Thermal conduction effects on the kink instability in coronal loops
... (in SI units) is τκ L20 ne kB 1011 /T 05/2 , where T 0 is the loop plasma temperature. For T 0 = 1 MK this gives τκ 80 s. Thus for such coronal loops the MHD timescale is of the order of seconds while that for thermal conduction is of the order of minutes. It is estimates of these timescales tha ...
... (in SI units) is τκ L20 ne kB 1011 /T 05/2 , where T 0 is the loop plasma temperature. For T 0 = 1 MK this gives τκ 80 s. Thus for such coronal loops the MHD timescale is of the order of seconds while that for thermal conduction is of the order of minutes. It is estimates of these timescales tha ...
Physics of Magnetically Confined Plasmas
... Three considerations set a minimal level for the magnetic field strength, which is a few Tesla. (1) The magnetic field pressure must be significantly larger than the plasma pressure to provide a stable force balance, Section (V). (2) A charged particle moves in a circle about magnetic field lines, a ...
... Three considerations set a minimal level for the magnetic field strength, which is a few Tesla. (1) The magnetic field pressure must be significantly larger than the plasma pressure to provide a stable force balance, Section (V). (2) A charged particle moves in a circle about magnetic field lines, a ...
Radio Emission from the Sun and Stars
... sense of the o-mode. The reason for o-mode polarization is that the ratio of emissivity to absorption coefficient is larger for the o-mode than for the x mode, and electrons of slightly higher average energy produce o-mode emission in optically thick sources. For plasma radiation the polarization i ...
... sense of the o-mode. The reason for o-mode polarization is that the ratio of emissivity to absorption coefficient is larger for the o-mode than for the x mode, and electrons of slightly higher average energy produce o-mode emission in optically thick sources. For plasma radiation the polarization i ...
"Magnetic Field Extraction of Trap-based Electron Beams Using a High Permeability Grid" Phys. Plasmas 22 , 073503 (2015) N. C. Hurst, J. R. Danielson, and C. M. Surko New (PDF)
... a small, approximately constant tine spacing as a function of distance from the symmetry axis, which acts to minimize the deleterious momentum impulses. Under reasonably optimal, but practical conditions, the perpendicular impulse magnitudes can potentially be reduced by approximately an order of ma ...
... a small, approximately constant tine spacing as a function of distance from the symmetry axis, which acts to minimize the deleterious momentum impulses. Under reasonably optimal, but practical conditions, the perpendicular impulse magnitudes can potentially be reduced by approximately an order of ma ...
Tokyo Ball Lightning Paper
... never did it, at an earlier morphology, impinge upon the highly conducting inner surface of the sheath. Finally, with the azimuthal field dissipated, the cylindrical portions of the stroke collapse and extinguish, leaving a spheroidal magnetoplasmoid suspended in air continuing to exist off its cons ...
... never did it, at an earlier morphology, impinge upon the highly conducting inner surface of the sheath. Finally, with the azimuthal field dissipated, the cylindrical portions of the stroke collapse and extinguish, leaving a spheroidal magnetoplasmoid suspended in air continuing to exist off its cons ...
Ultrahigh magnetic fields produced in a gas .. puff Z pinch
... our megagauss facility was < 3 min, and could have easily been reduced, if desired. Even the repetition period of much larger gas-puff Z pinch devices, such as PROTO II at Sandia National Laboratories or PITHON at Physics International, with an order-of-magnitude higher field-producing capability, i ...
... our megagauss facility was < 3 min, and could have easily been reduced, if desired. Even the repetition period of much larger gas-puff Z pinch devices, such as PROTO II at Sandia National Laboratories or PITHON at Physics International, with an order-of-magnitude higher field-producing capability, i ...
Cassini observations of a Kelvin‐Helmholtz vortex
... boundary crossings. Data taken by MAG, ELS, and LEMMS are shown, revealing the properties of the local magnetic field and electrons over the combined ELS‐LEMMS energy range. The periodic modulation seen in the ELS energy‐time spectrogram (Figure 3e; particularly evident during the first 2.5 h of the ...
... boundary crossings. Data taken by MAG, ELS, and LEMMS are shown, revealing the properties of the local magnetic field and electrons over the combined ELS‐LEMMS energy range. The periodic modulation seen in the ELS energy‐time spectrogram (Figure 3e; particularly evident during the first 2.5 h of the ...
Explicit time-reversible orbit integration in magnetic field
... Unfortunately the Boris scheme requires a fine resolution of the Larmor angular frequency Ω = Q|B|/m, typically Ω∆t < ∼ 0.3 for a 1% accuracy [1], which is penalizing if Ω is much larger than any other characteristic frequency of the problem. In the regime of static uniform magnetic field considered ...
