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Kurth W. S. - One of the best experts on this subject based on the ideXlab platform.
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Quasiperiodic Saturn Auroral Hiss Observed During a Cassini Proximal Orbit
'American Geophysical Union (AGU)', 2020Co-Authors: Menietti, John Douglas, Palmaerts Benjamin, Zahlava J., Averkamp T. F., Groene J. B., Kurth W. S.Abstract:peer reviewedaudience: researcher, professionalSaturn auroral hiss is intense whistler mode emission similar in morphology to terrestrial auroral hiss, and is observed at high latitude very often in quasiperiodic episodes with a period of approximately 1 hr. Bader et al. (2019) report auroral pulsations that may be due to duskside magnetodisk reconnection. The Source of the 1‐hr period is not definitively known but has been purported to be due to second harmonic Alfven waves standing along near planet magnetic field lines (Yates et al., 2016). Observations of auroral hiss at high latitude along Cassini proximal orbits are often excellent, and we have focused on an event for which we have concurrent ultraviolet auroral images as well as electron flux data. A series of repeating auroral hiss episodes is observed to initiate near the magnetic field line that traverses a Saturn kilometric Radiation Source region in each hemisphere, with periodic episodes of hiss recurring at higher L‐shells. Magnetic field lines centered on individual hiss episodes have auroral footprints that lie near and within a region of intense auroral ultraviolet emissions. These observations have a parallel in terrestrial return current electron beam‐generated auroral hiss seen near magnetic field lines supporting auroral kilometric Radiation Source regions. Recent findings link periodic plasma injections with Saturn reconnection sites observed preferentially on the duskside. These injections may spawn Saturn kilometric Radiation Source regions and periodic auroral hiss emission in nearby return current regions
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Quasiperiodic Saturn Auroral Hiss Observed During a Cassini Proximal Orbit
2020Co-Authors: Menietti, John Douglas, Palmaerts Benjamin, Zahlava J., Averkamp T. F., Groene J. B., Kurth W. S.Abstract:Saturn auroral hiss is intense whistler mode emission similar in morphology to terrestrial auroral hiss, and is observed at high latitude very often in quasiperiodic episodes with a period of approximately 1 hr. Bader et al. (2019) report auroral pulsations that may be due to duskside magnetodisk reconnection. The Source of the 1‐hr period is not definitively known but has been purported to be due to second harmonic Alfven waves standing along near planet magnetic field lines (Yates et al., 2016). Observations of auroral hiss at high latitude along Cassini proximal orbits are often excellent, and we have focused on an event for which we have concurrent ultraviolet auroral images as well as electron flux data. A series of repeating auroral hiss episodes is observed to initiate near the magnetic field line that traverses a Saturn kilometric Radiation Source region in each hemisphere, with periodic episodes of hiss recurring at higher L‐shells. Magnetic field lines centered on individual hiss episodes have auroral footprints that lie near and within a region of intense auroral ultraviolet emissions. These observations have a parallel in terrestrial return current electron beam‐generated auroral hiss seen near magnetic field lines supporting auroral kilometric Radiation Source regions. Recent findings link periodic plasma injections with Saturn reconnection sites observed preferentially on the duskside. These injections may spawn Saturn kilometric Radiation Source regions and periodic auroral hiss emission in nearby return current regions.Peer reviewe
V. L. Kantsyrev - One of the best experts on this subject based on the ideXlab platform.
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double planar wire array as a compact plasma Radiation Source
Physics of Plasmas, 2008Co-Authors: V. L. Kantsyrev, L I Rudakov, A. S. Chuvatin, A. S. Safronova, A. A. Esaulov, C A Coverdale, C Deeney, K M Williamson, M F Yilmaz, I ShresthaAbstract:Magnetically compressed plasmas initiated by a double planar wire array (DPWA) are efficient Radiation Sources. The two rows in a DPWA implode independently and then merge together at stagnation producing soft x-ray yields and powers of up to 11.5kJ∕cm and more than 0.4TW∕cm, higher than other planar arrays or low wire-number cylindrical arrays on the 1MA Zebra generator. DPWA, where precursors form in two stages, produce a shaped Radiation pulse and radiate more energy in the main burst than estimates of implosion kinetic energy. High Radiation efficiency, compact size (as small as 3–5mm wide), and pulse shaping show that the DPWA is a potential candidate for ICF and Radiation physics research.
