We present results exploring various methods of aluminum flyer acceleration. One method uses the ... more We present results exploring various methods of aluminum flyer acceleration. One method uses the shock wave generated by underwater electrical explosions of thin foils supplied by a pulse generator with stored energy of ∼4.7 kJ. Utilizing the shock created by an exploding foil, a maximal free flyer velocity of ∼2000 m/s is obtained. This acceleration method is compared to results exploiting only magnetic pushing to accelerate flyers using a common strip-line configuration, resulting in much lower velocities of ∼300 m/s. We also present a modified strip-line configuration, for which a significant increase in the flyer velocity to ∼1200 m/s is measured. Finally, a hybrid strip configuration, incorporating both the effects of magnetic pushing and acceleration by exploding foil and its subsequent shock wave, results in ∼1400 m/s flyer velocity. These experimental results are analyzed by numerical simulations and analytical modeling of the conservation equations of mass and momentum.
We present a new technique for the investigation of shock-driven hydrodynamic phenomena in gases,... more We present a new technique for the investigation of shock-driven hydrodynamic phenomena in gases, liquids, and solids in arbitrary geometries. The technique consists of a pulsed power-driven resistive wire array explosion in combination with multi-MHz synchrotron radiography. Compared to commonly used techniques, it offers multiple advantages: (1) the shockwave geometry can be shaped to the requirements of the experiment, (2) the pressure ( P > 300 MPa) generated by the exploding wires enables the use of liquid and solid hydrodynamic targets with well-characterized initial conditions (ICs), (3) the multi-MHz radiography enables data acquisition to occur within a single experiment, eliminating uncertainties regarding repeatability of the ICs and subsequent dynamics, and (4) the radiographic measurements enable estimation of compression ratios from the x-ray attenuation. In addition, the use of a synchrotron x-ray source allows the hydrodynamic samples to be volumetrically characte...
Experimental and magnetohydrodynamic numerical simulation results and analysis of a μs- and sub-... more Experimental and magnetohydrodynamic numerical simulation results and analysis of a μs- and sub- μs-timescale overdamped underwater electrical explosion of copper wires having different lengths and diameters are presented. For these explosions, ∼80% of the energy stored in the pulse generator is deposited into the wire during a time comparable or shorter than a quarter period of the underdamped discharge. It was found that the threshold values of the deposited energy density, energy density rate, and energy density per unit area, which satisfy overdamped discharge, depend on the wire parameters and on the timescale of the explosion. It was shown that the mechanism responsible for this is the process during which the wire experiences phase transitions to a low-ionized plasma, the resistivity of which is determined by the electron–neutral collision rate, which, in turn, depends on the wire radial expansion velocity, current density, and temperature.
2016 IEEE International Conference on Plasma Science (ICOPS), 2016
Summary form only given. Experimental studies of a spherical converging shock wave (SW) interacti... more Summary form only given. Experimental studies of a spherical converging shock wave (SW) interaction with preliminary formed plasma are presented. The SW was generated by an underwater electrical explosion of a spherical Cu wire array (radius of 15 mm, number of wires of 40, and wire diameter of 0.1 mm) supplied by 240-kA amplitude current pulse with rise time of ~0.8 μs. The plasma was formed by a 40 Pa propane discharge between the cathode and anode electrodes, placed at the distance of 1.5 mm apart, inside of 2 mm inner diameter quartz capillary located at the equatorial plane of the array. The light emission from the plasma was transferred to the inputs of two spectrometers by optical fiber installed from the one side of the capillary and beam splitter with lenses. The spectral lines intensities at the output of spectrometers were recorded prior and during the SW interaction with plasma by intensified framing 4QuikE cameras and by a photomultiplier tube when one of the spectrometers was used as a monochromator. Hα and Hβ spectral lines and line-to-continuum ratios, combined with the ratio of relative intensities of C III/C II and Si III/Si II lines, were used to determine the plasma density and temperature evolution. It was found that during the first -200 ns with respect to the beginning of the plasma compression by the SW, the plasma density increases from 2×1017 cm-3 to 5×1018 cm-3 while the plasma temperature remained almost unchanged, 3-4 eV. Further, following a model of an adiabatically imploding capillary, the plasma density increases >1019 cm-3, resulting in continuum spectrum obtained in the experiment with temperature exceeding 50 eV at radii of compression ≤50 μm.
