Plasma oscillations , also known as Langmuir waves after Irving Langmuir , are rapid oscillations of the electron density in conducting media such as Plasma physics plasmas or metal s. The oscillations can be described as an instability in the Free electron model Dielectric function of the electron gas dielectric function of a free electron gas . The frequency only depends weakly on the wavelength. The quasiparticle resulting from the Quantization physics quantization of these oscillations is the plasmon . Langmuir waves were discovered by United States American physics physicists Irving Langmuir and Lewi Tonks in the 1920s. They are parallel in form to Jeans Instability Jeans instability waves ... plasma, consisting of a gas of positively charged ion s and negatively charged electrons . If one ... density oscillates at the plasma frequency br math omega pe sqrt frac 4 pi n e e 2 m ... in astrophysics . Since the frequency is independent of the wavelength , these oscillation s have an infinite ... m e math , plasma frequency math omega pe math depends only on physical constant s and concentration of electrons math n e math . The numeric expression for plasma ordinary frequency math f pe omega ... . If the spatial scale is large compared to the Debye length , the oscillation s are only weakly ... omega k , math so the plasma waves can accelerate electrons that are moving with speed nearly equal ... and seldom of consequence. In a bounded function bounded plasma, fringing electric fields can result in propagation of plasma oscillations, even when the electrons are cold. In a metal or semiconductor ... Waves in plasmas plasmon Surface plasmon resonance Upper hybrid oscillation , in particular for a discussion ..., plasma physicists at the Universities of Texas and Michigan were able to photograph Langmuir waves ... location Berlin isbn 3540637850 Category Waves in plasmas Category Plasma physics cs Plazmov frekvence de Plasmaoszillation fr Fr quence plasma hr Langmuirov val ja pl Cz sto plazmowa ru ... more details
For oscillator disambiguation oscillation mathematics Image Simple harmonic oscillator.gif right frame An undamped Harmonic oscillator Spring mass system spring mass system is an oscillatory system. Oscillation ... used more narrowly to mean a mechanical oscillation but sometimes is used to be synonymous with oscillation ... is added to the system, the point of equilibrium is shifted. The time taken for an oscillation ... of oscillation, namely the existence of an equilibrium and the presence of a restoring force which ... by oscillation decay of the harmonic oscillator. In addition, an oscillating system may be subject .... In this case the oscillation is said to be driven oscillations driven . Some systems can be excited ... an oscillation. Coupled oscillations The harmonic oscillator and the systems it models have ... are the coupled oscillators where the energy alternates between two forms of oscillation. Well known is the Wilberforce pendulum , where the oscillation alternates between an elongation of a vertical ... oscillator Loudspeaker Microphone Optical Laser oscillation of electromagnetic field with frequency ... . Biological Circadian rhythm Circadian oscillator Lotka Volterra equation Neural oscillation Oscillating gene Human Neural oscillation Insulin release oscillations Puberty Endocrine perspective gonadotropin releasing hormone pulsations Pilot induced oscillation Voice production ColBreak Economic and social ... multidecadal oscillation Chandler wobble El Ni o Southern Oscillation Pacific decadal oscillation Quasi biennial oscillation Astrophysics Neutron star oscillations Neutron stars Cyclic Model Chemical ... system Earthquake engineering Feedback Oscillation mathematics ColBreak Oscillator phase noise Periodic function Phase noise Reciprocating motion Resonator Rhythm Seasonality Self exciting oscillation ColBreak Self oscillation Signal generator Strange attractor Structural stability Time period Tuned ... Category Oscillation Category Earthquake engineering ar az Y r alanma be ... more details
