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Topic: Plasma scaling


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In the News (Fri 27 Nov 09)

  
  PowerPedia:Plasma - PESWiki
Plasma properties are strongly dependent on the bulk (or average) parameters.
Plasma temperature is commonly measured in Kelvin or electron volts, and is (roughly speaking) a measure of the thermal kinetic energy per particle.
The dynamics of plasmas interacting with external and self-generated magnetic fields are studied in the academic discipline of magnetohydrodynamics.
peswiki.com /index.php/PowerPedia:Plasma   (4635 words)

  
  Plasma (physics) Encyclopedia @ LaunchBase.org (Launch Base)   (Site not responding. Last check: 2007-11-01)
Plasma temperature is commonly measured in Kelvin or electron volts, and is (roughly speaking) a measure of the thermal kinetic energy per particle.
The dynamics of plasmas interacting with external and self-generated magnetic fields are studied in the academic discipline of magnetohydrodynamics.
While electric fields in plasmas are usually small due to the high conductivity, the electric field associated with a plasma moving in a magnetic field is not affected by Debye shielding.
www.launchbase.org /encyclopedia/Plasma_(physics)   (2882 words)

  
 Encyclopedia :: encyclopedia : Plasma physics   (Site not responding. Last check: 2007-11-01)
In physics and chemistry, a plasma is an ionized gas, and is usually considered to be a distinct phase of matter.
The ion temperature in a cold plasma is often near the ambient temperature.
For many purposes the electric field in a plasma may be treated as zero, although when current flows the voltage drop, though small, is finite, and density gradients are usually associated with an electric field according to the Boltzmann relation.
www.hallencyclopedia.com /Plasma_physics   (2891 words)

  
 Plasma (physics) - Wikipedia, the free encyclopedia
In physics and chemistry, a plasma is typically an ionized gas, and is usually considered to be a distinct phase of matter in contrast to solids, liquids and gases.
Plasma parameters can take on values varying by many orders of magnitude, but the properties of plasmas with apparently disparate parameters may be very similar (see plasma scaling).
A plasma that has a significant excess of charge density or that is, in the extreme case, composed of only a single species, a called a non-neutral plasma.
en.wikipedia.org /wiki/Plasma_(physics)   (3854 words)

  
 Articles - Plasma (physics)   (Site not responding. Last check: 2007-11-01)
This is especially common in cold plasmas, where the ions are often near the ambient temperature.
While electric fields in plasmas are usually small due to the high conductivity, the electric field associated with a plasma moving in a magntic field is not affected by Debye shielding.
Plasmas may be usefully described with various levels of detail (see Plasma parameters).
www.ibxn.com /articles/Plasma_(physics)   (2609 words)

  
 TFTR L~mode energy confinement
The common L mode confinement scaling law on TFTR is also inversely proportional to the volume of wall material that is heated to a high temperature, possibly the temperature at which the deuterium sorbed in the material becomes detrapped and highly mobile.
L mode scaling differs from supershot scaling since L mode confinement depends on the plasma current and the auxiliary heating power, while supershot confinement depends upon hydrogenic influxes (or parameters associated with those influxes) and is independent of the plasma current and applied heating power.
H mode onset does superficially resemble the TFTR supershot scaling due to the coincident reduction of the deuterium influx at the onset of the confinement enhancement, and similar studies of H mode data are warranted.
epub.iaea.org /fusion/subscribe/39/sep/ms6761StracJ/6761.html   (2117 words)

  
 Plasma (physics) - WebArticles.com
In physics and chemistry, a plasma is an ionized gas, and is usually considered to be a distinct phase of matter.
Due to the good electrical conductivity, the electric fields in plasmas tend to be very small, although where double layers are formed, the potential drop can be large enough to accelerate ions to relativistic velocities and produce synchrotron radiation such as x-rays and gamma rays.
For many purposes the electric field in a plasma may be treated as zero, although when current flows the voltage drop, though small, is finite, and density gradients are usually associated with an electric field according to the Boltzmann relation.
www.webarticles.com /print.php?id=390   (2030 words)

