Article
Physics, Applied
Sanjay Chandra Andola, Ashutosh Chandrajeet Jaiswar, Trilok Chand Kaushik, Keshaw Datt Joshi
Summary: This report presents a comparative study on the properties of x-rays from X-pinches made of two groups of metallic wires. The study found that the Cu group requires a higher current to compress the plasma compared to the W group X-pinches. Additionally, a significant improvement in x-ray quality was observed in wires with a few micron thick dielectric coating. These findings are important for the development of a small capacitive X-pinch system suitable for high-energy density physics research.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Astronomy & Astrophysics
Yanli Qiu, Hua Feng
Summary: The study suggests that the soft emission component in ultraluminous X-ray sources (ULXs) can be explained as originating from the photosphere of an optically thick wind, with pulsating ULXs (PULXs) showing lower blackbody luminosity; however, the blackbody luminosity for PULXs exceeds the Eddington limit for neutron stars, possibly due to optically thick wind originating from the inner accretion flow. The mass accretion rate in standard ULXs is lower on average than in luminous and very soft X-ray sources, indicating different accretion mechanisms.
ASTROPHYSICAL JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Alexandros Skoulakis, Evaggelos Kaselouris, Antonis Kavroulakis, Christos Karvounis, Ioannis Fitilis, John Chatzakis, Vasilis Dimitriou, Nektarios A. Papadogiannis, Michael Tatarakis
Summary: An X-pinch scheme of a low-current generator is characterized as a potential efficient source of soft X-rays, with the X-pinch target consisting of wires made from tungsten or gold-plated tungsten loaded at different angles. Time-resolved measurements showed different X-ray yields for different wire angles. The X-pinch was also found to be ideal for X-ray radiography applications.
APPLIED SCIENCES-BASEL
(2021)
Article
Physics, Multidisciplinary
C. Stollberg, E. Kroupp, D. Mikitchuk, P. Sharma, M. Cvejic, V. Bernshtam, R. Doron, E. Stambulchik, Y. Maron, A. Fruchtman, I. E. Ochs, N. J. Fisch, U. Shumlak
Summary: Spectroscopic measurements reveal a sudden current redistribution from the stagnating plasma to a low-density plasma at larger radii in a Z-pinch, while the stagnating plasma continues to implode. It is shown that the current is transferred to an increasing-conductance low-density plasma outside the stagnation, possibly due to the large impedance of the stagnating plasma. This fast current redistribution may have a significant impact on the behavior and achievable parameters in systems with imploding plasmas and pulsed-power systems.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Milenko Vescovi, Felipe Veloso, Julio Valenzuela, Mario Favre
Summary: This paper presents a characterization of Cu X-pinches experiments driven at current rates around 1kA/ns. Two bursts of X-rays associated with hot-spot formation and electron beam-target mechanism are identified. The first burst is consistently correlated with the central hot-spot, while the second burst is associated with the electron beam-target mechanism.
RESULTS IN PHYSICS
(2021)
Article
Physics, Multidisciplinary
G. Krieger, L. Martinelli, S. Zeng, L. E. Chow, K. Kummer, R. Arpaia, M. Moretti Sala, N. B. Brookes, A. Ariando, N. Viart, M. Salluzzo, G. Ghiringhelli, D. Preziosi
Summary: The electronic and magnetic excitations and charge density correlations in Nd1-xSrxNiO2 thin films were studied, with and without a SrTiO3 capping layer. Dispersing magnons were observed only in the capped samples, progressively dampened with higher doping. An elastic resonant scattering peak similar to the charge order signal in hole-doped cuprates was detected in the uncapped x=0 compound, which weakens with doping and disappears in the superconducting x=0.20 film.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Eric A. Zizzi, Marco Cavaglia, Jack A. Tuszynski, Marco A. Deriu
Summary: The effects of volatile anesthetics on lipid bilayers include a decrease in lipid order and bilayer thickness, an increase in overall lipid lateral mobility and area-per-lipid, and a marked reduction in the mechanical stiffness of the membrane.
