tpc-2007-06-02-lepeltier
... 2. how to have high mobility ions? the criterion is to have for ions a drift velocity as high as 1200 cm/s (instead of ~400) since we don’t want probably have a drift field greater than 250-300V/cm this leads to an ion mobility > 4-5 cm2/(V.s). the 1rst point on the gas is that when an ion is create ...
... 2. how to have high mobility ions? the criterion is to have for ions a drift velocity as high as 1200 cm/s (instead of ~400) since we don’t want probably have a drift field greater than 250-300V/cm this leads to an ion mobility > 4-5 cm2/(V.s). the 1rst point on the gas is that when an ion is create ...
Visible Continuum Measurements on the C PFC/RR-87-2
... Density profiles during high density, clean (Zff z2 1.2), pellet fueled discharges, are also determined and are used to study the changes in particle transport after injection. For discharges with sufficiently large pellet density increases (one/ie> .7 - .9), density profiles are found to become mor ...
... Density profiles during high density, clean (Zff z2 1.2), pellet fueled discharges, are also determined and are used to study the changes in particle transport after injection. For discharges with sufficiently large pellet density increases (one/ie> .7 - .9), density profiles are found to become mor ...
ABSTRACT Trinity: A Unified Treatment of Turbulence, Transport, and Heating in Magnetized Plasmas
... To faithfully simulate ITER and other modern fusion devices, one must resolve electron and ion fluctuation scales in a five-dimensional phase space and time. Simultaneously, one must account for the interaction of this turbulence with the slow evolution of the large-scale plasma profiles. Because of ...
... To faithfully simulate ITER and other modern fusion devices, one must resolve electron and ion fluctuation scales in a five-dimensional phase space and time. Simultaneously, one must account for the interaction of this turbulence with the slow evolution of the large-scale plasma profiles. Because of ...
Experimental and Theoretical Studies of Picosecond
... the conventional thermal model based on heat conduction equation, aT —..v. ...
... the conventional thermal model based on heat conduction equation, aT —..v. ...
Reconstruction of negative hydrogen ion beam properties from
... extracted and accelerated by means of a multiple aperture grid system consisting of several hundred apertures. The typical aperture radius is in the order of several millimeters. This means the beam consists of up to several hundred small ion beams called beamlets. The division into many beamlets is ...
... extracted and accelerated by means of a multiple aperture grid system consisting of several hundred apertures. The typical aperture radius is in the order of several millimeters. This means the beam consists of up to several hundred small ion beams called beamlets. The division into many beamlets is ...
(pdf)
... the situation at Dione as indicated by Voyager and consider the effect of energetic nitrogen on the surface of Dione, in the context of energetic oxygen dominating the surface chemistry. The surface radiolysis is shown to be dominated by the magnetospheric electron population. 1.1. Titan’s Neutral T ...
... the situation at Dione as indicated by Voyager and consider the effect of energetic nitrogen on the surface of Dione, in the context of energetic oxygen dominating the surface chemistry. The surface radiolysis is shown to be dominated by the magnetospheric electron population. 1.1. Titan’s Neutral T ...
Visible-light tomography of tokamak plasmas
... of four in emissivity at the edge of plasma over varying poloidal angles are observed. The asymmetrie peaks usually occur in the same places, but when the plasma is moved or the toroidal magnetic field is reversed the positions may change drastically. No convincing agreement has been found between t ...
... of four in emissivity at the edge of plasma over varying poloidal angles are observed. The asymmetrie peaks usually occur in the same places, but when the plasma is moved or the toroidal magnetic field is reversed the positions may change drastically. No convincing agreement has been found between t ...
Physics of laser-driven plasma
... issues relevant to LPAs, in which charged particles are accelerated by plasma waves excited by short-pulse, high-intensity lasers. The remainder of the Introduction discusses a few of the basic features of plasma accelerators and the basic principles and limitations of laserdriven acceleration in va ...
... issues relevant to LPAs, in which charged particles are accelerated by plasma waves excited by short-pulse, high-intensity lasers. The remainder of the Introduction discusses a few of the basic features of plasma accelerators and the basic principles and limitations of laserdriven acceleration in va ...