  
 Advanced Accelerator Concepts Workshop
The particle beam drives a plasma wave and generates a strong wakefield which has a phase velocity equal to the velocity of the beam and can be used to accelerate part of the drive beam or a trailing beam.
This scaling is predicted to hold despite the onset of a relativistic, nonlinear response by the plasma, when the number of beam particles occupying a cubic plasma skin-depth exceeds that of plasma electrons within the same volume.
The peak accelerating field in the plasma wave excited behind the finite-length beam is also examined, with the artifact of wave spiking adding to the apparent persistence of linear scaling of the peak field amplitude into the nonlinear regime.
www.bnl.gov /ATF/Meetings/AAC04/abstractlebeam.htm   (1003 words)

  
 Plasma TV Shopper: Check Latest Prices, Compare Plasma TVs and Read Reviews   (Site not responding. Last check: 2007-11-01)
Most of the plasma tvs on the market today are capable of projecting input signals other than their native resolutions.
The plasma tv’s process of converting a different input format to its native output format is called "scaling." Some plasma screen tvs are very good at scaling, so the resulting image fuzziness is relatively minor, and the image is very adequate no matter what the source.
If scaling is an important consideration, be sure you see it demonstrated as you would use it.
www.plasmatvshopper.com /plasma-computer-monitor-17.shtml   (339 words)

  
 Plasma and flat tv use for computer applications
Most of the plasma tvs on the market today are capable of projecting input signals other than their native resolutions.
The plasma tv’s process of converting a different input format to its native output format is called "scaling." Some plasma screen tvs are very good at scaling, so the resulting image fuzziness is relatively minor, and the image is very adequate no matter what the source.
The quality of scaling varies widely among plasma tvs and like all technology, it is constantly being improved.
www.plasmatvbuyingguide.com /plasma-computer-monitor-17.html   (364 words)

  
 LG Plasma TVs | Plasma TV Reviews UK : Compare HD Plasma Televisions
Plasma televisions have become very popular in the recent years because of the clarity in the display, the realistic sound effects and long life span.
This plasma TV supports a native aspect ratio of 16:9 and an interpolated aspect ratio of 4:3 and 14:9.
The LG 42PX4R plasma TV also supports 3 SCART connections where a scart connector is a physical and electrical interconnection between two pieces of audio-visual equipment, such as a television set and a videocassette recorder.
www.plasmatvreviews.org.uk /category/lg-plasma-tvs   (3639 words)

  
 AIAS - Questions
Myron When considering the scaling of plasma processes from the tiny to the astronomical compare Hubble gallery image third from left on the third row from the bottom object NGC 6751 with the picture of the plasma filaments produced by a focus fusion reactor.
The plasma universe is of course also a mixture of rotation and translation or torsion and curvature, as is everything in ECE theory.
Incorporating plasma physics into ECE is no problem and it seems much more likely that the universe is filled not with dark matter, but with plasma as inferred by Alfven, Lerner et al.
wc3.worldcrossing.com /webx?14@@.1de09f7d/25   (1602 words)

  
 envisiontek plasma tv screen, digitial projectors Plasma Television Technology, Consumer Reports Plasma Television, ...   (Site not responding. Last check: 2007-11-01)
Plasma Screen TVs are an array of cells, known as pixels, which are composed of 3 sub-pixels, corresponding to the colors red, green and blue.
Plasma technology is different from that used in other display systems in that red, green and blue lights are created in every pixel, reducing the need for space.
Plasma displays are not the same as an LCD screen, like those on laptop PC's or the ones that you see on commercial jetliners.
www.envisiontek.com /category/guide   (4583 words)

  
 Plasma (physics) information - Search.com
In physics and chemistry, a plasma is typically an ionized gas, and is usually considered to be a distinct phase of matter in contrast to solids, liquids and gases.
Since the space between the stars is filled with a plasma, although a very sparse one (see interstellar- and intergalactic medium), essentially the entire volume of the universe is plasma (see astrophysical plasmas).
While electric fields in plasmas are usually small due to the high conductivity, the electric field associated with a plasma moving in a magnetic field is not affected by Debye shielding.
www.search.com /reference/Plasma_(physics)   (3347 words)