2020 IEEE International Conference on Plasma Science (ICOPS), 2020
The pulsed power driven explosion of underwater wires arrays is a highly efficient method to prod... more The pulsed power driven explosion of underwater wires arrays is a highly efficient method to produce well controlled, easily shaped shockwaves. Several studies have demonstrated that both cylindrically and spherically convergent shockwaves can be launched into the water surrounding the wires, and on axis these shockwaves are calculated to produce multi-Mbar pressures, and ionization fractions >0.5, ideal for studies of Warm Dense Matter.
2020 IEEE International Conference on Plasma Science (ICOPS), 2020
The observation and analysis of shockwaves generated by the electrical explosion of cylindrical w... more The observation and analysis of shockwaves generated by the electrical explosion of cylindrical wire arrays made of either copper or aluminum wires in water and water-peroxide solutions are reported. Experiments were carried out using a us-timescale/sub-µs-timescale generators delivering ∼370/520 kA pulse with $1.2/0.33\ \mu \mathrm{s}$ rise-time at ∼ 10/17 nH inductive load. In the experiments, almost critically damped or fast decayed under-damped discharges were tested for wire explosions by changing the wire's diameter and keeping the wire's length constant.
Proceedings of International Conference on Particle Accelerators
Structural and engineering designs of the PSR-2000 have been completed on the whole. Stands for i... more Structural and engineering designs of the PSR-2000 have been completed on the whole. Stands for investigating magnetic, vacuum and RF elements as well as some experimental units have also been constructed. In the design, the first stage of realization is determined. It will allow us to obtain a continuous electron beam with an energy of 1.5 GeV and an average
The Synchrotron Light Source ISI-800 at the Ukrainian National Synchrotron Center (Kiev) will be ... more The Synchrotron Light Source ISI-800 at the Ukrainian National Synchrotron Center (Kiev) will be used a 200 mA, 1 GeV electron storage ring to produce high brilliance bending magnet (conventional and superconducting -a combined magnet lattice with TBA cells) and insertion device VUV and X-rays for up 24 ray beamlines. It is 46.73 meters in circumference, including four 3.3 m-long dispersion-free straight sections, and has a beam lifetime designed to exceed more than 3 hours with 5 nTorr average ring vacuum at 200 mA. The harmonic number will be 109 and the corresponding RF frequency will be 699.3 MHz. The critical X-ray wavelength from eight conventional bending magnets will be 2.2 nm and from four superconducting magnets will be 0.3 nm. Further optimization of the storage ring lattice in progress. The major features of the light source ISI-800 are described.
11th International Conference on Magnet Technology (MT-11), 1990
A 3 GeV electron stretcher ring designed at the Kharkov Institute of Physics and Technology is in... more A 3 GeV electron stretcher ring designed at the Kharkov Institute of Physics and Technology is intended for studies in nuclear and elementary particle physics. The magnet lattice is being optimized to produce beams of synchrotron radiation. Main parameters of the magnet elements are given along with the analysis of mechanical and alignment tolerances. Beam injection and extraction systems are briefly outlined, the closed orbit correction system is also described.
Effects of plane undulator sine-lake fields on beam dynamics in storage rings are investigated. E... more Effects of plane undulator sine-lake fields on beam dynamics in storage rings are investigated. Expressions for tune shifts of betatron oscillations versus their amplitudes are obtained for the case. Where the orbit curvature inside the undulator is rather large. It takes place in compact synchrotron light sources with undulator insertions. In the limiting case these expressions for small orbit deflections are coincident with the known relations. Discussion of the results obtained is presented
Recently, a new high energy proton microscopy facility PRIOR (Proton Microscope for FAIR Facility... more Recently, a new high energy proton microscopy facility PRIOR (Proton Microscope for FAIR Facility for Anti-proton and Ion Research) has been designed, constructed, and successfully commissioned at GSI Helmholtzzentrum für Schwerionenforschung (Darmstadt, Germany). As a result of the experiments with 3.5-4.5 GeV proton beams delivered by the heavy ion synchrotron SIS-18 of GSI, 30 μm spatial and 10 ns temporal resolutions of the proton microscope have been demonstrated. A new pulsed power setup for studying properties of matter under extremes has been developed for the dynamic commissioning of the PRIOR facility. This paper describes the PRIOR setup as well as the results of the first static and dynamic proton radiography experiments performed at GSI.
