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Showing 1 to 20 of 65 for “"Collisionless"”.
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Interplanetary collisionless shock waves.
Thesis (Sc D.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1970.
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Linear and non-linear collisionless many-particle systems
… on linear and non-linear stability results for collisionless many-particle systems described by distribution functions satisfying classical kinetic models arising in astrophysics. On the one hand, we study the large time behavior of solutions to the Vlasov--Poisson system, which describes a …
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Collisionless ion collection by a sphere in a weakly magnetized plasma
… designed code SCEPTIC have fully addressed the collisionless and unmagnetized problem for a drifting collector idealized as a sphere. SCEPTIC is a 2d/3v hybrid Particle In Cell (PIC) code, in which the ion motion is fully resolved, while the electrons are treated as a Boltzmann distributed fluid …
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Collisionless ion collection by non-emitting spherical bodies in E x B fields
… three-dimensional interaction of a magnetized, collisionless flowing plasma with a non-emitting conducting sphere is solved in the entire range of physically allowed parameters, in the ion-collecting regime. This can be considered as the "spherical Mach probe" problem, establishing how the ion …
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Laboratory Astrophysics Studies of Magnetized Collisionless Shock Precursors and the ³He³He Proton Spectrum at the OMEGA Laser Facility
… experiments. For the macrophysics contribution, collisionless shocks experiments were conducted at the OMEGA laser facility using the new gas jet platform. Collisionless shocks are shock waves formed through plasma processes when particle collisions are negligible. These shocks can form as bow …
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Particle-In-cell simulations of nonlocal and nonlinear effects in inductively coupled plasmas
… rates, these are shown to include the local collisionless regime, the anomalous skin effect regime, and the nonlinear regime.The local collisionless regime occurs at high driving frequencies and is characterized by plasma behaviour independent of both the driving frequency and amplitude: a …
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The Effects of Weak Collisions on Nonlinear Plasma Kinetics
… is treated typically within the framework of the collisionless Vlasov equation. It has become clear in recent theoretical and experimental work that weak collisions are a singular perturbation on the collisionless theory, and qualitatively alter the results of the collisionless theory. In …
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The Influence of Dark and Ordinary Matter Physics on Galaxy Formation
… The current, widely assumed paradigm of a collisionless, cold DM (CDM) and dark energy cosmology called $\Lambda$CDM has proven to be very successful on large scales. Yet, observed galaxies are generally less dense than simple CDM-only predictions, and while CDM is often assumed to be a …
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Bondi-Hoyle-Lyttleton Accretion of Cold and Self-Interacting Dark Matter
… expectations for both cases where the medium is collisionless and collisional are examined to obtain a sense of the properties of the BHL wake that forms in each case, including the size of the Hoyle-Lyttleton radius and magnitude of the accretion rate. N-body simulations of the BHL accretion …
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Numerical simulations of x-ray clusters
… to model both the hot gas as well as the dark, collisionless component that observations imply. This code employs a higher-order accurate fluid-dynamics method for improved resolution and its accuracy is tested by a suite of tests.
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Electron equations of state during magnetic reconnection
… local electron dynamics. Particularly in collisionless plasmas, velocity-space anisotropy of the electrons plays a leading role in governing the energy exchanges and shaping the currents that develop during reconnection. The anisotropy results from an electric field parallel to the …
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Infrared Photon Initiated Conformer Interconversion, Fourier Transform Microwave Spectroscopy of Hydrogen Bonded Trimers, and Study of Conformer Cooling in Supersonic Expansions
… For the first time, well defined energy in collisionless conditions was deposited in a ground electronic state molecule with subsequent intramolecular energy flow perturbing the equilibria between conformers (methyl vinyl ether).
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Weakly collisional electrostatic simulations for laboratory astrophysics applications
… relevant phenomena. Of particular interest are collisionless shocks, and the physics of the weakly collisional regime generally. While ubiquitous in nature, collisionless shocks remain relatively poorly understood. Recent and ongoing experiments are proving increasingly successful at isolating …
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Struktur und Dynamik wechselwirkender Galaxien
… To test this hypothesis, simulations of collisionless mergers between disk galaxies with different mass ratios and orbital geometries were performed. Every merger remnant was investigated with respect to its photometric and kinematic properties. The methods used to determine the …
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Experimental investigation of nonlinear interactions of drift waves
Collisionless cesium and potassium plasmas are investigated in a single-ended Q-machine. A wave associated with the circular plasma-limiting aperture is observed when the plate temperature is high enough. This wave and the ordinary drift wave interact nonlinearly to produce new waves at the sum and …
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Extended general relativistic magnetohydrodynamics: Formulation and application to black hole accretion
… larger than the inflow time. Thus, the plasma is collisionless and is subject to a wide range of kinetic phenomena that are absent from current general relativistic ideal magnetohydrodynamic models. We exploit the gyro ordering of a collisionless magnetized plasma, and use Israel-Stewart formalism …
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Electric fields and transport in optimized stellarators
… types of stellarator have perfectly confined collisionless particle orbits as well as one additional feature. Quasisymmetric plasmas have minimal flow damping, which may lead to reduced turbulent transport. Quasi-isodynamic plasmas can have vanishing bootstrap current, implying less variation …
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A Study of Magnetic Reconnection: From 2D Energy Release to 3D Spreading and Localization
… it fast enough to explain energy release rates? Collisionless (Hall) reconnection leads to energy release rates fast enough to explain observations. Large-scale resistive Hall-Magnetohydrodynamics simulations of the transition from Sweet-Parker to Hall reconnection are presented; the first to …
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Photodissociation Dynamics In Titan's Atmosphere
… and heptane isomers) are carried out under collisionless condition using the DC slice imaging technique. In diacetylene photodissociation, two-photon processes dominate at 243 nm and 212 nm whereas at 121.6 nm, a one-photon dissociation process dominates. Direct measurement of the lifetime …
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