L. Ryć

Institute of Plasma Physics and Laser Microfusion

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P. Parys

Institute of Plasma Physics and Laser Microfusion

J. Krása

Czech Academy of Sciences, Institute of Physics

J. Wołowski

Institute of Plasma Physics and Laser Microfusion

J. Ullschmied

Czech Academy of Sciences, Institute of Plasma Physics

M. Pfeifer

Graz University of Technology

J. Badziak

Institute of Plasma Physics and Laser Microfusion

L. Láska

Czech Academy of Sciences, Institute of Physics

L. Torrisi

University of Messina

M. Rosiński

Institute of Plasma Physics and Laser Microfusion

K. Rohlena

Czech Academy of Sciences, Institute of Physics

Cooperative Institutions

Max Planck Institute for Plasma Physics

551

Max Planck Society

488

Max Planck Institute for Plasma Physics - Greifswald

475

Forschungszentrum Jülich

161

Culham Science Centre

154

Princeton Plasma Physics Laboratory

147

CEA Cadarache

123

National Institute for Fusion Science

119

Oak Ridge National Laboratory

112

Royal Military Academy

109

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Measurement of ion emission from plasmas obtained with a 600 fs KrF laser

Physica Scripta (2014)

L. Ryć A. Barna L. Calcagno I Földeş P. Parys

Ion emission from plasmas obtained by the use of a 600 fs, 36 mJ KrF laser operating at 248 nm was measured and analysed for a variety of targets at different laser intensities. The intensity was set by changing the distance between the focusing lens and the target. It was found that the ions emitted originate from impurities and ions from the bulk of the target can be produced only in the subsequent shots. Proton emission was identified from some targets, but the energy of the protons was low (less than 12 keV). A new silicon carbide semiconductor detector proved to be applicable for the collection of the ions.

10.1088/0031-8949/2014/t161/014032

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Citations (3)

Generation of Secondary Particles From Subnanosecond Laser Irradiation of Targets at Intensities of <formula formulatype="inline"><tex Notation="TeX">$10^{16}~{\rm W}~{\rm cm}^{-2}$</tex></formula>

IEEE Transactions on Plasma Science (2013)

J. Krása D. Margarone D. Klír A. Velyhan A. Picciotto

Emission of several tens of ${\rm mA}/{\rm cm}^{2}$ currents carried by MeV-protons is reported for plasmas produced by a beam of the 3-TW kJ-class Prague Asterix Laser System (PALS) focused onto foil targets of various thicknesses. The maximum proton energy of 4.2 MeV is observed at a modest irradiance $(I{\lambda}^{2}\sim 2\times 10^{16}~{\rm W}~{\rm cm}^{-2}\mu{\rm m}^{2})$ . According to the maximum ion energy scaling $E_{M}\sim (I{\lambda}^{2})^{0.4}$ found for picosecond lasers such a value should be reached at $I{\lambda}^{2}\sim 3\times 10^{18}~{\rm W}~{\rm cm}^{-2}~\mu{\rm m}^{2}$ . Enhancement of the maximum proton energy can be explained by nonlinear interaction of the PALS laser beam with the generated plasma. Nonlinear effects also result in enhancement in the yield of fusion neutrons from ${\rm CD}_{2}$ plasma. The obtained yield of $4\times 10^{5}$ DD-neutrons per laser energy is comparable to those obtained by the use of ps- and fs-lasers irradiating targets with $I{\lambda}^{2}\sim 10^{19}~{\rm W}~{\rm cm}^{-2}~\mu{\rm m}^{2}$ .

10.1109/tps.2013.2254134

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Citations (3)

Three-Hump Curve of Laser X-Ray Emission vs. Varied Focusing Conditions

AIP conference proceedings (2006)

L. Ryć

Three‐hump curve of laser x‐ray emission in dependence on the target‐lens distance has been found at irradiating a Cu target with 240‐J, 0.4‐ns laser pulses. This type of dependence is explained as a result of superposition of “soft” and “hard” components coming from two different mechanisms of radiation production.