We present results exploring various methods of aluminum flyer acceleration. One method uses the ... more We present results exploring various methods of aluminum flyer acceleration. One method uses the shock wave generated by underwater electrical explosions of thin foils supplied by a pulse generator with stored energy of ∼4.7 kJ. Utilizing the shock created by an exploding foil, a maximal free flyer velocity of ∼2000 m/s is obtained. This acceleration method is compared to results exploiting only magnetic pushing to accelerate flyers using a common strip-line configuration, resulting in much lower velocities of ∼300 m/s. We also present a modified strip-line configuration, for which a significant increase in the flyer velocity to ∼1200 m/s is measured. Finally, a hybrid strip configuration, incorporating both the effects of magnetic pushing and acceleration by exploding foil and its subsequent shock wave, results in ∼1400 m/s flyer velocity. These experimental results are analyzed by numerical simulations and analytical modeling of the conservation equations of mass and momentum.
We present a new technique for the investigation of shock-driven hydrodynamic phenomena in gases,... more We present a new technique for the investigation of shock-driven hydrodynamic phenomena in gases, liquids, and solids in arbitrary geometries. The technique consists of a pulsed power-driven resistive wire array explosion in combination with multi-MHz synchrotron radiography. Compared to commonly used techniques, it offers multiple advantages: (1) the shockwave geometry can be shaped to the requirements of the experiment, (2) the pressure ( P > 300 MPa) generated by the exploding wires enables the use of liquid and solid hydrodynamic targets with well-characterized initial conditions (ICs), (3) the multi-MHz radiography enables data acquisition to occur within a single experiment, eliminating uncertainties regarding repeatability of the ICs and subsequent dynamics, and (4) the radiographic measurements enable estimation of compression ratios from the x-ray attenuation. In addition, the use of a synchrotron x-ray source allows the hydrodynamic samples to be volumetrically characte...
Experimental and magnetohydrodynamic numerical simulation results and analysis of a μs- and sub-... more Experimental and magnetohydrodynamic numerical simulation results and analysis of a μs- and sub- μs-timescale overdamped underwater electrical explosion of copper wires having different lengths and diameters are presented. For these explosions, ∼80% of the energy stored in the pulse generator is deposited into the wire during a time comparable or shorter than a quarter period of the underdamped discharge. It was found that the threshold values of the deposited energy density, energy density rate, and energy density per unit area, which satisfy overdamped discharge, depend on the wire parameters and on the timescale of the explosion. It was shown that the mechanism responsible for this is the process during which the wire experiences phase transitions to a low-ionized plasma, the resistivity of which is determined by the electron–neutral collision rate, which, in turn, depends on the wire radial expansion velocity, current density, and temperature.
2016 IEEE International Conference on Plasma Science (ICOPS), 2016
Summary form only given. Experimental studies of a spherical converging shock wave (SW) interacti... more Summary form only given. Experimental studies of a spherical converging shock wave (SW) interaction with preliminary formed plasma are presented. The SW was generated by an underwater electrical explosion of a spherical Cu wire array (radius of 15 mm, number of wires of 40, and wire diameter of 0.1 mm) supplied by 240-kA amplitude current pulse with rise time of ~0.8 μs. The plasma was formed by a 40 Pa propane discharge between the cathode and anode electrodes, placed at the distance of 1.5 mm apart, inside of 2 mm inner diameter quartz capillary located at the equatorial plane of the array. The light emission from the plasma was transferred to the inputs of two spectrometers by optical fiber installed from the one side of the capillary and beam splitter with lenses. The spectral lines intensities at the output of spectrometers were recorded prior and during the SW interaction with plasma by intensified framing 4QuikE cameras and by a photomultiplier tube when one of the spectrometers was used as a monochromator. Hα and Hβ spectral lines and line-to-continuum ratios, combined with the ratio of relative intensities of C III/C II and Si III/Si II lines, were used to determine the plasma density and temperature evolution. It was found that during the first -200 ns with respect to the beginning of the plasma compression by the SW, the plasma density increases from 2×1017 cm-3 to 5×1018 cm-3 while the plasma temperature remained almost unchanged, 3-4 eV. Further, following a model of an adiabatically imploding capillary, the plasma density increases >1019 cm-3, resulting in continuum spectrum obtained in the experiment with temperature exceeding 50 eV at radii of compression ≤50 μm.
