction with a sub-ps laser pulse

et al. 2016

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Gas jets accelerated through a linear supersonic and a conical nozzle, comprising a monomer/cluster mix, were characterized at UNR using a Mach-Zehnder type interferometer and Rayleigh scattering. A comparison of the two nozzle types is presented, showing that the linear nozzle produces gas jets of an order of magnitude denser than the conical nozzle. The linear gas jets of Ar, Kr, and Xe as well as triple mixtures with different percentages of each of the aforementioned gases were characterized. The densest gas jets used Ar as the target gas, while the least dense jets came from Kr. Cluster radii of the pure gases were measured, and Xe gas jets were found to produce the largest gas clusters. A study of X-ray generation by gas jet-laser plasma was performed at the UNR Leopard laser (1.057 μm, 350 fs, ∼1019 W/cm2) on the linear nozzle. The gas jets were irradiated with a high-intensity sub-ps laser pulse. An absolute X-ray output of the laser-gas jet interactions measured by the calibrated PCDs is presented and show that triple mixtures of Xe, Kr, and Ar each exhibited a higher X-ray yield compared to the pure gases. A strong anisotropy of X-ray radiation with respect to laser beam polarization direction is observed in all the gas jets. In fact, this anisotropy is different in three spectral regions (>1.4, 3.5 and 9 keV).

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Study of x-rays produced from debris-free sources with Ar, Kr and Kr/Ar mixture linear gas jets irradiated by UNR Leopard laser beam with fs and ns pulse duration

Cited by 5 publications

References 31 publications

Influence of Xe and Kr impurities on x-ray yield from debris-free plasma x-ray sources with an Ar supersonic gas jet irradiated by femtosecond near-infrared-wavelength laser pulses

Influence of Xe and Kr impurities on x-ray yield from debris-free plasma x-ray sources with an Ar supersonic gas jet irradiated by femtosecond near-infrared-wavelength laser pulses

Study of pure and mixed clustered noble gas puffs irradiated with a high intensity (7 × 1019 W/cm2) sub-ps laser beam and achievement of a strong X-ray flash in a laser-generated debris-free X-ray source

Characterization of pure and mixed Ar, Kr and Xe gas jets generated by different nozzles and a study of X-ray radiation yields after interaction with a sub-ps laser pulse

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