Article
Chemistry, Physical
Nathan J. Szymanski, Christopher J. Bartel, Yan Zeng, Mouhamad Diallo, Haegyeom Kim, Gerbrand Ceder
Summary: Machine learning is a valuable tool in materials characterization, allowing for automated interpretation of experimental results and on-the-fly decision making to improve measurement effectiveness. By combining an ML algorithm with a physical diffractometer, we developed an autonomous and adaptive XRD method that leverages early experimental information to enhance the identification of crystalline phases. Our results demonstrate the effectiveness of ML-driven XRD in detecting trace materials and identifying short-lived intermediate phases, showcasing the advantages of in-line ML for materials characterization and indicating the potential for adaptive experimentation.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Andrius Pakalniskis, Denis O. Alikin, Anton P. Turygin, Alexander L. Zhaludkevich, Maxim V. Silibin, Dmitry V. Zhaludkevich, Gediminas Niaura, Aleksej Zarkov, Ramunas Skaudzius, Dmitry V. Karpinsky, Aivaras Kareiva
Summary: The structural state and crystal structure of Lu(1-x)ScxFeO3 compounds were investigated, and it was found that chemical doping with Sc ions led to a structural phase transition and the stabilization of a non-perovskite phase.
Article
Physics, Multidisciplinary
J. Strucka, J. W. D. Halliday, T. Gheorghiu, H. Horton, B. Krawczyk, P. Moloney, S. Parker, G. Rowland, N. Schwartz, S. Stanislaus, S. Theocharous, C. Wilson, Z. Zhao, T. A. Shelkovenko, S. A. Pikuz, S. N. Bland
Summary: This study describes the design and x-ray emission properties of the portable X-pinch driver Dry Pinch I developed at Imperial College London. The device reliably produces 1.1 ± 0.3 ns long x-ray bursts with photon energies ranging from 1 to 10 keV. It is suitable for use as an external driver for x-ray diagnostics in high-energy-density physics experiments.
MATTER AND RADIATION AT EXTREMES
(2022)
Article
Astronomy & Astrophysics
Matthew J. Middleton, Nick Higginbottom, Christian Knigge, Norman Khan, Grzegorz Wiktorowicz
Summary: The study investigates the impact of radiatively driven outflows in ULXs on the atmosphere of the outer disc, potentially causing unstable heating and significant mass loss. For systems with certain physically relevant parameters, this mass loss may shut off the inflow entirely and lead to limit-cycle behavior.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Shaymaa Hussein, Florent Robinet, Martin Boutelier, Diego Gotz, Aleksandra Gros, Benjamin Schneider
Summary: This paper presents the methods and performance of the Microchannel X-ray Telescope (MXT) on the Space-based multiband astronomical Variable (SVOM). By utilizing cross-correlation techniques, the algorithm is able to achieve a localization accuracy down to 2' with fewer than 200 photons, ensuring rapid follow-up for most observed gamma-ray bursts by SVOM.
ASTROPHYSICAL JOURNAL
(2023)
Article
Chemistry, Analytical
A. Scordo, V De Leo, C. Curceanu, M. Miliucci, F. Sirghi
Summary: This paper reports the reflection efficiency measurements of the VOXES Von Hamos spectrometer based on HAPG mosaic crystals and ray tracing simulation results. The results indicate the potential application value of the VH spectrometer in the field of Bragg spectrometers.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2021)
Article
Materials Science, Multidisciplinary
Tereza Kosutova, Lukas Horak, Pavel Pleskunov, Jan Hanus, Daniil Nikitin, Peter Kus, Miroslav Cieslar, Ivan Gordeev, Sanja Burazer, Andrei Choukourov, Milan Dopita
Summary: Highly porous structures consisting of niobium nanoparticles (Nb NPs) were prepared using magnetron sputtering and inert gas aggregation method. The morphology of these nanoparticles evolves thermally, with the structure transitioning from amorphous to crystalline with the increase in temperature. Annealing above 600 degrees C causes the coalescence of nanoparticles into large structures.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Physics, Fluids & Plasmas
M. P. Valdivia, G. W. Collins, F. Conti, F. N. Beg
Summary: Talbot-Lau x-ray deflectometry (TXD) is used for refraction-based imaging in high-energy-density physics experiments, particularly for diagnosing plasmas related to inertial confinement and magnetic liner inertial fusion. The optimal X-pinch configuration for TXD is found to be the laser-cut X-pinch, which offers high reproducibility, small source size, and short duration.
PLASMA PHYSICS AND CONTROLLED FUSION
(2022)
