A5101995942- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- History and Developments in Astronomy
- Astronomical Observations and Instrumentation
- Laser-Matter Interactions and Applications
- Radiation Detection and Scintillator Technologies
- Ion-surface interactions and analysis
- Adaptive optics and wavefront sensing
- Atomic and Subatomic Physics Research
- Pulsed Power Technology Applications
- Diamond and Carbon-based Materials Research
- Gamma-ray bursts and supernovae
- Metal and Thin Film Mechanics
- Magnetic confinement fusion research
- Gyrotron and Vacuum Electronics Research
- Analytical chemistry methods development
- Plasma Diagnostics and Applications
- Astrophysics and Star Formation Studies
- Fusion and Plasma Physics Studies
- Laser Design and Applications
- Advancements in Photolithography Techniques
Changchun University of Science and Technology
2024
Kano State Polytechnic
2024
Lawrenceville Plasma Physics (United States)
2017-2023
Hellenic Mediterranean University
2008-2019
FORTH Institute of Mediterranean Studies
2019
Nanyang Technological University
2006-2017
Boston Fusion (United States)
2017
Centre for Technological Research of Crete
2014-2016
Purdue University West Lafayette
2011-2016
Crete University Press
2014
We report experimental evidence for a Rayleigh-Taylor-like instability driven by radiation pressure of an ultraintense (${10}^{21}\text{ }\text{ }\mathrm{W}/{\mathrm{cm}}^{2}$) laser pulse. The is witnessed the highly modulated profile accelerated proton beam produced when irradiates 5 nm diamondlike carbon (90% C, 10% H) target. Clear anticorrelation between bubblelike modulations and transmitted further demonstrate role in modulating foil. Measurements modulation wavelength, acceleration...
An all-optical approach to laser-proton acceleration enhancement is investigated using the simplest of target designs demonstrate application-relevant levels energy conversion efficiency between laser and protons. Controlled deposition energy, in form a double-pulse temporal envelope, combination with thin foil targets which recirculation laser-accelerated electrons can lead optimal conditions for coupling drive into proton beam. This shown deliver substantial 5–30 MeV protons, compared...
The expansion of electromagnetic postsolitons emerging from the interaction a 30 ps, $3\ifmmode\times\else\texttimes\fi{}{10}^{18}\text{ }\text{ }\mathrm{W}\text{ }{\mathrm{cm}}^{\ensuremath{-}2}$ laser pulse with an underdense deuterium plasma has been observed up to 100 ps after propagation, when large numbers were seen remain in plasma. temporal evolution accurately characterized high spatial and resolution. is compared analytical models three-dimensional particle-in-cell results,...
We have investigated plasma stagnation and interaction effects in colliding laser-produced plasmas. For generating plasmas, two split laser beams were line-focused onto a hemi-circular target the seed plasmas so produced allowed to expand mutually orthogonal directions. This experimental setup forced expanding come focus at center of chamber. The interpenetration candidate fusion wall materials, viz., carbon tungsten, other aluminum, molybdenum this study. Fast-gated imaging, Faraday cup ion...
Abstract LPPFusion is developing a source of fusion energy using the dense plasma focus device and p-B 11 fuel, combination we call Focus Fusion. So far, this project has led to achievement highest confined ion energies any experiment (> 200 keV) as well as, recently, lowest impurities plasma. Among privately-funded efforts, our experiments have achieved ratio generation input (wall-plug efficiency) nτT product 3.4 × 10 20 keV-s/m 3 . Our calculations simulations indicate that quantum...
Electron beam emission characteristics from neon, argon, hydrogen and helium in an NX2 dense plasma focus (DPF) device were investigated order to optimize the for deposition of thin films using energetic electron beams. A Rogowski coil CCD based magnetic spectrometer used obtain temporal characteristics, total charge energy distributions DPF device. It is found that should be first choice film as it produces highest higher (from 50 200 keV) electrons. Neon next best gives with mid-energy 30...
Abstract We investigated the expansion dynamics of laser-produced plasmas expanding into an axial magnetic field. Plasmas were generated by focusing 1.064 μm Nd:YAG laser pulses onto a planar tin target in vacuum and allowed to expand 0.5 T field where lines aligned along plume direction. Gated images employing intensified charge-coupled device showed plasma plume, which also compared with results, obtained using particle-in-cell modeling methods. The estimated density temperature plumes...
In recent years, the effort to develop practical fusion energy has rapidly evolved from a focus on only tokamak and laser inertial devices include wide array of approaches. We survey this increasingly diverse set routes assess what approaches are likely lead with least outlay resources thus potentially fastest routes. While conclusive answer can be determined once some approach actually succeeds in producing fusion-energy generator, speed advance depends allocation resources, it is possible...
