The dispersion of linear waves in a uniform cold quantum plasma is derived using the hydrodynamic equations with magnetic field Wigner-Poisson system. Langmuir wave becomes whistler-like due to effects and, therefore, can propagate plasma. It also found that do not affect left-handed, right-handed, and ordinary waves.

To reveal the dynamic mechanical characteristics of deep rocks, a series impact tests under triaxial static stress states corresponding to depths 300–2400 m were conducted. The results showed that both strain rates and environments in depth significantly affect rocks. sensitivity rate strength deformation modulus shows negative correlation with depth, indicating producing penetrative cracks is more difficult when damage occurs. tendency decrease then increase slightly, but decreases sharply...

The Jeans instability in dense quantum plasmas is investigated the presence of two dimensional magnetic fields and resistive effects. effects are shown to introduce whether perturbation stable or not ideal magnetohydrodynamic model. analytical expressions growth rate obtained for both finite remarkable cases. results relevant astrophysical objects, e.g., neutron stars interior white dwarfs, as well low-temperature laboratory plasmas.

The effects of the quantum mechanism and magnetic field on Rayleigh–Taylor (RT) instability in an ideal incompressible plasma are investigated. explicit expression linear growth rate is obtained presence fixed boundary conditions. It shown that has a stabilizing effect RT similar to behavior classical plasmas affected significantly by effects. Quantum also suppress with appropriate physical quantities. Some astrophysical parameters discussed as example investigate new

Abstract In a differential rotating system, we use the incompressible multifluid model to investigate dynamics of weakly ionized plasma placed in vertical background magnetic field with radial shearing. The equilibrium current is taken into account. differences velocities between charged species and neutrals are supposed be related collisions. analytical expression general local dispersion relation derived effect shearing demonstrated three different limiting cases. Momentum transfer...

Abstract We analytically investigate geodesic acoustic modes (GAMs) in tokamak plasmas with up-down asymmetric and non-circular cross-sections using magnetohydrodynamics (MHD) a Miller-like flux surface model. Explicit expressions for GAM frequency, magnetic field perturbations, Lagrangian displacement are presented. Our results reveal that (I) asymmetry (σ) slightly increases the frequency introduces additional sin or cos components (opposite to dominant component) perturbations; (II)...

Abstract Electromagnetic geodesic acoustic modes (GAMs) are analytically investigated in tokamak plasmas with anisotropy, utilizing gyro-kinetic equations and a rigorously self-consistent anisotropic distribution. When including first-order finite-orbit-width effects finite-Larmor-radius effects, it is proven that the anisotropy an arbitrary strength does not induce m=±1 harmonics of A ∥ , where m denote poloidal wavenumber parallel component perturbed magnetic vector potential,...

Electrostatic drift waves (EDWs) are investigated in nonuniform quantum magnetized dusty plasmas by taking into account dust gravitational effects with the help of hydrodynamic model. Ions and electrons viewed as low-temperature Fermi gases, whereas neglected for grains. The analytical dispersion relationship EDWs is derived. Quantum shown to affect EDW significantly. Jeans terms induce a driftlike instability, which does not exist absence effects. criteria growth rate kind instability...

The effects of shear flow and transverse magnetic field on Richtmyer–Meshkov instability are examined the expression interface perturbation is obtained by analytically solving linear ideal magnetohydrodynamics equations. It shows that evolves exponentially rather than linearly in presence when va<1−AT2δu∕2, where va modified Alfvén velocity, AT Atwood number, δu relative respectively. acts as a destabilizing source, while stabilizing mechanism shocked corrugated problem. whole...

The Jeans instability in dense quantum plasmas is investigated by taking into account the Hall term and resistivity presence of two-dimensional magnetic fields. general dispersion relation presented. introduces a new wave mode which does not exist ideal magnetohydrodynamic framework. Two limiting cases with respect to effect are discussed. shown induce frequency shift but change criterion. exhibits damping or destabilizing effects on plasma system under different circumstances. analytical...

Abstract Plasma elongation effects on energetic particle-induced geodesic acoustic modes (EGAMs) are theoretically investigated by using gyro-kinetic equations and the Miller local equilibrium model. Including an arbitrary κ a finite radial derivative <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mi>s</mml:mi> <mml:mi>κ</mml:mi> </mml:msub> <mml:mo>=</mml:mo> <mml:mi>r</mml:mi> <mml:mi mathvariant="normal">∂</mml:mi> <mml:mrow> <mml:mo>/</mml:mo>...

