Oieroset_ARTEMIS_tail_science
... a) When and where does Kelvin-Helmholtz instabilities develop on the flanks? Two-spacecraft measurements can be used to identify non-linear KH vortices which have been suggested to provide significant solar wind entry into the tail during northward IMF conditions. ...
... a) When and where does Kelvin-Helmholtz instabilities develop on the flanks? Two-spacecraft measurements can be used to identify non-linear KH vortices which have been suggested to provide significant solar wind entry into the tail during northward IMF conditions. ...
Fusion: A true challenge for an enormous reward
... Fusion of heavier nuclei in stars will occur at higher temperatures. From the formula above, it is immediately clear that a contraction of the star under its own gravity will further raise the central temperature. Fusion in heavy stars will continue to keep the star alive as long as the reactions ar ...
... Fusion of heavier nuclei in stars will occur at higher temperatures. From the formula above, it is immediately clear that a contraction of the star under its own gravity will further raise the central temperature. Fusion in heavy stars will continue to keep the star alive as long as the reactions ar ...
Effect of parallel velocity shear on the electrostatic ion
... was recorded. The radial positioning of the collector is accomplished by rotating the support shaft across the plasma cross section. A plot of the EIC oscillation amplitude, excited at a frequency f ⫽39 kHz versus the rotation angle is shown in Fig. 3. The center of the plasma column corresponds t ...
... was recorded. The radial positioning of the collector is accomplished by rotating the support shaft across the plasma cross section. A plot of the EIC oscillation amplitude, excited at a frequency f ⫽39 kHz versus the rotation angle is shown in Fig. 3. The center of the plasma column corresponds t ...
fusion concepts
... handling and ultimate disposal of the activated materials. 5. No generation of weapons material. Another significant advantage is that the materials and by-products of fusion are not suitable for use in the production of nuclear weapons. ...
... handling and ultimate disposal of the activated materials. 5. No generation of weapons material. Another significant advantage is that the materials and by-products of fusion are not suitable for use in the production of nuclear weapons. ...
On neoclassical impurity transport in stellarator geometry
... The trajectory in real space followed by a particle given by eq. (5) is referred to as global since the radial magnetic and E × B drifts across the flux surface, vd · ∇s and vE ·∇s respectively, are accounted for. In contrast, the guiding center trajectory without these drifts in lowest order is cal ...
... The trajectory in real space followed by a particle given by eq. (5) is referred to as global since the radial magnetic and E × B drifts across the flux surface, vd · ∇s and vE ·∇s respectively, are accounted for. In contrast, the guiding center trajectory without these drifts in lowest order is cal ...
Experimental Study of the Hot Electron
... obtain the radial temperature profile, one has to first unfold the spectra for each energy channel, which results in spectra vs. radius, and then determine the temperature vs. radius from each of the inverted spectra. Because of the limited number of data points and the uncertainties in the target d ...
... obtain the radial temperature profile, one has to first unfold the spectra for each energy channel, which results in spectra vs. radius, and then determine the temperature vs. radius from each of the inverted spectra. Because of the limited number of data points and the uncertainties in the target d ...
HT-7上逃逸电子行为的研究进展
... make these interesting measurements, then since you have LHCD on HT-7, you might also consider measuring the runaway probability function by varying the rf phase velocity. To my knowledge, such a direct measurement has not yet been done, though much of the physics has been inferred from current (mag ...
... make these interesting measurements, then since you have LHCD on HT-7, you might also consider measuring the runaway probability function by varying the rf phase velocity. To my knowledge, such a direct measurement has not yet been done, though much of the physics has been inferred from current (mag ...
Bernstein-Greene-Kruskal Modes in a Three
... Greene, and Kruskal in a classic paper [1], represent exact nonlinear plasma waves that do not experience any Landau damping in a one-dimensional (1D) unmagnetized plasma. If such a solution is stable, it can survive a long time in a weakly collisional plasma. In the small-amplitude limit, BGK solut ...
... Greene, and Kruskal in a classic paper [1], represent exact nonlinear plasma waves that do not experience any Landau damping in a one-dimensional (1D) unmagnetized plasma. If such a solution is stable, it can survive a long time in a weakly collisional plasma. In the small-amplitude limit, BGK solut ...
Presentation (PowerPoint File)
... • Intense electron beam generates Buneman instability – nonlinear evolution into “electron holes” • localized regions of depleted electron density • Seen in satellite observations in the magnetosphere ...