  
 MENC-Micro and Nano Engineering Center
Scaling of plasma sources down to small sizes for use in microsystems is a current project of Timothy Grotjohn and Jes Asmussen.
This project is funded by the National Science Foundation and it is investigating and establishing the scientific basis and engineering principles for the design and operation of small microwave plasma sources with discharge dimensions ranging from 0.2-10 millimeters.
Past investigations on microwave discharges by researchers have primarily focused on discharges that were a few centimeters to almost a meter in size.
www.egr.msu.edu /~hogant/Cleanroom/miniature1.html   (314 words)

  
 MrSci.com: All Science, All the Time
This fourth state of matter was first identified by Sir William Crookes in 1879 and dubbed "plasma" by Irving Langmuir in 1928, because it reminded him of a blood plasma.
Alfven also noted that due to their electric charge, very small grains also behave as ions and form part of a plasma (see dusty plasmas).
The term plasma is generally reserved for a system of charged particles large enough to behave as one.
www.mrsci.com /physics/plasma.html   (2229 words)

  
 Session CP1 - Poster Session II.
In the Large Plasma Device (LAPD) at UCLA we are investigating the reflection of shear Alfvén waves from surfaces of various conductivities, ranging from insulating to conducting.
Though high temperature and high density plasma which is compressed by uniform implosion lasers was necessary for central ignition scheme, only high density core plasma is necessary for the fast ignition scheme, because core plasma is heated by the ultra-intense laser beam to be enough high temperature to be ignited.
The imploded core plasma was found to have strongly nonuniform structure due to the presence of the cone, and to be interacting with the tip of the cone.
flux.aps.org /meetings/YR03/DPP03/baps/abs/S380.html   (19422 words)

  
 Plasma Depot: Pioneer Plasma Screen: PDP-507CMX HDTV Plasma
Another new technology developed specifically for the PDP-507CMX plasma display, the New First-Surface Pure Color Filter is an industrial-grade filter bonded directly to the plasma glass to reduce glare and light reflection, resulting in higher color accuracy and better contrast in any lighting conditions.
Scaling performance has been enhanced to ensure that even high-definition signals are reproduced with minimal data loss and artifacts.
Designed to complement your plasma monitor, these side-mounted speakers are the same height and depth as your plasma TV, and approx.
www.plasmadepot.com /pioneer_plasma_tv/pdp507cmx.php   (917 words)

  
 Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
Usually, tokamak core scaling laws are written in terms of dimensionless geometrical quantities and parameters corresponding to Coulomb collisionality, gyro-motion, and plasma beta.
He obtained a scaling indicating that none of the present tokamaks could be made similar to the International Thermonuclear Experimental Reactor (ITER)[G. Janeschitz{ital et al.}, J. Nucl.
In this reactor relevant regime, scaling law information must be obtained experimentally and by complex numerical simulations.
www.osti.gov /energycitations/product.biblio.jsp?osti_id=639076   (380 words)

  
 Plasma Processing   (Site not responding. Last check: 2007-11-01)
Fundamental understanding of plasma processes is now sufficient that plasma models are emerging as tools for the developing new plasma equipment and processes, as well as, the diagnosing process difficulties.
In addition, plasma diagnostics are now being implemented as process monitors, end point detectors, and process controllers to improve processing flexibility and reliability.
Studied the ion-enhance surface kinetics that are responsible for directional plasma etching using beams to simulate the fluxes which impinge on the surfaces during processing.
plasma-processing.com   (4334 words)

  
 Articles - Plasma physics   (Site not responding. Last check: 2007-11-01)
In physics and chemistry, a plasma is typically an ionized gas, and is usually considered to be a distinct phase of matter.
Plasma typically takes the form of neutral gas-like clouds or charged ion beams, but may also include dust and grains (called dusty plasmas) They are typically formed by heating and ionizing a gas, stripping electrons away from atoms, thereby enabling the positive and negative charges to move freely.
Double layers are found between adjacent plasmas regions with different physical characteristics, and in current carrying plasmas.
www.cbasket.com /articles/Plasma_physics   (2619 words)

