Publications (8)3.77 Total impact
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Article: Optical Spectroscopy of Free‐Propagating Plasma and Its Interaction with Tungsten Targets in PF‐1000 Facility
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ABSTRACT: The paper describes the application of optical spectroscopy methods for investigation of intense plasma streams, which are emitted from the large PF-1000 facility operated at 21-27 kV, 290-480 kJ, as well as for studies of interactions of such streams with tungsten (W) targets. The electron concentration, as estimated from the Stark broadening of the Dβ line recorded at a distance of z = 30 cm from the electrode ends, changed from about 2.2×1016 to 0.5×1016 cm–3 in about 5 µs. Spectroscopic measurements were also carried out in experiments performed with a pure W-target placed at z = 30 cm. There were for the first time in PF-1000 recorded and identified many WI and WII lines. In some cases an analysis of the Dβ line was impossible because of its very strong re-absorption. A quantitative analysis of the W-lines was not performed, but some information about dynamics of the W-ions production was obtained (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)Beiträge aus der Plasmaphysik 03/2011; 51(2‐3):288 - 292. -
Article: Laser induced breakdown spectroscopy as diagnostics for fuel retention and removal and wall composition in fusion reactors with mixed-material components
Fusion Engineering and Design 01/2011; 86(6–8):1239 - 1242. · 1.49 Impact Factor -
Article: Study of plasma produced from deuterized-titanium irradiated by intense laser pulses
Radiation Effects and Defects in Solids 09/2010; 165(6-10):412-418. · 0.40 Impact Factor -
Article: Laser-driven generation of ultraintense proton beams
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ABSTRACT: The results of experimental and numerical studies of high-intensity proton beam generation driven by a short laser pulse of relativistic intensity are reported. In the experiment, a 350 fs laser pulse of 1.06 or 0.53 μm wavelength and intensity up to 2×1019 Wcm−2 irradiated a thin (0.6–2 μm) plastic (PS) or Au/PS (plastic covered by 0.2 μm Au front layer) target along the target normal. The effect of laser intensity, the target structure and the laser wavelength on the proton beam parameters and laser-protons energy conversion efficiency were examined. Both the measurements and one-dimensional particle-in-cell simulations showed that MeV proton beams of intensity 1018 Wcm−2 and current density 1012 Acm−2 at the source can be produced when the laser intensity-wavelength squared product I Lλ2 is 1019 Wcm−2 μm2 and the laser-target interaction conditions approach the skin-layer ponderomotive acceleration (SLPA) requirements. The simulations also proved that at I Lλ2≥slant 5×1019 Wcm−2 μm2 and λ≤slant 0.53 μm, SLPA clearly prevails over other acceleration mechanisms and it can produce multi-MeV proton beams of extremely high intensities above 1020 Wcm−2.Radiation Effects and Defects in Solids 09/2010; 165(6-10):760-766. · 0.40 Impact Factor -
Article: Study of laser-induced removal of co-deposits from tokamak plasma-facing components using ion diagnostics and optical spectroscopy
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ABSTRACT: The paper presents studies of the application of ion diagnostics and optical spectroscopy for on-line measurement of the amount and characteristics of co-deposits from the laser-ablated surface of the plasma-facing components (e.g. graphite tiles). For removal of the co-deposit layer a repetitive Nd:YAG laser was used. Determination of the characteristics of ions emitted from the laser-illuminated targets was performed using ion collectors (on the basis of a time-of-flight method) and an optical spectrometer. The main ion stream parameters and spectral lines of deuterium and carbon or tungsten ions were measured depending on laser pulse parameters. The research proved that optical spectroscopy could be a convenient method for on-line observation of the co-deposited layer removal by means of laser ablation. In combination with the investigation of collected co-deposit dust, the performed study made it possible to state that laser-induced breakdown spectroscopy can be useful as a diagnostic method for the ablative co-deposited layer removal and the wall conditioning. The properties of modified surfaces of samples and collected dust (evaporated co-deposit) were determined using different measuring methods.Radiation Effects & Defects in Solids: Incorporating Plasma Science & Plasma Technology. 06/2010; 165(6-10):434-440. -
Article: Characterisation of laser-produced tungsten plasma using optical spectroscopy method
The European Physical Journal D 03/2009; 54(2):463-466. · 1.48 Impact Factor -
Article: Spectroscopy of the tungsten plasma produced by pulsed plasma-ion streams or laser beams
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ABSTRACT: The paper reports on experiments, which concerned studies of plasma produced from a tungsten (W) target bombarded by powerful (ca. 5 μs, 1–5 MW/cm2) plasma-ion streams in RPI-IBIS plasma accelerator, and a similar target irradiated with intense Nd:YAG laser pulses (0.5 J, 3 ns, ca. 5.3 × 109 W/cm2) in another vacuum chamber. In both experiments optical measurements were performed with a Mechelle®900 spectrometer, which enabled the spectrum from 300 nm to 1100 nm to be recorded, and different WI- and WII-lines to be identified. From space- and time-resolved measurements of those lines, basic W-plasma parameters were estimated. During W-plasma expansion the electron temperature was found to be 0.8–1 eV and electron concentration (2–8) × 1016 cm−3. The emission of higher-ionized W-ions (up to W+6) was confirmed by measurements with an ion-energy analyzer. Structural changes in the irradiated targets were investigated with an optical microscope and SEM.Journal of Nuclear Materials. -
Article: Application of solid-state nuclear track detectors of the CR-39/PM-355 type for measurements of energetic protons emitted from plasma produced by an ultra-intense laser
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ABSTRACT: The paper reports on applications of solid-state nuclear track detectors (SSNTDs) of the CR-39/PM-355, manufactured by Pershore Moulding Ltd., for measurements of fast protons emitted from laser-produced plasma. The experiment was performed at LULI, Ecole Politechnique, on the 100 Tera-Watt laser facility. A 1.05 μm laser pulse of 350 fs duration and intensity up to 2 × 1019 W/cm2 irradiated a thin (1–3 μm) polystyrene (PS) or Au/PS target (PS foil covered with a 0.1–0.2 μm Au layer) along the target normal. The measurements revealed that very intense MeV proton beams can be produced under specially chosen laser-target irradiation conditions. The proton beam characteristics were measured using the TOF method (ion collectors), SSNTDs, and radiochromic films (RCFs). The SSNTDs appeared to be especially useful for the experimental analysis of more energetic protons (Ep > 3 MeV). Using in the same laser shots many detector samples covered with Al foils of different thicknesses (from 15 μm up to 400 μm) it was possible to estimate energy spectra of protons emitted under various irradiation conditions. The most energetic protons (of energy up to 10 MeV) and the most intense proton beams were generated from a double-layer Au/PS target.Radiation Measurements.
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Institutions
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2010–2011
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Institute of Plasma Physics and Laser Microfusion
Warsaw, Masovian Voivodeship, Poland
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