Possible new astrophysics-relevant experiments with high
... dissipative vortices and, therefore, by the Reynolds number. It is practically impossible to create conditions where the Reynolds number in the laboratory experiment would be the same as in its astrophysical counterpart. A question then arises: Will two systems with very large but different Reynolds ...
... dissipative vortices and, therefore, by the Reynolds number. It is practically impossible to create conditions where the Reynolds number in the laboratory experiment would be the same as in its astrophysical counterpart. A question then arises: Will two systems with very large but different Reynolds ...
Comparison Between Sawteeth Oscillations in Bean and Oval
... disruptive events observed in plasmas. In particular, it is believed to play a role in the magnetic storms that periodically beset communication satellites, as well as in the sawtooth oscillations that limit the performance of fusion experiments. There is growing evidence, however, that pressure-dri ...
... disruptive events observed in plasmas. In particular, it is believed to play a role in the magnetic storms that periodically beset communication satellites, as well as in the sawtooth oscillations that limit the performance of fusion experiments. There is growing evidence, however, that pressure-dri ...
Numerical simulation of the Helicon Double Layer Thruster
... system. The global model is used to simulate the plasma source behavior, it provides the source ionization rate, plasma density and electron temperature to the other two codes. A 1-D code named PPDL was developed specifically for this purpose. It is a hybrid code with Boltzmann electrons and drift-k ...
... system. The global model is used to simulate the plasma source behavior, it provides the source ionization rate, plasma density and electron temperature to the other two codes. A 1-D code named PPDL was developed specifically for this purpose. It is a hybrid code with Boltzmann electrons and drift-k ...
Plasma Physics Definitions
... – Elastic collisions deplete very little of the electron’s energy and do not significantly influence the molecules because of the great mass difference between electrons and molecules: Mass of electron = 9.11 e-31 kg, Mass of Argon = 6.64e20 kg. – Inelastic collisions excite the molecules of gas or ...
... – Elastic collisions deplete very little of the electron’s energy and do not significantly influence the molecules because of the great mass difference between electrons and molecules: Mass of electron = 9.11 e-31 kg, Mass of Argon = 6.64e20 kg. – Inelastic collisions excite the molecules of gas or ...
ARTEMIS writeup
... and eventually becomes accelerated to relativistic energies in the radiation belt region. One possible conclusion of this result is that energization due to non-adiabatic processes (e.g., acceleration near reconnection regions or wave-particle interactions) may be occurring as electrons make their w ...
... and eventually becomes accelerated to relativistic energies in the radiation belt region. One possible conclusion of this result is that energization due to non-adiabatic processes (e.g., acceleration near reconnection regions or wave-particle interactions) may be occurring as electrons make their w ...
Kinetic Studies of Nonrelativistic Young Supernova Remnant
... In the unmagnetized case, small-scale electrostatic and filamentation-like instabilities operate in parallel and heat the electrons. Eventually, strong fluctuations arise in the density of electrons and ions that lead to the formation of the double-shock structure. Thus, electron dynamics play an im ...
... In the unmagnetized case, small-scale electrostatic and filamentation-like instabilities operate in parallel and heat the electrons. Eventually, strong fluctuations arise in the density of electrons and ions that lead to the formation of the double-shock structure. Thus, electron dynamics play an im ...
The impact of black holes on the Universe
... – Plasma can flow along but not across field lines. – A section of a line with less plasma is less weighed down, so B-pressure causes it to arch up, speeding flow of plasma from this section (Parker instability) – Soon there are loops of field connecting foot points in the disc that are in relative ...
... – Plasma can flow along but not across field lines. – A section of a line with less plasma is less weighed down, so B-pressure causes it to arch up, speeding flow of plasma from this section (Parker instability) – Soon there are loops of field connecting foot points in the disc that are in relative ...
Slide 1
... neutral beam systems • magnetically confined fusion plasmas are heated by neutral beam injection (150 keV D+) • cannot accelerate neutral atoms • accelerate H+ then neutralize by charge exchange inefficient at >100 keV • however, with H-, the neutralization efficiency remains high out to 500 keV. ...
... neutral beam systems • magnetically confined fusion plasmas are heated by neutral beam injection (150 keV D+) • cannot accelerate neutral atoms • accelerate H+ then neutralize by charge exchange inefficient at >100 keV • however, with H-, the neutralization efficiency remains high out to 500 keV. ...
Determining the radial distribution of the emission coefficient from a
... QP450-2-XSR: 455µm Fiber, extreme solarizationresistant, 2 m length for High-resolution Spectrometer HR4000 UV/VIS and QP400-2-VIS : 400µm Premium Fiber, VIS/NIR, 2 m length for High-resolution Spectrometer HR4000 NIR. Fig. 3 shows the principle scheme of the HR 4000 Spectrometer. ...