Based on the one component plasma model, a new dispersion relation and group velocity of elliptically polarized extraordinary electromagnetic waves in superdense quantum magnetoplasma are derived. The wave is modified due to forces magnetization effects within certain range numbers. It means that spin-1/2 can reduce transport energy such systems. Our work should be relevance for dense astrophysical environments condensed matter physics.

Abstract Plasma boundary detection and reconstruction are important not only for plasma operation but also facing materials. Traditional methods, example, EFIT code, which is constrained by electromagnetic measurement, very challenging detecting the in long-pulse burning devices such as ITER. A novel algorithm of using one visible camera has been developed on experimental advanced superconducting tokamak (EAST) fusion reactors. U-Net convolutional neural network was used to identify pixel...

In a strongly magnetized plasma, where the particles' thermal gyro-radii are smaller than Debye length, magnetic field greatly affects plasma's relaxation processes. The expressions for time rates of change electron and ion parallel perpendicular temperatures obtained calculated analytically small anisotropies through considering binary collisions between charged particles in presence uniform by using perturbation theory. Based on these expressions, effects anisotropic due to...

Electromagnetic drift waves in a nonuniform quantum magnetized electron–positron–ion (EPI) plasma are studied. By using the hydrodynamic equations with magnetic fields of Wigner–Maxwell system, we obtained new dispersion relation which ions' motions not considered. The positrons component (featured by parameter ξ), density gradient electrons, and shown to have significant impact on relation. Our results should be relevant dense astrophysical objects, e.g. white dwarf pulsar magnetospheres,...

Theoretical research on the geodesic acoustic mode (GAM) induced by equilibrium toroidal rotation flow in tokamak plasmas is approached using ideal magnetohydrodynamic model. The dispersion relation of GAM presented taking into account magnetic field perturbations. It shown that β can decrease frequency GAM.

Electrostatic drift waves (EDWs) in nonuniform quantum magnetized plasmas are described by the hydrodynamic model. Electrons viewed as a low-temperature Fermi gas. Analytical expression of dispersion relationship EDW is presented. Quantum effects shown to affect significantly. The on relation due magnetic field and spatial inhomogeneity give rise results similar classical case. Our should be relevant dense astrophysical objects, e.g., neutron stars, magnet-stars, white dwarfs.

Geodesic acoustic mode (GAM) is analyzed by using modified gyro-kinetic (MGK) equation applicable to low-frequency microinstabilities in a rotating axisymmetric plasma. Dispersion relation of GAM the presence arbitrary toroidal Mach number analytically derived. The effects rotation on frequency and damping rate do not depend orientation equilibrium flow. It shown that M increases dramatically decreases Landau rate.

Zonal flows (ZFs) in a tokamak plasma with anisotropic pressure are investigated. The dynamics of perpendicular and parallel pressures determined by the Chew-Goldberger-Low double equations low-β condition is adopted, where β ratio to magnetic field pressure. dispersion relation analytically derived illustrates two branches ZFs. low frequency zonal flow (LFZF) branch becomes unstable when χ, one, greater than threshold value χc, which about 3.8. In stable region, its increases first then...

Lagrangian displacement and magnetic field perturbation response to the geodesic acoustic mode is analyzed by using ideal magnetohydrodynamic equations in a large-aspect-ratio tokamak. δBθ, poloidal component of perturbation, has wave number m = 2 created ξθ. The parallel field, δB∥, poloidally asymmetric structure with 1 on same order magnitude δBθ leading order. radial ξr O(βϵξθ) but plays significant role determining where β plasma/magnetic pressure ratio ϵ inverse aspect ratio.

The linear stability of a differential rotating magnetized plasma is analyzed in the collisionless approximation along with heat flux vector. dispersion relation derived and simplified cases are discussed instability criteria presented. Anisotropic pressures shown to not only alter classical criterion but also induce new unstable regions. shear collisional scalar kinetic pressure presence self-gravitational effect then considered. Three specifically according general relation. effects Jeans...

The magnetorotational instability (MRI) is investigated using a two-fluid model. Electrons and singly charged ions are supposed to have the same angular velocity eliminate equilibrium current. linear dispersion relation governing local MRI derived. criteria in non-magnetized weakly magnetized cases differ remarkably from those predicted by one-fluid Based on general case, we present critical conditions for occurrence of instability. Gyroeffects significantly alter criterion introduce four...

A magnetic field greatly affects the relaxation phenomena in a plasma when particles’ thermal gyro-radii are smaller than Debye length. Its influence on temperature (TR) is investigated through consideration of binary collisions between charged particles presence uniform within perturbation theory. The times calculated. It shown that electron-electron (e-e) and ion-ion (i-i) TR rates first increase then decrease as grows, doubly logarithmic term contained electron-ion (e-i) rate results from...