wiktionary Plasma plasm plasma plasmas Plasma may refer to Blood plasma , the yellow colored liquid component of blood, in which blood cells are suspended Plasma physics , an ionized state of matter similar to a gas Plasma display , a common application of plasma, a flat panel electronic visual display technology Plasma antenna , a type of radio antenna Plasma globe or plasma lamp novelty items that were most popular in the 1980s Milk plasma or whey , the liquid remaining after milk has been curdled and strained Plasma KDE , a reimplementation and redesign of the KDE free desktop environment for Unix Like Operating Systems, such as Linux and FreeBSD Plasma mineral , bright green chalcedony, sometimes found with small spots of jasper resembling blood drops Plasma Records , a World Record Label Plasma effect , a computer based animated visual effect, used in graphics demonstrations Plasma album Plasma album , the 2003 live album by Trey Anastasio Plasma comics , a fictional character in the Marvel Universe Cell biology Cytoplasm , a water like substance that fills cells Germplasm , describes a collection of genetic resources for an organism Germ plasm , a zone in the cytoplasm determining germ cells Nucleoplasm , a highly viscous liquid that surrounds the chromosomes and nucleoli Protoplasm , the living substance inside the cell See also Plasma cannon disambiguation , further disambiguation disambig ar an Plasma ca Plasma cs Plazma cy Plasma de Plasma et Plasma t psustus el es Plasma eu Plasma fa fr Plasma fy Plasma gl Plasma id Plasma it Plasma he sw Utegili hu Plazma egy rtelm s t lap ml ms Plasma nl Plasma ja oc Plasma nds Plasma pl Plazma ujednoznacznienie pt Plasma desambigua o ro Plasm dezambiguizare ru si simple Plasma sk Plazma sl Plazma sr sh Plazma sv Plasma olika betydelser th tr Plazma uk ur vi Plasma nh h ng ... more details
Reciprocating oscillation is an action of oscillation where the oscillation vector varies its amplitude, frequency and or displacement Multiplicative inverse reciprocally . Note not to be confused with the reciprocal of the given sinusoidal function . For example, an oscillation that changes its amplitude and thereby, for example, its displacement every cycle to half that of its initial amplitude is said to be reciprocating. Note that the term reciprocating can be used loosely to describe such an action but usually is not because such an action can be defined easily as two separate oscilations. Instead it is more commonly used to describe an oscillation in which the second definable oscillation can be defined as a non rotary cycle as its displacement. Reciprocating oscillation is an action where an oscillating body reciprocates within the oscillation, where reciprocation is distinct from just another oscillation by only jumping up and down and not oscillating about an axis. Category Dynamical systems engineering stub ... more details
Electronic oscillation is the continuous recurrence of the same electricity electrical periodic waveform . ref http dictionary.reference.com browse oscillation accessed April 01, 2007 . ref The recurrence may be in the form of a varying voltage or a varying electric current current . The waveform may be sine wave sinusoidal or some other shape when its magnitude is plotted against the duration of its cycle. Electronic oscillation may be intentionally caused, as in devices designed as oscillation oscillators , or it may be the result of unintentional positive feedback from the output of an electronic device to its input. The latter appears often in feedback amplifiers such as operational amplifier s that do not have sufficient Bode plot Gain margin and phase margin gain or phase margins . In this case, the oscillation often interferes with or compromises the amplifier s intended function. References Reflist refimprove date March 2008 Category Electronics terms Category Electronic engineering ... more details
otheruses Oscillation differential equation Image LimSup.svg right thumb 300px Oscillation of a sequence ... , oscillation is the behaviour of a sequence of real number s or a real valued function ... diverge to or that is, oscillation is the failure to have a Limit mathematics limit , and is also a quantitative measure for that. Oscillation is defined as the difference possibly between the limit ... forms or . For a sequence, the oscillation is defined at infinity, it is zero if and only if the sequence converges. For a function, the oscillation is defined at every limit point in , of the domain ... &fnof a to &fnof b infinitely many times, and does not converge. 