... Unfortunately the Boris scheme requires a fine resolution of the Larmor angular frequency Ω = Q|B|/m, typically Ω∆t < ∼ 0.3 for a 1% accuracy [1], which is penalizing if Ω is much larger than any other characteristic frequency of the problem. In the regime of static uniform magnetic field considered ...
Cross-sectional area and intensity variations of sausage modes⋆
... the flux tube and B0,e outside the flux tube. The plasma pressure and density are p0,i and ρ0,i inside the flux tube and p0,e and ρ0,e outside the flux tube. We assume that the plasma has no background flow, i.e. the equilibrium velocity is v0 = 0 both inside and outside the flux tube. The ideal MHD ...
... the flux tube and B0,e outside the flux tube. The plasma pressure and density are p0,i and ρ0,i inside the flux tube and p0,e and ρ0,e outside the flux tube. We assume that the plasma has no background flow, i.e. the equilibrium velocity is v0 = 0 both inside and outside the flux tube. The ideal MHD ...
2004 - SUNIST
... lengths well above 1000 s. For active control of discharges we have refined our diagnostic systems (particularly in the plasma edge region), improved the physics understanding (particularly of particle transport) and developed suitable actuators. In the presence of high-Z plasma facing components th ...
... lengths well above 1000 s. For active control of discharges we have refined our diagnostic systems (particularly in the plasma edge region), improved the physics understanding (particularly of particle transport) and developed suitable actuators. In the presence of high-Z plasma facing components th ...
Show publication content!
... The influence of construction of bifilar winding on efficiency of electrostatic precipitator 11. Marcin Buczaj Supporting of power sources of decision-making devices and security system elements in building by photovoltaic cells 12. Paweł Mazurek The interaction of the plasma reactor system with pow ...
... The influence of construction of bifilar winding on efficiency of electrostatic precipitator 11. Marcin Buczaj Supporting of power sources of decision-making devices and security system elements in building by photovoltaic cells 12. Paweł Mazurek The interaction of the plasma reactor system with pow ...
Electron temperature variation associated with the auroral energy input
... high vacuum (<10−7 torr) for more than 24 hours to get outgas from the probe surface, and subsequently tipped off the vacuum system (Oyama and Hirao, 1976). In this way, uncontaminated probe was glass-sealed. The glass was broken by a spring-actuated sharp edge during the rocket flight and removed b ...
... high vacuum (<10−7 torr) for more than 24 hours to get outgas from the probe surface, and subsequently tipped off the vacuum system (Oyama and Hirao, 1976). In this way, uncontaminated probe was glass-sealed. The glass was broken by a spring-actuated sharp edge during the rocket flight and removed b ...
Influence of Hydrogen Atoms on the Growth of carbon based
... selective etching or surface treatment. The reactor consists of two parallel electrodes. The RF power is coupled to one of them while another is grounded. Usually the substrate is mounted on the powered electrode to achieve harder coatings. The applied RF power produces a plasma between electrodes, ...
... selective etching or surface treatment. The reactor consists of two parallel electrodes. The RF power is coupled to one of them while another is grounded. Usually the substrate is mounted on the powered electrode to achieve harder coatings. The applied RF power produces a plasma between electrodes, ...
enA imaging: seeing the invisible
... A thin carbon foil is located at the end of the collimators. The remaining ENAs pass through this foil with only a small energy loss, producing a shower of secondary electrons that is accelerated with electrostatic fields to the “start micro-channel plate” (MCP; see Fig. 6). These electrons form a s ...
... A thin carbon foil is located at the end of the collimators. The remaining ENAs pass through this foil with only a small energy loss, producing a shower of secondary electrons that is accelerated with electrostatic fields to the “start micro-channel plate” (MCP; see Fig. 6). These electrons form a s ...
the cassini radio and plasma wave investigation
... Although various radio emission mechanisms have been identified in planetary magnetospheres, one mechanism stands out above all others in terms of radiated power: the cyclotron maser mechanism (Wu and Lee, 1979). Cyclotron maser radiation is produced by a coherent electromagnetic plasma instability ...
... Although various radio emission mechanisms have been identified in planetary magnetospheres, one mechanism stands out above all others in terms of radiated power: the cyclotron maser mechanism (Wu and Lee, 1979). Cyclotron maser radiation is produced by a coherent electromagnetic plasma instability ...
The Solar Wind Interaction with the Earth`s
... line is curved and the particle moves parallel to the field line, it will drift perpendicular to the magnetic field as shown on the right. If the magnetic field strength varies with distance, such as the inverse cube falloff in a dipole field, the gyrating particle will drift perpendicular to the gr ...