... QP450-2-XSR: 455µm Fiber, extreme solarizationresistant, 2 m length for High-resolution Spectrometer HR4000 UV/VIS and QP400-2-VIS : 400µm Premium Fiber, VIS/NIR, 2 m length for High-resolution Spectrometer HR4000 NIR. Fig. 3 shows the principle scheme of the HR 4000 Spectrometer. ...
How pulsars work - SLAC
... charge-separated (Holloway 73). Pair production, acceleration and gamma-ray emission result. Outer gaps disappear for large pair outflow. ...
... charge-separated (Holloway 73). Pair production, acceleration and gamma-ray emission result. Outer gaps disappear for large pair outflow. ...
Plasma Seminar 4/23/07 "Negative Ion Plasmas"
... neutral beam systems • magnetically confined fusion plasmas are heated by neutral beam injection (150 keV D+) • cannot accelerate neutral atoms • accelerate H+ then neutralize by charge exchange inefficient at >100 keV • however, with H-, the neutralization efficiency remains high out to 500 keV. ...
... neutral beam systems • magnetically confined fusion plasmas are heated by neutral beam injection (150 keV D+) • cannot accelerate neutral atoms • accelerate H+ then neutralize by charge exchange inefficient at >100 keV • however, with H-, the neutralization efficiency remains high out to 500 keV. ...
volume 86 part 3 - Australian ITER Forum
... Figure 1 (a) This shows different plasmas in terms of their temperature in K, and the number density (no. of charged particles/m3). The range of temperatures spans more than six orders of magnitude, while the number density spans more than 30 orders of magnitude.
... Figure 1 (a) This shows different plasmas in terms of their temperature in K, and the number density (no. of charged particles/m3). The range of temperatures spans more than six orders of magnitude, while the number density spans more than 30 orders of magnitude.
Magnetic Confinement of the Plasma Fusion by Tokamak Machine
... The hot and dense plasma to the breast of which takes place reactions of fusion must be isolated of the surrounding wall that containing it in order to avoid foulness that can cool it. Therefore figure 5 present the method employee to trap particles of plasma thanks to an adapted magnetic profile. K ...
... The hot and dense plasma to the breast of which takes place reactions of fusion must be isolated of the surrounding wall that containing it in order to avoid foulness that can cool it. Therefore figure 5 present the method employee to trap particles of plasma thanks to an adapted magnetic profile. K ...
Static structure factor of electrons around a heavy positively charged
... for very small r. For r nearly equal to r s, R is nearly equal to one for temperatures greater than 60K implying thereby that no quantum corrections are needed for r > r~. Further, the quantum corrections as one would expect become increasingly important for r < r, but the degree of their contributi ...
... for very small r. For r nearly equal to r s, R is nearly equal to one for temperatures greater than 60K implying thereby that no quantum corrections are needed for r > r~. Further, the quantum corrections as one would expect become increasingly important for r < r, but the degree of their contributi ...
Plasma physics, space research and the origin of the solar system
... plasma physics has started along two parallel lines. The first one was the hundred years old investigations in what was called electrical discharges in gases. This approach was to a high degree experimental and phenomenological, and only very slowly reached some degree of theoretical sophistication. ...
... plasma physics has started along two parallel lines. The first one was the hundred years old investigations in what was called electrical discharges in gases. This approach was to a high degree experimental and phenomenological, and only very slowly reached some degree of theoretical sophistication. ...
Summary
... ions, because some of the electrons are captured by the grains, and are therefore immobilized by the high dust masses. The charge of the dust grain depends on the local plasma conditions (temperature and plasma density), which will vary with the waves coming by and therefore the dust grain charge ha ...
... ions, because some of the electrons are captured by the grains, and are therefore immobilized by the high dust masses. The charge of the dust grain depends on the local plasma conditions (temperature and plasma density), which will vary with the waves coming by and therefore the dust grain charge ha ...
(SV) “Ionosat”: Orbital cluster
... Maximal disturbances of neutral particles nn ~ 107 cm-3 concentration and temperature nn ~ 105 cm-3, Tn ~ 103 К Maximal disturbances of ion and electron ni ~ 105 cm-3 concentration and temperature ni ~ 104 cm-3, Te ~ Ti ~ Tn ~103 K Level of non-isothermicity Te / Ti = 1-4 ...
... Maximal disturbances of neutral particles nn ~ 107 cm-3 concentration and temperature nn ~ 105 cm-3, Tn ~ 103 К Maximal disturbances of ion and electron ni ~ 105 cm-3 concentration and temperature ni ~ 104 cm-3, Te ~ Ti ~ Tn ~103 K Level of non-isothermicity Te / Ti = 1-4 ...