Soft X-rays

10.1063/1.2168847

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Citations (1)

Conceptual design of multi-foils system for stellarator W7-X

T. Fornal M. Kubkowska Jacek Kaczmarczyk S. Jabłoński W. Figacz

Source

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Spectral and spatial measurements of a laser-produced plasma EUV source for 13.5 nm based on a double stream Xe/He gas puff target

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2005)

R. Rakowski Andrzej Bartnik Henryk Fiedorowicz R. Jarocki J. Kostecki

The results of the spectral and spatial measurements of a laser-produced (LPP) plasma source of extreme ultraviolet (EUV) for 13.5 nm are presented. The double stream Xe/He gas puff target in the source was utilizing. The source was equipped with a Nd: YAG laser system (E = 0.55 J, t = 3.9 ns, f = 10 Hz, M² = 2.5) and was dedicated to EUV metrology purposes. An advantage of this approach of the laser-plasma source is a debris free EUV emission. For the spectral research a transmission grating spectrograph (TGS) and a grazing incidence spectrograph (GIS) were utilized. For spatial measurements a pinhole camera was employed. The influence on EUV emission of the laser focal spot position in relation to the gas puff target and the time delays between opening valves and the laser pulse were investigated.

Extreme Ultraviolet Lithography

Extreme ultraviolet

10.1117/12.622218

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Influence of laser focal position on X-ray and ion emission of copper plasma

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (2011)

S. Chaurasia S. Tripathi L. Ryć L. J. Dhareshwar

10.1016/j.nima.2011.02.050

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Abrupt Change in X-ray and Ion Emission of the PALS Laser Plasma at Laser Intensity of ∼10[sup 15] W∕cm[sup 2]

AIP conference proceedings (2008)

L. Ryć J. Krása L. Láska P. Parys K. Rohlena

In the paper we summarise and compare the original data concerning x-ray and ion emission obtained in some laser experiments on the PALS laser system, Prague, which were carried out using different targets and laser energy. Typical patterns of changing the x-ray and the ion emission in dependence on the state of laser beam focusing are presented and discussed. Radical changes in x-ray, ion emission and crater formation are observed in the vicinity of best focus when laser intensity exceeds the level of about ×1014 Wcm−2. Some practical conclusions concerning the use of x-ray and ion diagnostics in the experiments at high laser energy and the condition of high laser beam focusing are drawn out.

10.1063/1.2909139

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The effect of high-Z dopant on laser-driven acceleration of a thin plastic target

Applied Physics Letters (2008)

J. Badziak A. Kasperczuk P. Parys T. Pisarczyk M. Rosiński

Acceleration of a thin (10 or 20μm) plastic foil by 120J, 0.438μm, 0.3ns laser pulse of intensity up to 1015W∕cm2 has been investigated. It is shown that the introducing a high-Z dopant to the foil causes an increase in the ablating plasma density, velocity, and collimation which, in turn, results in a remarkably higher kinetic energy and energy fluence of the flyer foil.

Collimated light

10.1063/1.2920705

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Application of laser-induced double ablation of plasma for enhanced macroparticle acceleration

Journal of Physics Conference Series (2008)

J. Wołowski J. Badziak A. Borrielli L. J. Dareshwar I Földeş

The objective of the studies was to demonstrate that using laser-induced double plasma ablation (created by the laser light and the X-rays from a high-Z dopant introduced to a low-Z target) it is possible to increase significantly the kinetic energy of a macroparticle accelerated by a laser. In the experiments, the high-intensity (1014 — 1015W/cm2), high-energy (up to 120J) sub-ns 3ω beam of the PALS laser interacted with various (with and without high-Z dopant) thin foil targets. The laser-driven foil (the 'macroparticle') collided with a massive (A1) target producing crater, the volume of which was a measure of the foil kinetic energy released to the foil. Parameters of the accelerated foil and the ablated plasma were determined using three-frame interferometry, ion diagnostics, soft and hard X-ray diagnostics as well as the measurements of the crater dimensions. The results of investigations for low-Z foil targets; for undoped (homogenous) and for ones with high-Z dopants, were compared. It was found that the X-ray yield from the foil target with high-Z dopant is a few times higher than that from the undoped target and the ablating plasma flow is faster and more collimated. It results in an increase in kinetic energy of the accelerated foil (the crater volume is up to 80% larger) provided that the foil is sufficiently thick (20μm). Higher increase in the kinetic energy seems to be possible when using foils with a higher amount of a high-Z dopant and the foil thickness is well matched to the laser beam parameters.

Laser Ablation

10.1088/1742-6596/112/2/022072

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Citations (1)

<title>Metal resistor bolometer on GaAs substrate</title>

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2006)

Petr Macháč L. Ryć

A metal resistor bolometer for the detection of x-ray emission from laser plasma has been designed and fabricated. The bolometer is placed on a thin polymeric foil with the use of thin film technology. The foil is suspended on a GaAs substrate. The Au/Pt/Ti thin film resistor of 2000 Ω resistance and 0.19 %/K temperature coefficient is used for sensing temperature. A detection head equipped with the bolometer and accompanying read-out electronics has been fabricated and used in a plasma experiment.

Temperature coefficient

10.1117/12.675640

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