  
 Scaling of plasma turbulence suppression   (Site not responding. Last check: 2007-11-01)
Scaling of plasma turbulence suppression with velocity shear
The scaling of plasma turbulence, turbulent particle flux and cross-phase with shear in the edge of the TEXTOR-94 tokamak is obtained from measurements from fast scanning probes and compared with various existing analytical theories.
It is found that the scaling can be expressed as a second order polynomial and that the cross-phase plays a key role in the suppression of particle flux.
stacks.iop.org /0029-5515/42/117   (293 words)

  
 UCLA PBPL - PBPL literature
Through computational analysis of the plasma electron motion and the associated wake fields, it is shown that if the beam is dense enough to eject nearly all of the plasma electrons from the beam channel then the short-range wake fields are of excellent quality for acceleration and focusing of electron beams.
A plasma based electron beam source apparatus is described which creates a plasma with two distinct density regions separated by a transition which is shorter than the plasma skin depth kp^−1 of either region.
A plasma based electron beam source apparatus is described which creates a plasma with two distinct density regions separated by a transition which is shorter than the plasma skin depth $k^{-1}_{p}$ of either region.
pbpl.physics.ucla.edu /Literature/docserver.php?browse=year   (10120 words)

  
 News and Views From The Electric Universe
Plasma physicists note that plasma filamentation is known to occur over at least 14 orders of magnitude of current, from microamperes to multi-megaamperes.
Plasma cosmology has no problem explaining the ubiquitous spiral shape of galaxies and reproducing it in the plasma laboratory.
The dense plasma focus, first invented in 1954, consists of two coaxial cylindrical electrodes usually less than 30 cm in all dimensions in a gas-filled vacuum chamber connected to a capacitor bank.
www.holoscience.com /news.php?article=tyybhrr8   (3537 words)

  
 Panasonic Plasma TV Display panasonic plasma screen
Plasma display panels use a self illuminating system to boost resolution in images with fast motion.
With movie scenes especially, the new plasma displays create the kind of faithful ambience that were difficult for previous systems to deliver.
By skipping the scaling process, this mode is able to produce high-definition images in their original, 1:1 pixel form.
www.plasma.com /panasonicplasma/panasonic_plasma.htm   (1661 words)

  
 (EX4/5) Confinement in the RFP: Lundquist Number Scaling, Plasma Flow, and Reduced Transport
Global heat and particle transport in the reversed field pinch (RFP) result primarily from large-scale, resistive MHD fluctuations which cause the magnetic field in the core of the plasma to become stochastic.
The electrostatic current injection, localized in the edge plasma, reduces edge resonant fluctuations and improves the energy confinement.
In addition, regimes with confinement improvement associated with the plasma flow profile are attained.
www.iaea.org /programmes/ripc/physics/html/node54.htm   (320 words)

  
 Beta Scaling
The scaling of the transport at constant magnetic field and at constant collisionality is shown here.
When doing the scaling in normalised units, one must multiply the result by a factor of alpha_M^(1/2) in order to un-do the normalisation [if it were done at constant density the factor would be alpha_M^(1/2) because the normalised units for the transport scale like T^(3/2), where T is the temperature].
A similar but undiagnosed result for an ITG case relevant to the hot core regions of the plasma is presented in a recent Phys Plasmas paper by Snyder and Hammett.
www.ipp.mpg.de /~bds/posters/betas   (489 words)

  
 PRESOL | A | Notice of Intent to Award a Sole Source Contract for Research to the University of Notre Dame | 10-Mar-02 ...
Various geometric configurations of these actuators will be placed just upstream, directly under and just downstream of weak shocks formed in a transonic flow, and the changes in the shocks' properties from their undisturbed values will be documented.
These plasma flaps have already been demonstrated to be effective in 50 ft/s flows; the continued work will concentrate on scaling these low-speed results to higher speeds more applicable to munitions applications.
Employ static pressure taps, total pressure probes, and plasma actuators as necessary to determine if plasma actuators can be used to adjust shock wave and placement on munitions performance.
www.fbodaily.com /archive/2002/03-March/10-Mar-2002/FBO-00038250.htm   (605 words)

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