SPACE CHARGE & Jets
... What is producing the space charge? As Alfven pointed out, if trapped ion and electron pitchangle distributions are different, then parallel electric fields (aka space charge) is needed to achieve time-averaged neutrality (from a particle viewpoint). Whipple 77 calculates the potential resulting fro ...
... What is producing the space charge? As Alfven pointed out, if trapped ion and electron pitchangle distributions are different, then parallel electric fields (aka space charge) is needed to achieve time-averaged neutrality (from a particle viewpoint). Whipple 77 calculates the potential resulting fro ...
Synergistic effect of sterilization by microwave-excited atmospheric-pressure plasma jet using photo-catalyst TiO2 with H2O2 and distilled water
... Sterilization has been one of common research topics in biomedical applications [1]. Many researchers employed H2O2 based on conventional UV method with photo catalyst such as TiO2 to enhance bactericidal effect [2]. Low temperature plasma has been proposed as a noble sterilizer which is more effect ...
... Sterilization has been one of common research topics in biomedical applications [1]. Many researchers employed H2O2 based on conventional UV method with photo catalyst such as TiO2 to enhance bactericidal effect [2]. Low temperature plasma has been proposed as a noble sterilizer which is more effect ...
Influence of thin film on the electrical properties of pulsed plasmas
... studied by the analysis of the floating voltage on the electrodes. In the plasmas that contain highly reactive gas such as acetylene, a thin film of hydrocarbons deposits on electrodes and walls of the reactors. The dust particles produced by acetylene polymerization can also be included in the thin ...
... studied by the analysis of the floating voltage on the electrodes. In the plasmas that contain highly reactive gas such as acetylene, a thin film of hydrocarbons deposits on electrodes and walls of the reactors. The dust particles produced by acetylene polymerization can also be included in the thin ...
Plasma Sources and Feedback Control in Pretreatment Web
... bond with the coating to be applied. It is therefore common that the substrate material needs some type of pre-treatment in order to remove contaminates and to functionalize the web surface. Hollow cathode, linear microwave, ion and magnetron sputtering sources are some of the pre-treatment sources ...
... bond with the coating to be applied. It is therefore common that the substrate material needs some type of pre-treatment in order to remove contaminates and to functionalize the web surface. Hollow cathode, linear microwave, ion and magnetron sputtering sources are some of the pre-treatment sources ...
Supersonic turbulence?
... • Problem: specific energy ~ u2 in macroscopic motions, length scale l gets converted to heat (cascading eddies, radiative shocks) in time ~ l/u. • Need u ~ virial speed and l << R for support. • But this means dissipation time l/u << crossing time R/u, so need constant replenishment (winds??) • Ord ...
... • Problem: specific energy ~ u2 in macroscopic motions, length scale l gets converted to heat (cascading eddies, radiative shocks) in time ~ l/u. • Need u ~ virial speed and l << R for support. • But this means dissipation time l/u << crossing time R/u, so need constant replenishment (winds??) • Ord ...
Plasma-assisted combustion for gas turbine application
... Development of modern combustion system designs pushed the requirements on operability, durability, fuel efficiency and also on pollutant emissions. Often these requirements are contradictory. In particular low NOx emissions can be achieved by making the fuel-air mixture very lean but as the equival ...
... Development of modern combustion system designs pushed the requirements on operability, durability, fuel efficiency and also on pollutant emissions. Often these requirements are contradictory. In particular low NOx emissions can be achieved by making the fuel-air mixture very lean but as the equival ...
Collisionless interaction of an energetic laser produced plasma C. Constantin
... and intensities (∼5 × 1010 W/cm2 ) discovered that shear Alfvén waves are radiated from the laser-plasma. These experiments also studied the evolution of the laser plasma expansion in magnetized environments and the consequent formation of a diamagnetic cavity (VanZeeland and Gekelman 2004). Recentl ...
... and intensities (∼5 × 1010 W/cm2 ) discovered that shear Alfvén waves are radiated from the laser-plasma. These experiments also studied the evolution of the laser plasma expansion in magnetized environments and the consequent formation of a diamagnetic cavity (VanZeeland and Gekelman 2004). Recentl ...
New Theory of Nuclear Fusion Processes in Sun and other
... fusion reactor powered by its hot core having extremely high pressures and temperatures (~ 15MK). Even though this theory accounts for energy generation of the sun and elements formation by fusion processes from a hot plasma of Hydrogen and Helium, the theory fails to explain many of the observed ph ...
... fusion reactor powered by its hot core having extremely high pressures and temperatures (~ 15MK). Even though this theory accounts for energy generation of the sun and elements formation by fusion processes from a hot plasma of Hydrogen and Helium, the theory fails to explain many of the observed ph ...