We report the observations of pinching in a miniature plasma focus (PF) (58—160 J) operated repetitive mode using fast pseudospark switch (PSS). The size device, which includes capacitor bank, PSS and chamber, is order 22 cm × 38 cm. Several diagnostic tools, gated imager, streak camera, current voltage probe, are employed simultaneously to confirm occurrence this PF device. device optimized for operation neon hydrogen as working gas. best formation was obtained at pressures between 0.5 8.0...
We investigated the role of a guiding magnetic field on extreme ultraviolet (EUV) and ion emission from laser produced Sn plasma for various pulse duration intensity. For producing plasmas, planar slabs pure were irradiated with 1064 nm, Nd:YAG pulses varying (5–15 ns) A trap was fabricated use two neodymium permanent magnets which provided strength ∼0.5 T along plume expansion direction. Our results indicate that EUV conversion efficiency do not depend significantly applied axial field....
We investigated the role of laser pulse duration and intensity on extreme ultraviolet (EUV) generation ion emission from a produced Sn plasma. For producing plasmas, planar slabs pure were irradiated with 1064 nm Nd:YAG pulses varying (5–20 ns) intensity. Experimental results performed at CMUXE indicate that conversion efficiency (CE) EUV radiation strongly depend width intensity, maximum CE ∼2.0% measured for shortest used (5 ns). Faraday Cup analysis plasma showed flux kinetic profiles are...
Experiments show that the performance of plasma focus (PF) depends on several macroscopic parameters like energy capacitor bank, current, voltage, electrodes dimension, and curvature current sheath in axial phase. Recent work (IEEE Trans. Plasma Sci., vol. 24, no. 3, pp. 1101-1105, 1996) shows overriding dependence individual listed above is a combined parameter called drive or speed S=(I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">p</sub>...
The experimental study of the behavior deuterium plasma with densities between 2×1018 and 2×1020 cm−3, subjected to a 6 TW, 30 ps, 3×1018 W cm−2 laser pulse, is presented. Conclusive proof that single straight channel generated when pulse interacts lowest provided. This shows no small-scale longitudinal density modulations, extends up 2 mm in length persists for 150 ps after peak interaction. Bifurcation 1 propagation distance observed first time. For higher interactions, above relativistic...
To reduce impurities in the dense plasma focus FF-1 device, we used monolithic tungsten electrodes with pre-ionization. With this new set-up, demonstrated a three-fold reduction of by mass and ten-fold ion number. produced 50% increase fusion yield over our previous copper electrodes, both for single shot mean ten consecutive shots same conditions. These results represent doubling as compared any other device 60 kJ energy input. In addition, single-shot record 240 ± 20 keV energy, confined...
Laser-produced colliding plasmas have numerous attractive applications, and the stagnation layer formed during collisions between is a useful system for understanding particle molecular formation in controlled way. In this article, we explore carbon dimer its evolutionary paths interaction of two laser-produced plasmas. Colliding are generated by splitting laser beam into sub-beams then focusing them either single flat graphite target (laterally plasmas) or V-shaped (orthogonally plasmas)....
Iron oxide nanostructures with significantly fewer droplets were successfully synthesized by pulsed laser deposition using a special target–substrate geometry, which is coined backward plume deposition. The morphology of deposited for found to be strongly controlled the ambient gas pressure and changes from thin film an assemble nanoclusters loosely bound floccule-like network increase in pressure. post-annealing considerably structural properties materials, determined magnetite FCC-Fe3O4....
The design and construction of a pulsed plasma focus device to be used as portable neutron source for material analysis such explosive detection using gamma spectroscopy is presented. capable operating at repetitive rate few Hz. When deuterium gas used, up 10 5 neutrons per shot are expected produced with temporal pulse width tens nanoseconds. operation the its size main advantage in comparison existing continuous sources. Parts include electrical charging unit, capacitor bank, spark switch...
We report the design and development of a high repetition rate pseudospark trigger generator for operating switches with low impedance approximately 50Ω between pins. The can be operated from single-shot mode up to 1kHz. It produces 3kV, 1μs pulses into 100Ω load single gap. Also, addition self-break spark gap pulse forming network, used jitter. In this configuration, it 300ns, 3kV rise time 10ns. jitter applied is less than 1ns.
We investigated the effects of laser excitation wavelength on water-window emission lines laser-produced boron-nitride plasmas. Plasmas are produced by focusing 1064 nm and harmonically generated 532 266 radiation from a Nd:YAG BN target in vacuum. Soft x-ray region recorded using grazing-incidence spectrograph. Filtered photodiodes used to obtain complementary data for intensity angular dependence. Spectral changes nitrogen Ly-α He-α show how affects emission. Our results that relative...