... • Intense electron beam generates Buneman instability – nonlinear evolution into “electron holes” • localized regions of depleted electron density • Seen in satellite observations in the magnetosphere ...
The Stellarator Concept - Nuclear Sciences and Applications
... as Pi, for example, a line of force will pass. This line of force may now be followed, in the direction of the magnetic field, along the stellarator tube, until it has completed one circuit of the toroidal tube and intersects the cross-sectional plane at a point P2, as shown in Fig. 1. In the ideal ...
... as Pi, for example, a line of force will pass. This line of force may now be followed, in the direction of the magnetic field, along the stellarator tube, until it has completed one circuit of the toroidal tube and intersects the cross-sectional plane at a point P2, as shown in Fig. 1. In the ideal ...
Word - Contemporary Physics Education Project
... Figure T-6: An atom that might be ionized by the forces on a negative electron and a positive nucleus due to the electric field between two oppositely charged objects. In those situations in which an electron is loosely bound to an atom or a molecule, it might be possible for a very strong electrica ...
... Figure T-6: An atom that might be ionized by the forces on a negative electron and a positive nucleus due to the electric field between two oppositely charged objects. In those situations in which an electron is loosely bound to an atom or a molecule, it might be possible for a very strong electrica ...
Lecture 8 Magnetopause Magnetosheath Bow shock Fore Shock
... A shock is a discontinuity separating two different regimes in a continuous media. – Shocks form when velocities exceed the signal speed in the medium. – A shock front separates the Mach cone of a supersonic jet from the undisturbed air. Characteristics of a shock : – The disturbance propagates fast ...
... A shock is a discontinuity separating two different regimes in a continuous media. – Shocks form when velocities exceed the signal speed in the medium. – A shock front separates the Mach cone of a supersonic jet from the undisturbed air. Characteristics of a shock : – The disturbance propagates fast ...
Who’s Afraid of a Stellar Superflare? Rachel Osten GSFC
... superflaring in normal stars -- Schaefer et al. (2000) normal solar-like stars undergoing flaring events with energy releases 1033-1038 ergs, occurring roughly once every 100 years or so ...
... superflaring in normal stars -- Schaefer et al. (2000) normal solar-like stars undergoing flaring events with energy releases 1033-1038 ergs, occurring roughly once every 100 years or so ...
Modeling and simulation of plasma etching reactors for
... These result from dissociation or dissociative ionization reactions where the excess electron energy is deposited as kinetic energy of the product fragments. At low pressures, these fragments do not suffer enough collisions to thermalize [9]. In plasmas of interest the velocity of electrons is much ...
... These result from dissociation or dissociative ionization reactions where the excess electron energy is deposited as kinetic energy of the product fragments. At low pressures, these fragments do not suffer enough collisions to thermalize [9]. In plasmas of interest the velocity of electrons is much ...
Project 1 Plasma flow velocity from spectroscopic
... Plasma in the fusion device EXTRAP T2R is confined partly by a magnetic field from an external magnetic field coil, and partly by an internal magnetic field produced by electric currents flowing in the plasma. This internal magnetic field has variations in time and spaced due to magneto-hydrodynamic (MHD) ...
... Plasma in the fusion device EXTRAP T2R is confined partly by a magnetic field from an external magnetic field coil, and partly by an internal magnetic field produced by electric currents flowing in the plasma. This internal magnetic field has variations in time and spaced due to magneto-hydrodynamic (MHD) ...
paper - General Atomics Fusion Group
... thermal quench is no longer in the neoclassical banana regime, that is, for the low temperature phase the collision time τe becomes less than the bounce time τb . In this case, the contribution to the plasma current from the low velocity electrons must be calculated from the neoclassical formulas [1 ...
... thermal quench is no longer in the neoclassical banana regime, that is, for the low temperature phase the collision time τe becomes less than the bounce time τb . In this case, the contribution to the plasma current from the low velocity electrons must be calculated from the neoclassical formulas [1 ...
Thermalization of magnetized electrons from black body radiation F Robicheaux and J Fajans
... We describe an interesting mechanism whereby an electron in a strong magnetic field can have both the parallel and perpendicular motions come into thermal equilibrium with black body radiation. The mechanism does not include any collisions with other particles and can overcome the extreme slowing of ...