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Planar wire array as powerful Radiation Source
IEEE Transactions on Plasma Science, 2006Co-Authors: V. L. Kantsyrev, Kenneth Williamson, L I Rudakov, A. S. Chuvatin, Dmity A. Fedin, A. S. Safronova, A. A. Esaulov, A. L. Velikovich, Vladimir V Ivanov, Nicolas D. OuartAbstract:The radiative performance of Al, Ni, and W planar wire arrays, to which little energy could be coupled via the conventional magnetic-to-kinetic conversion mechanism, is investigated. However, the planar wire arrays were shown to radiate much more energy in a short intense peak than possible due to dissipation of the kinetic energy. The planar array gives the unique possibility of seeing the evolution of the small-scale inhomogeneity of wire-array plasmas during wire ablation and implosion phases and highlights the importance of the Hall plasma phenomena and their impact on the dynamics, energy coupling, and Radiation performance of wire-array Z-pinches
M. E. Sasin - One of the best experts on this subject based on the ideXlab platform.
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prepulse induced shock waves in the gas jet target of a laser plasma euv Radiation Source
Journal of Physics D, 2017Co-Authors: A. V. Garbaruk, S. G. Kalmykov, M S Gritskevich, A M Mozharov, M. E. SasinAbstract:In experiments with a laser-plasma EUV-Radiation Source, the main IR Nd:YAG laser pulse was preceded by that of a UV KrF excimer laser. Dramatic modulations of EUV plasma emissivity have been observed at long interpulse times, from hundreds of nanoseconds up to microseconds. To discover the nature of these prepulse-produced long-living perturbations of the target, a fluid dynamics numerical simulation of the Xe gas jet has been carried out. The prepulse has been found to generate a quasi-spherical shock wave with a thin dense front layer and a vast rarefied inside area. In the course of time, the front expands and simultaneously drifts downstream along with the gas. Depending on the interpulse time, the IR laser beam either intersects the dense layer or propagates within the rarefied gas cavity whereby the above-mentioned variations in the plasma emission can be explained. The possibilities of making use of the discovered phenomena to enhance the observed EUV plasma brightness are discussed.
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Computational optimization analysis of a gas-jet target in a laser-plasma short-wave Radiation Source
Technical Physics, 2011Co-Authors: A. V. Garbaruk, D. A. Demidov, S. G. Kalmykov, M. E. SasinAbstract:A computational method is developed for optimizing the xenon gas jet used as the target in a laserplasma short-wave Radiation Source. The method is based on numerical hydrodynamic simulation of the jet flowing from the nozzle into vacuum, followed by computation of the optimization criterion describing the observed intensity of plasma glow. The application of this method permits an unambiguous and objective choice of optical experimental geometries and flow conditions; as a result, the Radiation yield can be increased by several times. The calculated results are compared with available experimental data.
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numerical simulation of gas jet target in the laser produced plasma short wave Radiation Source
Technical Physics Letters, 2010Co-Authors: A. V. Garbaruk, D. A. Demidov, S. G. Kalmykov, M. E. SasinAbstract:Numerical simulation of Xe gas jet, outflowing from a nozzle into the vacuum and considered as a target in the LPP Radiation Source, has been carried out. Different nozzle configurations and different gas conditions before the nozzle have been considered. A criterion based on the simulation results and describing observable plasma Radiation intensity has been proposed. The criterion makes it possible to select an optimum configuration for a further experimentation. Results of the calculation are compared with earlier published experimental data.
A S Portnyagin - One of the best experts on this subject based on the ideXlab platform.
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sps technique for ionizing Radiation Source fabrication based on dense cesium containing core
Journal of Hazardous Materials, 2019Co-Authors: E K Papynov, O O Shichalin, Yu V Mayorov, V G Kuryavyi, T A Kaidalova, L V Teplukhina, A S PortnyaginAbstract:Abstract The work presents a novel method for fabrication of the high-quality ionizing Radiation Source (IRS), which is promising to replace unsafe commercial products based on 137CsCl prohibited by IAEA. Spark plasma sintering (SPS) technique has been applied to produce dense ceramic and glass-ceramic matrixes from Cs-containing (˜13.5 wt.%) zeolite yielding in non-dispersible cores sealed in the container of Radiation-resistant steel (J93503, US standard). One-stage SPS regimes to provide high-quality product have been optimized: sintering temperature
I Shrestha - One of the best experts on this subject based on the ideXlab platform.
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double planar wire array as a compact plasma Radiation Source
Physics of Plasmas, 2008Co-Authors: V. L. Kantsyrev, L I Rudakov, A. S. Chuvatin, A. S. Safronova, A. A. Esaulov, C A Coverdale, C Deeney, K M Williamson, M F Yilmaz, I ShresthaAbstract:Magnetically compressed plasmas initiated by a double planar wire array (DPWA) are efficient Radiation Sources. The two rows in a DPWA implode independently and then merge together at stagnation producing soft x-ray yields and powers of up to 11.5kJ∕cm and more than 0.4TW∕cm, higher than other planar arrays or low wire-number cylindrical arrays on the 1MA Zebra generator. DPWA, where precursors form in two stages, produce a shaped Radiation pulse and radiate more energy in the main burst than estimates of implosion kinetic energy. High Radiation efficiency, compact size (as small as 3–5mm wide), and pulse shaping show that the DPWA is a potential candidate for ICF and Radiation physics research.