1 x has oscillation at x 0, and oscillation 0 at other finite x and at and . sin 1 x the topologist s sine curve has oscillation 2 at x 0, and 0 elsewhere. sin x has oscillation 0 at every finite x , and 2 at and . The sequence 1, &minus 1, 1, &minus 1, 1, &minus 1, ... has oscillation 2. In the last example the sequence is Frequency periodic , and any sequence that is periodic without being constant will have non zero oscillation. However, non zero oscillation does not usually indicate periodicity. Geometrically, the graph of an oscillating ... Oscillation can be used to define continuous function continuity of a function , and is easily ... if the oscillation is zero ref http ramanujan.math.trinity.edu wtrench texts TRENCH REAL ANALYSIS.PDF ... the oscillation gives how much the function is discontinuous at a point. For example, in the classification ... is off by is the oscillation in a jump discontinuity, the size of the jump is the oscillation assuming ..., oscillation measures the failure of a limit to exist. This definition is useful in descriptive ... of the sets where the oscillation is less than hence a G delta set G sub sub ... Integral , pp. 171 177 ref The oscillation is equivalence to the definition by a simple re arrangement, and by using a limit lim sup , lim inf to define oscillation if at a given point for a given ... more details
The Antarctic oscillation AAO, to distinguish it from the Arctic oscillation or AO is a low frequency mode of variability mode of atmospheric variability of the southern hemisphere. It is also known as the Southern Annular Mode SAM or Southern Hemisphere Annular Mode SHAM . See also North Atlantic oscillation Arctic oscillation Pacific decadal oscillation Anticyclone John Michael Wallace External links http www.cpc.ncep.noaa.gov products precip CWlink daily ao index aao aao.loading.shtml http stratus.astr.ucl.ac.be textbook pdf Chapter 5.pdf chapter 5.2.3 http www.new.dpi.vic.gov.au agriculture environment and community climate understanding weather and climate climatedogs sam Animation of Southern Annular Mode in Victoria, Australia http stratus.astr.ucl.ac.be textbook chapter5 node6.html The Southern Annular Mode Introduction to climate dynamics and climate modelling, Université catholique de Louvain Climate oscillations Category Climate Category Climate pattern Category Environment of Antarctica climate stub es Oscilaci n ant rtica ja pt Oscila o ant rtica ... more details
Infobox Album See Wikipedia WikiProject Albums Name Oscillation Isolator Type Album Artist Fire Zuave Cover Released 2009 Recorded 2008 2009 Genre Americana music Americana Length ?? ?? Label unsigned Producer Reviews Last Album This Album Oscillation Isolator br 2009 Next Album Oscillation Isolator is the second album by fire Zuave . ref http www.polyvinylrecords.com store index.php?id 851 ref Released in 2009, fire Zuave continues to feature cover artwork by David Barnes . Track listing August Air Down By the Sea Harmonica Orchid Prison Break Trailor Theme 45 Caliber Will You Ever Understand I m Not Afraid of Who I Am By the Side of a Mountain References reflist Category 2009 albums ... more details
refimprove date June 2009 Pogo oscillation is a potentially dangerous type of self excited oscillation caused by combustion instability in liquid fuel rocket engine s. ref name Vibrationdata http www.vibrationdata.com Newsletters October2008 NL.pdf Apollo 13 Pogo Oscillation , Tom Irvine, Vibrationdata Newsletter, October 2008, pp. 2 6, retrieve on 18 06 2009 ref This oscillation results in variations of thrust from the engines, generally caused by variations in fuel flow rate, and placing stress on the frame of the vehicle. Although the term is frequently written POGO, it is not an acronym , but in fact a reference to the bouncing of a pogo stick . ref name Vibrationdata ref http www.hq.nasa.gov office pao History SP 350 ch 3 5.html The Perils of Pogo ref Origin In general, pogo oscillation occurs when a surge in engine pressure increases back pressure against the fuel coming into the engine, reducing engine pressure, causing more fuel to come in and increasing engine pressure again. Flexing of fuel pipes can also induce fluctuations in fuel pressure. ref http www.princeton.edu stengel ... then dangerous oscillation s can occur through positive feedback , which can in extreme cases tear the vehicle apart. Another situation in which pogo oscillation will occur is when the engine is moving ... Threshold accessdate 2009 09 11 ref The most famous pogo oscillation was in the Saturn V first stage ... upwards. The pogo oscillation occurred when this structure sprang back, lengthening the center ... the fuel flow and thus reducing thrust. At the other end of the oscillation, the fuel line was compressed, increasing fuel flow causing a sinusoidal thrust oscillation during the first stage ascent. Hazard If the oscillation is left unchecked, failures can result. One case occurred in the middle ..., modern vibration analysis methods can account for the pogo oscillation to test that it is far away ... Pogo Supressors DEFAULTSORT Pogo Oscillation Category Spacecraft propulsion ca Efecte pogo cs ... more details
