Journal of Theoretical and Applied Physics (JTAP)Role of dust and ionization on gradient driven instability in a cross-field plasmaVolume 17 (2023) JTAPIssue 5, November & December 202320231117Role of dust and ionization on gradient driven instability in a cross-field plasma10.57647/j.jtap.2023.1705.46ENDimpleSharmaShri Ramdeobaba College of Engineering and Management Nagpur, Maharashtra, India.MunishMunishDepartment of Physics, Gargi College, University of Delhi, Delhi, India.RajatDhawanDepartment of Physics, MM Engineering College, Maharishi Markandeshwar, Mullana-Ambala, Haryana, India0000-0002-7673-0144RavinderKumarDepartment of Physics, Janta Vedic College Baraut, Uttar Pradesh, India.Journal Article20231117Presence of dust in cross-field plasma systems such as Hall thrusters or in plasma processing units changes the whole physical phenomenon. Owing to the density gradient, pressure gradient and spatial variation of the magnetic field, the plasma in these devices is often found to be unstable and hence, instability evolves in these systems. Considering dust contamination and ionization in the plasma, we make theoretical study on the growth rate of the instability under the effect of dust density, dust mass and dust charge in addition to the effect of ion temperature, ion temperature gradient, scale length of density inhomogeneity and profile of the ion velocity. For their effective use, the said plasma systems need to be instability free, and the model developed in the present article will help experimentalists to optimize the plasma parameters, external magnetic field and biasing voltage.Journal of Theoretical and Applied Physics (JTAP)Elastic moduli of some rare-earth doped tellurite glassesVolume 17 (2023) JTAPIssue 5, November & December 202320231117Elastic moduli of some rare-earth doped tellurite glasses10.57647/j.jtap.2023.1705.47ENRaoufEl‑MallawanyPhysics Department, Faculty of Science, Menoufia University, Menoufia, Egypt.0000-0003-2978-5326SamirA. YousefPhysics Department, Faculty of Science, Menoufia University, Menoufia, Egypt.AbdelhamidEl-ShaerPhysics Department, Faculty of Science, Kafreelshikh University, Kafreelshikh, Egypt.HananA. ElabdPhysics Department, Faculty of Science, Menoufia University, Menoufia, Egypt.Journal Article20231117Samarium oxide (Sm2O3) and ytterbium oxide (Yb2O3) doped tungsten-tellurite glasses (TWSm), (TWYb) in the forms of 80 (TeO2) - (20-x) (WO3) - x (Sm2O3) and 80 (TeO2) - (20-x) (WO3) - x (Yb2O3) with x = 0, 1.0, 2.0, 3.0, 4.0 and 5.0 mol% were prepared by the melt-quenching technique. The XRD analysis for the two prepared glass systems verified the samples’ amorphous nature. The glass density ( ρ ) was measured by the Archimedes method. Both ( ρ ) and the molar volume (VM) of the two prepared systems showed an increase with increasing the concentrations of dopants Sm3+ and Yb3+. Longitudinal VL and shear VS wave velocities were measured at 5 MHz frequency using the pulse-echo technique. Longitudinal (L), shear (G), bulk (K), and Young’s moduli ( E ) have been founded. Moreover, Poisson’s (σ), Debye temperature (θD), softening temperature (TS), micro-hardness (H) have been founded for every glass sample. Elastic moduli showed an increase with increasing dopants concentration of (Sm2O3) or (Yb2O3). Moreover, the bulk modulus of (TWSm) glasses was higher than (TWYb) glasses. Mechanical properties of (TWSm) and (TWYb) are crucial parameter in manufacturing optical fibers.Journal of Theoretical and Applied Physics (JTAP)Scattering of quantum hydromagnetic waves in a semiconductor plasmaVolume 17 (2023) JTAPIssue 5, November & December 202320231117Scattering of quantum hydromagnetic waves in a semiconductor plasma10.57647/j.jtap.2023.1705.48ENZeynabKiamehrDepartment of Marines Sciences, Basic Sciences Group, Chabahar Maritime University, Chabahar, Iran.
Department of Physics, University of Tafresh, Tafresh, Iran.ZohrehKiamehrDepartment of Mathematics, Faculty of Mathematics, University of Sistan & Baluchestan, Zahedan, Iran.Journal Article20231117In addition to the fact that waves have been proven in different plasma environments, they have also been investigated under different physical regimes. In this research, the propagation of electromagnetic waves in quantum semiconductor plasma in the presence of a uniform external magnetic field was investigated using the quantum hydro magnetism model. The researches that have been done so far about these waves have mostly been done in classical or relativistic regimes. Some cases have been studied to study linear waves in quantum plasma, taking into