2020 IEEE International Conference on Plasma Science (ICOPS), 2020
The pulsed power driven explosion of underwater wires arrays is a highly efficient method to prod... more The pulsed power driven explosion of underwater wires arrays is a highly efficient method to produce well controlled, easily shaped shockwaves. Several studies have demonstrated that both cylindrically and spherically convergent shockwaves can be launched into the water surrounding the wires, and on axis these shockwaves are calculated to produce multi-Mbar pressures, and ionization fractions >0.5, ideal for studies of Warm Dense Matter.
2020 IEEE International Conference on Plasma Science (ICOPS), 2020
The observation and analysis of shockwaves generated by the electrical explosion of cylindrical w... more The observation and analysis of shockwaves generated by the electrical explosion of cylindrical wire arrays made of either copper or aluminum wires in water and water-peroxide solutions are reported. Experiments were carried out using a us-timescale/sub-µs-timescale generators delivering ∼370/520 kA pulse with $1.2/0.33\ \mu \mathrm{s}$ rise-time at ∼ 10/17 nH inductive load. In the experiments, almost critically damped or fast decayed under-damped discharges were tested for wire explosions by changing the wire's diameter and keeping the wire's length constant.
Proceedings of International Conference on Particle Accelerators
Structural and engineering designs of the PSR-2000 have been completed on the whole. Stands for i... more Structural and engineering designs of the PSR-2000 have been completed on the whole. Stands for investigating magnetic, vacuum and RF elements as well as some experimental units have also been constructed. In the design, the first stage of realization is determined. It will allow us to obtain a continuous electron beam with an energy of 1.5 GeV and an average
The Synchrotron Light Source ISI-800 at the Ukrainian National Synchrotron Center (Kiev) will be ... more The Synchrotron Light Source ISI-800 at the Ukrainian National Synchrotron Center (Kiev) will be used a 200 mA, 1 GeV electron storage ring to produce high brilliance bending magnet (conventional and superconducting -a combined magnet lattice with TBA cells) and insertion device VUV and X-rays for up 24 ray beamlines. It is 46.73 meters in circumference, including four 3.3 m-long dispersion-free straight sections, and has a beam lifetime designed to exceed more than 3 hours with 5 nTorr average ring vacuum at 200 mA. The harmonic number will be 109 and the corresponding RF frequency will be 699.3 MHz. The critical X-ray wavelength from eight conventional bending magnets will be 2.2 nm and from four superconducting magnets will be 0.3 nm. Further optimization of the storage ring lattice in progress. The major features of the light source ISI-800 are described.
11th International Conference on Magnet Technology (MT-11), 1990
A 3 GeV electron stretcher ring designed at the Kharkov Institute of Physics and Technology is in... more A 3 GeV electron stretcher ring designed at the Kharkov Institute of Physics and Technology is intended for studies in nuclear and elementary particle physics. The magnet lattice is being optimized to produce beams of synchrotron radiation. Main parameters of the magnet elements are given along with the analysis of mechanical and alignment tolerances. Beam injection and extraction systems are briefly outlined, the closed orbit correction system is also described.
Effects of plane undulator sine-lake fields on beam dynamics in storage rings are investigated. E... more Effects of plane undulator sine-lake fields on beam dynamics in storage rings are investigated. Expressions for tune shifts of betatron oscillations versus their amplitudes are obtained for the case. Where the orbit curvature inside the undulator is rather large. It takes place in compact synchrotron light sources with undulator insertions. In the limiting case these expressions for small orbit deflections are coincident with the known relations. Discussion of the results obtained is presented
Recently, a new high energy proton microscopy facility PRIOR (Proton Microscope for FAIR Facility... more Recently, a new high energy proton microscopy facility PRIOR (Proton Microscope for FAIR Facility for Anti-proton and Ion Research) has been designed, constructed, and successfully commissioned at GSI Helmholtzzentrum für Schwerionenforschung (Darmstadt, Germany). As a result of the experiments with 3.5-4.5 GeV proton beams delivered by the heavy ion synchrotron SIS-18 of GSI, 30 μm spatial and 10 ns temporal resolutions of the proton microscope have been demonstrated. A new pulsed power setup for studying properties of matter under extremes has been developed for the dynamic commissioning of the PRIOR facility. This paper describes the PRIOR setup as well as the results of the first static and dynamic proton radiography experiments performed at GSI.
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