The Arctic oscillation AO is an index which varies over time with no particular periodicity of the dominant ... 45N. ref http jisao.washington.edu ao Arctic Oscillation AO time series, 1899 June 2002 ref The AO ... year 1998 month title The Arctic oscillation signature in the wintertime geopotential height and temperature ... ref The North Atlantic oscillation NAO is a close relative of the AO and there exist arguments about .... Arctic Oscillation or North Atlantic Oscillation? ref Over most of the past century, the Arctic Oscillation alternated between its positive and negative phases. Starting in the 1970s the oscillation ... to a more neutral state in the last decade. The oscillation still fluctuates stochastically between .... ref http www.cpc.noaa.gov products precip CWlink daily ao index ao index.html Daily Arctic Oscillation ... Eurasia. ref http nsidc.org arcticmet patterns arctic oscillation.html The Arctic Oscillation explained ... of North America as it would during the negative phase of the oscillation. This keeps much of the United ... phase. Climatologists are now routinely invoking the Arctic Oscillation in their official ... to a negative Arctic Oscillation, which is a climate pattern that influences weather in the Northern ... Hemisphere affected by the Arctic Oscillation. A large snow storm and frigid temperatures ..., quite graphic illustration of the effects of the negative phase of the oscillation occurred in February 2010. In that month, the Arctic Oscillation reached its most negative monthly mean value, 4.266 ... not be overstated. It is by no means a simple, one to one equivalence. An extreme Arctic Oscillation ... believe that the Arctic Oscillation affects the probability of certain weather events occurring ... the severity of the weather associated with it. See also North Atlantic oscillation Antarctic oscillation Pacific decadal oscillation Anticyclone Atlantic Ocean North Atlantic Current John Michael Wallace ... BBC news, Tuesday, 5 January 2010 Climate oscillations DEFAULTSORT Arctic Oscillation Category Climate ... more details
Parasitic oscillation is an undesirable oscillation caused by feedback . The problem occurs notably in RF power amplifier RF ref cite book last Whitaker first Jerry C. title The electronics handbook year 2005 publisher CRC Press isbn 9780849318894 pages 404 url http books.google.com books?id FdSQSAC3 EwC&pg PA404 ref , audio amplifier audio , and other electronic amplifier s ref cite book last Weber first Gerald title A Desktop Reference of Hip Vintage Guitar Amps year 1994 publisher Hal Leonard isbn 9780964106000 pages 220 url http books.google.com books?id fvUVBP3wW1gC&pg PA220 ref as well as in digital signal processing . ref cite book last Wanhammar first Lars title DSP integrated circuits year 1999 publisher Academic Press isbn 9780127345307 pages 188 url http books.google.com books?id k bbNlEyFSgC&pg PA188 ref It is one of the fundamental issues addressed by control theory . ref Richard R Spencer & Ghausi MS 2003 . Introduction to electronic circuit design. Upper Saddle River NJ Prentice Hall Pearson Education. pp. 661. ISBN 0 201 36183 3. http worldcat.org isbn 0 201 36183 3. ref ref Araki, M., PID Control, http www.eolss.net ebooks Sample 20Chapters C18 E6 43 03 03.pdf ref ref P. Horowitz & W. Hill The Art of Electronics Cambridge University Press 1980 Chapter 3, relating to operational amplifiers. ref Parasitic oscillation is undesirable for several reasons. The oscillations ... oscillation may generate enough power to damage connected Loudspeaker speakers . A circuit that is oscillating ... pulses and count erratically. Causes of parasitic oscillation Parasitic oscillation in an amplifier ..., impedance in the power supply can couple input to output and cause oscillation. When a common power ... the problem of parasitic oscillation in Servomechanism servo control systems &ndash the system oscillated ... stability criterion for oscillation is that the product of the stage gain multiplied by the transfer ... are used to prevent parasitic oscillation. Amplifier circuits are laid out so that input and output ... more details