account the quantum Bohm potential without investigating the effect of the spin characteristics of plasma particles. In addition to the simultaneous study of spin and quantum effects of semiconductor plasma components, exchange-correlation relationships have not been found in any research, and the most important novelty of the present work can be considered the addition of these relationships together. The obtained results show that the effects of quantum and external magnetic fields have a significant effect on the scattering of hydromagnetic waves, which causes the appearance of nonlinear terms in the scattering relationship. By increasing the linear part of the electron spin in the sputtering relation, some relations have been modified, including the Alfven velocity. On the other hand, the effect of electron spin leads to the reduction of the effect of other quantum potentials on the scattering of waves. In the end, some special states of classical and quantum systems are also discussed. Considering the limit states, the results of the present work are exactly similar to the results of other researchers, and this can be a self-confirmation of the obtained results.Journal of Theoretical and Applied Physics (JTAP)Magneto-plasmonic properties of hybrid nanostructures prepared by laser ablation in different solutionsVolume 17 (2023) JTAPIssue 5, November & December 202320231117Magneto-plasmonic properties of hybrid nanostructures prepared by laser ablation in different solutions10.57647/j.jtap.2023.1705.49ENR.A. EjbarahDepartment of Petroleum & Gas Engineering, College of Engineering, University of Thi-Qar, Iraq.AhmedK. KodearyDepartment of Laser Physics, College of Science for Woman, University of Babylon, Babylon, IraqTalibAbbasPhysics Department, College of Education for Pure Sciences, University of Babylon, Babylon, Iraq.Journal Article20231117The present experimental study aims to synthesize and evaluate the magneto-plasmonic properties of metallic nanoparticles to introduce a hybrid of core-shell nanoparticle that can be used in biomedical and optical applications. For these core-shell nanoparticles, gold (Au) was used as the plasmonic material and iron (Fe) as the partner in the magnetic parts. The core-shell nanoparticles were prepared by pulsed laser ablation in liquid media using a Nd:YAG pulsed laser in deionized water, as well as an aqueous solution of PVP, and for comparison an aqueous solution of PVA. Furthermore, the plasmonic and magnetic properties of the experimentally prepared core-shell nanoparticles were studied by optical spectroscopy and the vibrating sample magnetometer method within a variable magnetic field of up to 1 T. The results revealed tunable and adjustable optical linear behavior and obvious plasmonic properties by tracking the refractive index under different physical media. The results also showed that Superparamagnetic properties of core/shell nanoparticles were achieved by changing the surrounding medium. Accordingly, the results could open up new insight into the magneto-plasmonic region for beneficial biomedical applications.Journal of Theoretical and Applied Physics (JTAP)The effect of powered needle-electrode geometry on the RF plasma jetVolume 17 (2023) JTAPIssue 5, November & December 202320231117The effect of powered needle-electrode geometry on the RF plasma jet10.57647/j.jtap.2023.1705.50ENSayyed-JalalPesteheAdvanced Plasma Laboratory, Faculty of Physics, University of Tabriz, Tabriz, Iran0000-0003-3224-4600DavoodHassanpourAdvanced Plasma Laboratory, Faculty of Physics, University of Tabriz, Tabriz, Iran0000-0003-1010-2775Journal Article20231117An atmospheric pressure plasma microjet device with a tapered ground electrode and dielectric barrier is developed. The effects of the powered electrode geometry and input power on the specifications of the launched RF plasma jets are investigated. Needle-powered electrodes with different types, shapes, lengths, and diameters, such as perforated and un-perforated hollow cylindrical tubes with different inner and outer diameters or solid with flat tip and with sharp tip steel nail rods are examined. The effects of the discharge gap size on the launched jet lengths and widths are studied. The axial and radial components of the electric field are simulated at the device output nozzle by applying radiofrequency power to the needle electrode and their possible effects on the plasma plume generation are discussed. The variations of the launched microjet lengths and widths are investigated versus the working gas (argon) flow rates in two experiments with