Studies of ion solitary waves using simulations including hydrogen
... 1a-1d). Initially, all species are Maxwellians, but the distributions begin to show sizeable fluctuations at about the same time that solitary structures first appear in the potential. These fluctuations tend to be in phase spatially between species, with the major peaks and troughs of the phase spa ...
... 1a-1d). Initially, all species are Maxwellians, but the distributions begin to show sizeable fluctuations at about the same time that solitary structures first appear in the potential. These fluctuations tend to be in phase spatially between species, with the major peaks and troughs of the phase spa ...
The nature of Petschek-type reconnection T. G. Forbes
... where Rme = L e V Ae /η, V Ae is the Alfvén speed in the inflow region, and η is the magnetic diffusivity of the plasma. In astrophysical plasmas Rme is typically 106 to 1012 , so Sweet-Parker-type reconnection is very slow (M Ae ≈ 10−3 to 10−6 ) compared to the rates needed to explain the rapid re ...
... where Rme = L e V Ae /η, V Ae is the Alfvén speed in the inflow region, and η is the magnetic diffusivity of the plasma. In astrophysical plasmas Rme is typically 106 to 1012 , so Sweet-Parker-type reconnection is very slow (M Ae ≈ 10−3 to 10−6 ) compared to the rates needed to explain the rapid re ...
High-latitude electrojets, auroral luminosity and auroral
... the highest intensity in the auroral region, becoming less intense poleward and at subauroral latitudes. The irregular character of geomagnetic field disturbances was mentioned by Birkeland [1908], who proposed their classification. At high latitudes the positive and negative perturbations were iden ...
... the highest intensity in the auroral region, becoming less intense poleward and at subauroral latitudes. The irregular character of geomagnetic field disturbances was mentioned by Birkeland [1908], who proposed their classification. At high latitudes the positive and negative perturbations were iden ...
Plasma Process 8 she..
... (nes Φ(l) − nis Φ(l)) ≥ 0 nes ≤ nis − remember that Φ(l) < 0! This means that the electron density must be less than the ion density but not by much. This is not surprising as we have already said that the sheath occurs because the electrons would otherwise leave faster than the ions. This makes it ...
... (nes Φ(l) − nis Φ(l)) ≥ 0 nes ≤ nis − remember that Φ(l) < 0! This means that the electron density must be less than the ion density but not by much. This is not surprising as we have already said that the sheath occurs because the electrons would otherwise leave faster than the ions. This makes it ...
Generation of Convection in the Magnetosphere-Ionosphere
... the laws of MHD, creating a large-scale current system in the magnetosphere ionosphere system. The various changes in the magnetic field observed on ground or in the magnetosphere are manifestations of this current system (See Chapter 4). The penetrated plasma is not uniformly distributed in the mag ...
... the laws of MHD, creating a large-scale current system in the magnetosphere ionosphere system. The various changes in the magnetic field observed on ground or in the magnetosphere are manifestations of this current system (See Chapter 4). The penetrated plasma is not uniformly distributed in the mag ...
Modeling of Intense Laser Driven High Energy Density Plasmas
... Illuminating matter with petawatt (one quadrillion watts) laser light creates extreme states of plasmas with temperatures exceeding ten million degrees Celsius and pressures exceeding one billion earth atmospheres. These high energy density conditions are driven at the microscopic scale by dense cur ...
... Illuminating matter with petawatt (one quadrillion watts) laser light creates extreme states of plasmas with temperatures exceeding ten million degrees Celsius and pressures exceeding one billion earth atmospheres. These high energy density conditions are driven at the microscopic scale by dense cur ...
Simulation of a two-dimensional sheath over a flat insulator
... The main parameter varied in the simulation was the insulator thickness d, which affected the ratio C d /C s . The dielectric constant of the insulator ⑀ r was set at 3.8. Plasma parameters were fixed as shown in Table I. Recall that the origin of the coordinate system is at the insulator–conductor ...
... The main parameter varied in the simulation was the insulator thickness d, which affected the ratio C d /C s . The dielectric constant of the insulator ⑀ r was set at 3.8. Plasma parameters were fixed as shown in Table I. Recall that the origin of the coordinate system is at the insulator–conductor ...
CHAPTER 4 THE THUNDERCLOUD
... polarized electric field on the aircraft, which causes corona discharges and electric break down of air, will supply all the charge necessary for the lightning bolt. For example, although the net charge on the aircraft is small, the amount of ionic charge produced in the surrounding air by corona is ...