Unreferenced date December 2010 A transient event is a short lived burst of energy in a system caused by a sudden change of state. The source of the transient energy may be an internal event or a nearby event. The energy then couples to other parts of the system, typically appearing as a short burst of oscillation. Electromagnetics Main Electromagnetic pulse In electrical engineering electrical and electronic engineering such electromagnetic pulses EMP occur internally as the result of the operation of switching devices. Engineers use voltage regulator s and surge protector s to prevent transients in electricity from affecting delicate equipment. External sources include lightning LEMP , electrostatic discharge ESD and nuclear EMP NEMP . Within Electromagnetic compatibility testing, transients are deliberately administered to electronic equipment for testing their performance and resilience to transient interference. Many such tests administer the induced fast transient oscillation directly, in the form of a damped sine wave , rather than attempt to reproduce the original source. International standards define the magnitude and methods used to apply them. The European standard for Electrical Fast Transient EFT testing is EN 61000 4 4. The U.S. equivalent is IEEE C37.90. Both of these standards are similar. Which standard you choose is based on the intended market. Acoustics main Transient acoustics The typical sound of some musical instrument s is also characterized by transients, which can be heard when striking a percussion instrument or the strings of a string instrument . See also Transience disambiguation Category Oscillation Electric stub engineering stub de Transienten es R gimen transitorio electr nica fr Transitoire pt Transiente ru sv Transient uk fi Transientti ... more details
File Holocene Temperature Variations.png thumb 300px The Piora Oscillation was an abrupt cold and wet period in the climate history of the Holocene Epoch it is generally dated to the period of c. 3200 to 2900 BCE . ref http www.news about space.org story 2409.html Space and Earth Science News article summarizes evidence for sudden global cooling 5.2K years BP ref Some researchers associate the Piora Oscillation with the end of the Atlantic climate regime, and the start of the Sub Boreal, in the Blytt Sernander sequence of Holocene climates. The spatial extent of the change is unclear it does not show up as a major, or even identifial, event in hemispheric temperature reconstructions The phenomenon is named after the Val Piora or Piora Valley in Switzerland, where it was first detected some of the most dramatic evidence of the Piora Oscillation comes from the region of the Alps . ref Lamb, pp. 124, 128, 143. ref Glaciers advanced in the Alps, apparently for the first time since the Holocene climatic optimum the Alpine tree line dropped by 100 meters. Yet the climate change extended far beyond the Alps and Europe. It affected what is now the New England region of North America, where tsuga hemlock and elm trees suffered a dramatic decline Citation needed date October 2009 . Similar evidence comes from California and elsewhere some changes in flora proved permanent Citation needed date October 2009 . In the Middle East, the surface of the Dead Sea rose nearly 100 meters 300 feet , then receded to a more usual level. A few commentators have associated the climate changes of this period with the end of the Uruk period , as a Dark Ages in history Dark Age associated with the floods .... ref The Piora Oscillation has also been linked to the domestication of the horse. In Central Asia ... weather in the central Sahara. The cause or causes of the Piora Oscillation are debated. A Greenland ... impact event . Other authorities associate the Piora Oscillation with other comparable events ... more details