two different fixed input powers. It has been shown that there is an optimum flow rate to obtain maximum jet length with a suitable narrow width. The effects of nozzle diameter, how to inject gas into the system, and argon flow rates on the plasma plume characteristics are discussed through the Reynolds number.Journal of Theoretical and Applied Physics (JTAP)Investigating the resonance in the palladium surface plasmon electrons for inverse – β reaction in electrolysis processVolume 17 (2023) JTAPIssue 5, November & December 202320231117Investigating the resonance in the palladium surface plasmon electrons for inverse – β reaction in electrolysis process10.57647/j.jtap.2023.1705.51ENMehdiMoosaviFaculty of Science, Payame Noor University, Tehran, Iran.HosseinZaki DizajiFaculty of Science, Imam Hossein Comprehensive University, Tehran, IranAminSeiiediFaculty of Science, Payame Noor University, Tehran, Iran.Journal Article20231117The resonance effect happens in very number of natural oscillators and very important in a lot of phenomena. In the surface of a hydride metal, the resonance effect causes the kinetic energy of electrons is increased until they can cooperate inverse-β interaction. This reaction can be done in the electrolysis of palladium and platinum in water electrolyte. In this research, a new method for calculating the rate of inverse-β interaction is introduced. This method is based on the Feynman equations that is more understandable and simpler compared to other methods. The inverse-β interaction is created by high energy electrons. Surface electrons accelerate by resonance effect which it is produced by electrolysis process. The atomic electrons of metal behave as a forced oscillator with very small damping which cause the resonance effect. We will indicate this resonance effect is satisfied by the new equations. The theoretical results have good agreement with experimental results.Journal of Theoretical and Applied Physics (JTAP)A computational study on radiation shielding performances of self-passivating tungsten alloysVolume 17 (2023) JTAPIssue 5, November & December 202320231117A computational study on radiation shielding performances of self-passivating tungsten alloys10.57647/j.jtap.2023.1705.52ENZeynapAygunVocational School of Technical Sciences, , Bitlis Eren University, Bitlis, Turkey.MuratAygunDepartment of Physics, Faculty of Science and Arts, Bitlis Eren University, Bitlis, Turkey.Journal Article20231117Tungsten with its superior features such as high melting point and relatively high thermal conductivity is significant for many high temperature applications. The materials, including tungsten, which have important mechanical properties should also be investigated by their radiation attenuating abilities. The goal of the study is to contribute to the carried out studies from a different perspective by calculating radiation-matter interaction parameters of self-passivating tungsten alloys. Radiation shielding capabilities of the alloys were determined in the range of 1 keV-100GeV by Phy-X/PSD code. XCOM, a well-known code, was also used for seeing the validity of obtained mass attenuation coefficients of the alloys. It was observed that half value layer and mean free path values of the studied alloys are lower, and mass attenuation coefficients are higher than those of previously reported alloys. The alloys with higher amounts of tungsten and yttrium have higher shielding ability, while the alloys with lighter elements titanium and silica have less. Additionally, depending on the obtained fast neutron removal cross section values, the studied self-passivating tungsten alloys can be also evaluated for neutron shielding. It can be concluded that the self-passivating alloys have good radiation protection potentials besides the significant mechanical properties.Journal of Theoretical and Applied Physics (JTAP)Analytical solution of Rayleigh-Taylor instability in a Hall thruster having double-ionized ionsVolume 17 (2023) JTAPIssue 5, November & December 202320231117Analytical solution of Rayleigh-Taylor instability in a Hall thruster having double-ionized ions10.57647/j.jtap.2023.1705.53ENDhananjayVermaPlasma Science and Technology Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, IndiaHitendraK. MalikPlasma Science and Technology Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India0000-0002-9432-8140Journal Article20231117A modified Rayleigh-Taylor (RT) instability equation is derived using a three-fluid Hall thruster plasma model by including multi-ionized ions to study the growth rate of the RT instability. For