... polarized electric field on the aircraft, which causes corona discharges and electric break down of air, will supply all the charge necessary for the lightning bolt. For example, although the net charge on the aircraft is small, the amount of ionic charge produced in the surrounding air by corona is ...
Annual Report 2013 - MPG.PuRe - Max-Planck
... from the separatrix, an increasing fraction of it is carried by intermittent events called plasma filaments or blobs. For the design of plasma-facing components in future devices predictive capabilities of blob-related transport is needed and thus the understanding of the processes leading to blob g ...
... from the separatrix, an increasing fraction of it is carried by intermittent events called plasma filaments or blobs. For the design of plasma-facing components in future devices predictive capabilities of blob-related transport is needed and thus the understanding of the processes leading to blob g ...
PDF - IAEA Publications - International Atomic Energy
... fusion plasma environment; and (ii) the emergence of a knowledge based understanding of the various processes underlying materials damage and degradation, thereby leading to the identification of suitable candidate materials fulfilling the stringent requirements of a fusion environment in any next s ...
... fusion plasma environment; and (ii) the emergence of a knowledge based understanding of the various processes underlying materials damage and degradation, thereby leading to the identification of suitable candidate materials fulfilling the stringent requirements of a fusion environment in any next s ...
High power impulse magnetron sputtering discharge Linköping University Post Print
... IPVD techniques was initially mainly driven by the need to deposit metal layers and diffusion barriers into trenches or vias of high aspect ratio for integrated circuits,9,10,12–14 but has during the past years found a number of additional areas where the beneficial properties of increased ionizatio ...
... IPVD techniques was initially mainly driven by the need to deposit metal layers and diffusion barriers into trenches or vias of high aspect ratio for integrated circuits,9,10,12–14 but has during the past years found a number of additional areas where the beneficial properties of increased ionizatio ...
ABSTRACT NON-LINEAR DEVELOPMENT OF STREAMING INSTABILITIES IN MAGNETIC RECONNECTION
... problem of turbulent driven drag from reconnection, we carry out 3D simulations in which we specify the initial streaming velocities of particles to mimic the configuration of the x-line during magnetic reconnection. The geometry is chosen so that reconnection does not develop. Some important physic ...
... problem of turbulent driven drag from reconnection, we carry out 3D simulations in which we specify the initial streaming velocities of particles to mimic the configuration of the x-line during magnetic reconnection. The geometry is chosen so that reconnection does not develop. Some important physic ...
Physics of Radio-Frequency Plasmas
... narrow channel in which there is a plasma with its charged and neutral constituents in near-thermal equilibrium (all species comprising the medium having roughly the same temperature of about 10 000 K). Familiar examples can be seen in the giant sparks of lightning and in the arcs of electrical torc ...
... narrow channel in which there is a plasma with its charged and neutral constituents in near-thermal equilibrium (all species comprising the medium having roughly the same temperature of about 10 000 K). Familiar examples can be seen in the giant sparks of lightning and in the arcs of electrical torc ...
PDF
... April 2012 and August 2013 in Vienna, Austria) not only serve the purpose of code comparison, but also have applications in research of magnetic fusion, astrophysical, laserproduced plasmas, and so on. Therefore, although the first workshop was briefly reviewed elsewhere [2], and will likely be foll ...
... April 2012 and August 2013 in Vienna, Austria) not only serve the purpose of code comparison, but also have applications in research of magnetic fusion, astrophysical, laserproduced plasmas, and so on. Therefore, although the first workshop was briefly reviewed elsewhere [2], and will likely be foll ...
Modeling of the negative ion source and accelerator of the
... nuclear and particle physics (for instance to produce neutrons in the Spallation Neutron Source [2]) and in magnetic fusion devices (generation of high power neutral beams [3]). High brightness negative ion sources (i.e., which produces large negative ion currents) use cesium vapor to significantly ...
... nuclear and particle physics (for instance to produce neutrons in the Spallation Neutron Source [2]) and in magnetic fusion devices (generation of high power neutral beams [3]). High brightness negative ion sources (i.e., which produces large negative ion currents) use cesium vapor to significantly ...
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.