The Aller d period was a warm and moist global interstadial that occurred at the end of the last glacial period . The Aller d oscillation raised temperatures in the northern Atlantic region to almost present day levels , before they declined again in the succeeding Younger Dryas period, which was followed by the present interglacial period. In some regions, especially in northern Eurasia , there is evidence for a cold period known as the Older Dryas interrupting the interstadial. In such regions the shorter oscillation ending with the Older Dryas is known as the B lling oscillation , and the Aller d period is the interstadial following the Older Dryas. The Aller d period was named after a type site in Aller d municipality in Sj lland , Denmark near Copenhagen , where deposits created during the period were first identified in work published in 1901 by Nikolaj Hartz Hartz and Milthers. This Blytt Sernander period corresponds to Pollen zone II. Dating The start of the Aller d depends on whether an Older Dryas is present and how much time is to be allotted to the latter. A conventional date of 14,000 BP is typical. Roberts 1998 uses 13,000 BP for the end of the period. The Greenland Oxygen isotope record shows the warming identified with the Aller d to be after about 14,100 BP and before about 12,900 BP. C 14 dates from an excavation on the shore of Lake Neuchatel , Switzerland , furnish a date of 14,000 BP, calibrated, for the start of the Aller d. Pollen cores from Berezina plain, Belarus , give 11,800 10,900 BP uncal. Various researchers have similar ranges 12,000 11,000, 11,700 11,000, etc. They all seem to roughly concur. The interstadial ended abruptly with a cold period that reduced temperatures back to near glacial levels within a decade. ref Nicholas Wade Wade, Nicholas , Before the Dawn , Penguin Press, 2006. pp. 123 ref The Aller d occurred during the last interstadial of the Pleistocene the Windermere of Great Britain Britain , the Woodgrange of Ireland and ... more details
The B lling oscillation was a warm interstadial period between the Oldest Dryas and Older Dryas stadial s, at the end of the last glacial period . It is named after a peat sequence discovered at B lling lake , central Jutland . It is used to describe a period of time in relation to Pollen zone Ib in regions where the Older Dryas is not not DOUBLE NEGATIVE TYPO?? detected in climatological evidence, the B lling Aller d is considered a single interstadial period. Dates The beginning of the B lling is also the high resolution date for the sharp temperature rise marking the end of the Oldest Dryas at 14,670 Before Present BP . Roberts 1998 uses 15,000. A range of 14,650 14,000 BP calibrated has been assigned to the B lling layer of the excavation at Lake Neuch tel , Switzerland , 1992 1993. The Oxygen isotope record from Greenland ice includes the B lling warm peak between 14,600 and 14,100 BP. Most of the recent dates available fall within a few hundred years of these. Flora Of the two periods, B lling and Aller d Oscillation Aller d , B lling is the warmer and came on more suddenly. During it sea level rose more than 100 m due to glacial melt. Ice uncovered large parts of north Europe and temperate forests covered Europe from 29 deg. to 41 deg. north latitude . After some pioneer vegetation, such as Salix polaris and Dryas octopetala , hardwoods, such as Quercus , and softwoods, Betula and Pinus , spread northward for a brief few hundred years. Fauna During this time late Pleistocene animals spread northward from refugia in the three peninsulas, Spain, Italy and the Balkans . Geneticists can identify the general location by studying degrees of consanguinity in the modern animals of Europe. The hunting camps of ancient humans remain a major source of fauna animals fauna l fossil s. Animals hunted by man are predominantly the big game mammals reindeer , horse , saiga , antelope ... and Federmesser Cultures Geological history p c DEFAULTSORT Bolling Oscillation Category ... more details
implies that trains sway from side to side all the time. In fact, this oscillation is Damping ... methods dealing with this class of problem, see Control engineering DEFAULTSORT Hunting Oscillation Category Oscillation Category Rail technologies de Sinuslauf ko ja ... more details