a simplified plasma density and electron drift velocity axial profile, the growth rate for an unstable wave and the condition leading to this instability are discussed. A possible analytical solution for the modified Rayleigh-Taylor equation is discussed along with the condition that leads to it. For double-ionized ions, the behavior of growth rate and perturbed potential for different densities of double-ionized ions are studied.Journal of Theoretical and Applied Physics (JTAP)Electron plasma wave excitation by two co-propagating super-Gaussian laser beams in collisional nanocluster PlasmaVolume 17 (2023) JTAPIssue 5, November & December 202320231117Electron plasma wave excitation by two co-propagating super-Gaussian laser beams in collisional nanocluster Plasma10.57647/J.JTAP.2023.1705.54ENAshishVarmaLaser Plasma and Material Research Group, Department of Physics, K. N. Govt. P. G. College, Gyanpur, Bhadohi, India.ShriPrakas MishraLaser Plasma and Material Research Group, Department of Physics, K. N. Govt. P. G. College, Gyanpur, Bhadohi, India.ArvindKumarPlasma Physics Research Group, Department of Physics, University of Allahabad, Prayagraj, India.SujeetKumarPlasma Physics Research Group, Department of Physics, University of Allahabad, Prayagraj, India.AsheelKumarPlasma Physics Research Group, Department of Physics, University of Allahabad, Prayagraj, India.Journal Article20231117In this theoretical study, we investigate the electron plasma wave excitation (EPW) by two copropagating high power laser beams in collisional nanocluster plasma. The interaction of electric field profile of laser beams causes the ionization of nanocluster and very quickly it converts into the plasma plume balls. The electric field profile of each super-Gaussian laser beam imparts the oscillatory velocity to the electron associated with nanoclustered plasma. The copropagating laser beams generate the nonlinear ponderomotive force to electrons at beat wave frequency ω=ω1-ω2 and wave number k=k1-k2 . This nonlinear ponderomotive force drives the self-consisted space charge field and it might have much potential to excite the electron plasma wave in nanoclustered plasma. The expression of electron plasma wave electrostatic potential is derived in nanoplasma medium with considering the electron-ion collision effect. The effective surface plasmons resonance at the surface of nanoclustered plasma plays a crucial role for excitation process. The electron plasma wave excitation is tuned and controlled by varying the super-Gaussian index, cluster radius, density, laser beat wave frequency, laser beam width and collisional frequency. The electron plasma wave excitation might be applicable in nonlinear phenomena such as self-focusing and anomalous absorption.Journal of Theoretical and Applied Physics (JTAP)Chromium ions effects on Sb2O3-PbO-GeO2 glass properties for radiation protectionVolume 17 (2023) JTAPIssue 5, November & December 202320231117Chromium ions effects on Sb2O3-PbO-GeO2 glass properties for radiation protection10.57647/J.JTAP.2023.1705.55ENMohammedIbrahim SayyedDepartment of Physics, Faculty of Science, Isra University, Amman, Jordan
Department of Nuclear Medicine Research, Institute for Research and Medical Consultations, Imam Abdulrahman Bin Faisal, Saudi ArabiaKawaM. KakyAl-Nisour University College, Baghdad, Iraq0000-0002-6338-5943RanaA. AnaeeDepartment of Materials Engineering, University of Technology, Baghdad, IraqJournal Article20231117In this work we studied the radiation shielding features of Li2O-Sb2O3-PbO-GeO2-Cr2O3 glass systems at different energies ranging from 0.284 to 1.33 MeV. The maximum linear attenuation coefficient (LAC) for the germinate glasses is in the order of 0.680-0.707 cm-1 and this is reported at 0.284 MeV, whereas the minimum LAC is observed at 1.33 MeV and varied between 0.159-0.166 cm-1. An increase in the LAC is found for these glasses due to the addition of Cr2O3, and the glasses coded as C5 (with 0.5 mol% of Cr2O3) has the highest LAC. The half value layer (HVL) of the selected glasses with different contents of Cr2O3 is investigated, and the results demonstrated that the HVL is small at low energies and ranging from 0.98-1.02 cm at 0.284 MeV and from 1.328-1.383 cm at 0.347 MeV. The maximum HVL is observed at 1.33 MeV and equal to 4.175 cm for C5 and 4.352 cm for C1. The tenth value layer (TVL) values for the present glasses were reported, and the results showed that as the density increases from 3.07 to 3.2 g/cm3, the TVL decreases from 3.388 to 3.256 cm at 0.284 MeV, and from 13.413 to 12.868 cm at 1.173 MeV.