... We describe an interesting mechanism whereby an electron in a strong magnetic field can have both the parallel and perpendicular motions come into thermal equilibrium with black body radiation. The mechanism does not include any collisions with other particles and can overcome the extreme slowing of ...
Location and spatial shape of electron beams in Io`s
... Io flyby an energetic field‐aligned electron population was measured in Io’s wake [Williams et al., 1996]. The pitch angle distribution was bidirectional. In 2001 two polar flybys took place. I31 (northern pass) and I32 (southern pass) both showed energetic electrons streaming onto Io’s polar caps [ ...
... Io flyby an energetic field‐aligned electron population was measured in Io’s wake [Williams et al., 1996]. The pitch angle distribution was bidirectional. In 2001 two polar flybys took place. I31 (northern pass) and I32 (southern pass) both showed energetic electrons streaming onto Io’s polar caps [ ...
PDF
... Although not understood, it was explained as resulting from either stimulated Raman scattering (SRS) from an abnormally low density region in the plasma, increased levels of ion mode activity, or non-uniform laser heating of the plasma. In the very homogeneous, well-characterized plasmas used in the ...
... Although not understood, it was explained as resulting from either stimulated Raman scattering (SRS) from an abnormally low density region in the plasma, increased levels of ion mode activity, or non-uniform laser heating of the plasma. In the very homogeneous, well-characterized plasmas used in the ...
The absorption of laser radiation by a laser produced plasma.
... these measurements substantiated that greater percentages of ...
... these measurements substantiated that greater percentages of ...
Generace, ztráty a diagnostika ubíhajících elektron˚uv
... This current is generated by an external electric field. The tokamak community currently looks up to the final stage of the fusion research - the ITER (International Thermonuclear Experimental Reactor) project. This large reactor is designed to finally reach the breakeven. This means that the energy ...
... This current is generated by an external electric field. The tokamak community currently looks up to the final stage of the fusion research - the ITER (International Thermonuclear Experimental Reactor) project. This large reactor is designed to finally reach the breakeven. This means that the energy ...
Dynamics of Field- Reversed-Configuration in SSX Abram Falk Swarthmor
... separating action from reaction. However, what is lost in simplicity is gained in richness. The complexity of the particle-field coupling leads to a state of matter that supports an impressive capacity for global structure. Even if plasma dynamics were not interesting, we could not ignore the plasma ...
... separating action from reaction. However, what is lost in simplicity is gained in richness. The complexity of the particle-field coupling leads to a state of matter that supports an impressive capacity for global structure. Even if plasma dynamics were not interesting, we could not ignore the plasma ...
ISWTalmadge1
... A 28 GHz gyrotron, with maximum output power of 200 kW, is used in the Helically Symmetric Experiment (HSX) to heat electrons to the low collisionality regime. The normal configuration in HSX is quasihelically symmetric (QHS) and has a dominant n = 4, m = 1 component in the magnetic field spectrum. ...
... A 28 GHz gyrotron, with maximum output power of 200 kW, is used in the Helically Symmetric Experiment (HSX) to heat electrons to the low collisionality regime. The normal configuration in HSX is quasihelically symmetric (QHS) and has a dominant n = 4, m = 1 component in the magnetic field spectrum. ...
Plasma (physics)
Plasma (from Greek πλάσμα, ""anything formed"") is one of the four fundamental states of matter, the others being solid, liquid, and gas. A plasma has properties unlike those of the other states.A plasma can be created by heating a gas or subjecting it to a strong electromagnetic field applied with a laser or microwave generator. This decreases or increases the number of electrons, creating positive or negative charged particles called ions, and is accompanied by the dissociation of molecular bonds, if present.The presence of a significant number of charge carriers makes plasma electrically conductive so that it responds strongly to electromagnetic fields. Like gas, plasma does not have a definite shape or a definite volume unless enclosed in a container. Unlike gas, under the influence of a magnetic field, it may form structures such as filaments, beams and double layers.Plasma is the most abundant form of ordinary matter in the Universe (the only matter known to exist for sure, the more abundant dark matter is hypothetical and may or may not be explained by ordinary matter), most of which is in the rarefied intergalactic regions, particularly the intracluster medium, and in stars, including the Sun. A common form of plasmas on Earth is seen in neon signs.Much of the understanding of plasmas has come from the pursuit of controlled nuclear fusion and fusion power, for which plasma physics provides the scientific basis.