Neural oscillation is rhythmic or repetitive neural activity in the central nervous system . Neural tissue can generate oscillatory activity in many ways, driven either by mechanisms localized within individual neurons or by feedback interactions among populations of neurons. In individual neurons, oscillations can appear either as subthreshold rhythms of membrane potential rise and fall, or as rhythmic increases and decreases in action potential activity, which then produce rhythmic activation of synapses in target neurons. At the level of neural population, synchronized oscillations of large numbers of neurons can give rise to macroscopic oscillatory electric fields, which can be observed in the electroencephalography electroencephalogram EEG . Image SimulationNeuralOscillations.png thumb right 400px Simulation of neural oscillations at 10 Hertz Hz . Upper panel shows spiking of individual neurons with each dot representing an individual action potential within the population of neurons , and the lower panel the local field potential reflecting their summed activity. Overview EEG signals oscillate across a range of frequencies. Scientists have defined a set of frequency bands which group specific ranges of frequencies from this spectrum. The first discovered and best known frequency band is alpha waves alpha activity 8&ndash 12 Hz . ref cite journal author Berger H last2 Gray first2 CM title Uber das Elektroenkephalogramm des Menschen journal Arch Psychiat Nervenkr volume ... is an example of a limit cycle oscillation in that the frequency of beats varies widely, while ..., these pathological oscillations often consist of an aberrant version of a normal oscillation. For example, one of the best known types is the spike and wave oscillation, which is typical ... article Synchronization Synchronization DEFAULTSORT Neural Oscillation Category Neuroscience ... Category Computational neuroscience ca Oscil laci neural fr Oscillation neurale ... more details
Plasma Wakefield acceleration is a technique for accelerating charged particle s, such as electron s, positron s and ion s, using an electric field associated with an Plasmaoscillation electron plasma ... pulses, a technique known as laser plasma acceleration . These techniques appear to offer a way to build ... better than current particle accelerators. For example, an experimental laser plasma accelerator ... at SLAC achieved an energy gain to 42 GeV over 85 cm using a plasma wakefield accelerator 8.9x10 sup ... plasma wakefield accelerator. Nature journal Nature 445 741 744 doi 10.1038 nature05538 ref Once ... in hospitals and research facilities. Basic concept A Plasma physics plasma consists of fluid of positive ... the plasma will be macroscopically neutral, an equal mix of electron s and nucleon s in equilibrium. However, if an external electric field is applied, the plasma will separate, with the particles being attracted to the external field. A particle injected into such a plasma would be accelerated ... the plasma. Such a wave can be created by applying a high power laser or electron pulse into a properly prepared plasma. As the pulse travels through the plasma, the electric field of the light ... it appears that a bubble of charge is moving through the plasma at close to the speed ... to a small area of very strong potential gradient following the laser pulse. Image Illustration Plasma Wakefield Acceleration.png thumb 400px Wake created by an electron beam in a plasma It is this wakefield that is used for particle acceleration. A particle injected into the plasma near the high ... to colloquially as surfatron s. The advantage of plasma acceleration is that its acceleration field ... in a plasma is defined by mechanical qualities and turbulence, but is generally several orders of magnitude ... be created based on plasma acceleration techniques or accelerators for much higher energy can be built, if long accelerators are realizable with an accelerating field of 10 GV m. Plasma acceleration is categorized ... more details
plasmaoscillation s of the electrons is large compared to the electron neutral collision frequency ...Other uses Plasma disambiguation Plasma THIS ARTICLE HAS BEEN STARTED IN US SPELLING. PLEASE KEEP PER WP ENGVAR Image Plasma lamp 2.jpg thumb 300px right Plasma globe Plasma lamp , illustrating some of the more complex phenomena of a plasma, including Current filament filamentation . The colors are a result ... and chemistry , plasma is a state of matter similar to gas in which a certain portion of the particles ... it into a plasma containing charge physics charge d particles, positive ions and negative electrons. ref name Sturrock The presence of a non negligible number of charge carrier s makes the plasma ... s. Plasma, therefore, has properties quite unlike those of solid s, liquid s, or gas es and is considered a distinct state of matter . Like gas, plasma does not have a definite shape or a definite ... s. Plasma was first identified in a Crookes