... line is curved and the particle moves parallel to the field line, it will drift perpendicular to the magnetic field as shown on the right. If the magnetic field strength varies with distance, such as the inverse cube falloff in a dipole field, the gyrating particle will drift perpendicular to the gr ...
plasma-focus
... The sub-barrier nature of fusion does not require heating of hydrogen isotopes – deuterium or a deuterium-tritium mixture – to a temperature of 280 keV, which corresponds to about 3⋅109 K (we will specify the temperature in electron-volts and it should be noted that 1 eV corresponds to 11,600 K). Th ...
... The sub-barrier nature of fusion does not require heating of hydrogen isotopes – deuterium or a deuterium-tritium mixture – to a temperature of 280 keV, which corresponds to about 3⋅109 K (we will specify the temperature in electron-volts and it should be noted that 1 eV corresponds to 11,600 K). Th ...
Remediation of Radiation Belts Using
... of the lower plasmaspheric plasma, however, this rule-ofthumb breaks down, and in fact the sheath size of the electrostatic tether can be many times the Debye length of the plasma. The size and structure of the plasma sheath depend primarily upon the tether’s bias voltage V, the radius of the tether ...
... of the lower plasmaspheric plasma, however, this rule-ofthumb breaks down, and in fact the sheath size of the electrostatic tether can be many times the Debye length of the plasma. The size and structure of the plasma sheath depend primarily upon the tether’s bias voltage V, the radius of the tether ...
longitudinal plasma oscillations in an electric field
... The ion distribution function, F, satisfies the same conclude that either the quasi-linear approximation equation with elm + -e/M. The external electrical with time-independent f,,is inherently inconsistent or field E,(t) is a given function of time, while the self- else that it demands a special fo ...
... The ion distribution function, F, satisfies the same conclude that either the quasi-linear approximation equation with elm + -e/M. The external electrical with time-independent f,,is inherently inconsistent or field E,(t) is a given function of time, while the self- else that it demands a special fo ...
T F G P
... cluster. The cluster can, in turn, dissolve back into the two-dimensional adatom gas or form a stable nucleus. The latter occurs if the cluster size is larger than a critical value, i∗ , commonly represented in number of atoms. For low growth temperatures i∗ is often equal to one [21, pp. 567-579], ...
... cluster. The cluster can, in turn, dissolve back into the two-dimensional adatom gas or form a stable nucleus. The latter occurs if the cluster size is larger than a critical value, i∗ , commonly represented in number of atoms. For low growth temperatures i∗ is often equal to one [21, pp. 567-579], ...
MODELING PLASMA EQUIPMENT AND FEATURE PROFILE IN
... obtain the angular and energy distribution (AED) of the incident fluxes to the substrate. The magnitude and AED of the incident fluxes from HPEM are then used as input data in the Monte Carlo Feature Profile Model (MCFPM) to self-consistently simulate trench filling. The predicted profiles agree wit ...
... obtain the angular and energy distribution (AED) of the incident fluxes to the substrate. The magnitude and AED of the incident fluxes from HPEM are then used as input data in the Monte Carlo Feature Profile Model (MCFPM) to self-consistently simulate trench filling. The predicted profiles agree wit ...
Driving Saturn`s magnetospheric periodicities from the upper
... rotational phase on the proposed rotating convective flow pattern following magnetospheric disruptions that occur at times of extreme solar wind conditions (but see Southwood [2011b]). Various observations over many years indicate that persistent discontinuities of phase in the periodic signals do n ...
... rotational phase on the proposed rotating convective flow pattern following magnetospheric disruptions that occur at times of extreme solar wind conditions (but see Southwood [2011b]). Various observations over many years indicate that persistent discontinuities of phase in the periodic signals do n ...
The effect of chirped intense femtosecond laser pulses on the Argon
... Developments of ultra-short intense laser pulses through CPA and OPCPA techniqueshave attracted increasing attention in the main subject of laser-matter interaction [1]. These pulses are used for the generation of quasi mono-energetic electron beams up to mega-electron volts [2-6]. The ponderomotiv ...
... Developments of ultra-short intense laser pulses through CPA and OPCPA techniqueshave attracted increasing attention in the main subject of laser-matter interaction [1]. These pulses are used for the generation of quasi mono-energetic electron beams up to mega-electron volts [2-6]. The ponderomotiv ...
numerical experiments on fine structure within
... 2.2. The Modified SHASTA Code and the Efficiency Test The SHASTA code is well suited for studying shock waves since it can sustain a sharp shock transition over only two or three mesh points, and shock transitions in the code are free from spurious oscillations caused by Gibb’s phenomenon. The origi ...
... 2.2. The Modified SHASTA Code and the Efficiency Test The SHASTA code is well suited for studying shock waves since it can sustain a sharp shock transition over only two or three mesh points, and shock transitions in the code are free from spurious oscillations caused by Gibb’s phenomenon. The origi ...
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.