tube , and so described by Sir William Crookes in 1879 ... GIUNTA thomson1897.html year 1897 ref and dubbed plasma by Irving Langmuir in 1928, ref name ... it reminded him of a blood plasma . Langmuir wrote blockquote Except near the electrodes, where there are sheaths ... equal numbers so that the resultant space charge is very small. We shall use the name plasma to describe ... Common plasmas see Astrophysical plasma Interstellar medium Intergalactic space Plasmas are by far ... stated that more than 99 of the material in the visible universe is plasma. See, for example, cite book author D. A. Gurnett, A. Bhattacharjee title Introduction to Plasma Physics With Space and Laboratory ..., however, is found in the intergalactic medium , which is also a plasma, but much hotter, so ... energy density in the universe is not plasma or any other form of ordinary matter, but a combination of cold dark matter and dark energy . ref All the star s are made of plasma, and even the space between the stars is filled with a plasma, albeit a very sparse one. In our solar system, the planet ... more details
Unreferenced date December 2009 Plasma processing is a Plasma physics plasma based material processing technology that aims at modifying the chemical and physical properties of a surface. Plasma processing techniques include Plasma activation Plasma modification Plasma functionalization Plasma polymerization Plasma cleaning Plasma Surface Interactions Plasma electrolytic oxidation Related topics are plasma chemistry , chemical vapor deposition , and physical vapor deposition processes like sputter deposition , plasma ion doping , vacuum plasmaspraying , and reactive ion etching . DEFAULTSORT Plasma Processing Category Plasma processing ru ... more details
math omega ci eB m ic 9.58 times 10 3 Z mu 1 B mbox rad s , math electron plasma frequency , the frequency with which electrons oscillate plasmaoscillation math omega pe 4 pi n ee 2 m e 1 2 5.64 times 10 4 n e 1 2 mbox rad s math ion plasma frequency math omega pi 4 pi n iZ 2e 2 m i 1 2 1.32 times ... average de Broglie wavelength of electrons in a plasma math Lambda e sqrt frac h 2 2 pi m ekT ... field math r i v Ti omega ci 1.02 times10 2 , mu 1 2 Z 1 T i 1 2 B 1 , mbox cm math plasma skin depth , the depth in a plasma to which electromagnetic radiation can penetrate math c omega pe 5.31 times10 ... in so called star mode characterized by rays of glowing plasma which appear to emanate from the gaps ... math Alfv n velocity speed of light math v A c 7.28 , mu 1 2 n i 1 2 B math electron plasma gyrofrequency ratio math omega pe omega ce 3.21 times10 3 ,n e 1 2 B 1 math ion plasma gyrofrequency ratio math omega pi omega ci 0.137 , mu 1 2 n i 1 2 B 1 math thermal magnetic pressure ratio Beta plasma physics ... 2 8 pi n im ic 2 26.5 , mu 1 n i 1 B 2 math References http www.ipp.mpg.de dpc nrl NRL Plasma Formulary ... erences tags references div Categories Category Plasma physics Category Astrophysics zh ... more details
unreferenced date December 2010 incoherent topic A plasma torch or plasma arc or plasma gun is technology invented to generate a directed flow of Plasma physics plasma from its nozzle. The plasma jet can be used for a number of applications such as Plasma cutting , Plasma spraying , Plasma arc waste disposal which is used to reduce waste to power generation power generating gas and construction rubble . Distinguish from science fiction plasma weapon s depicted as varieties of raygun s. External links http www.plasmaindia.com images torch.jpg torch.jpg JPEG image, 297x209 pixels Category Plasma physics Category Plasma processing Category Sustainable technologies tech stub tool stub af Plasmabrander fr Torche plasma it Torcia al plasma pl Plazmotron ru ... more details
In the afterglow of a Plasma physics plasma , also known as remote plasma , the external electromagnetic field s that sustained the plasma glow are absent or insufficient to maintain the discharge. A plasma afterglow can either be a temporal, due to an interrupted pulsed plasma source , or a spatial one, due to a distant plasma source. In the afterglow, plasma generated species de excite and participate in secondary chemical reactions that tend to form stable species. Depending on the gas composition, super elastic collisions may continue to sustain the plasma in the afterglow for a while by releasing the energy stored in rovibronic excitation rovibronic degrees of freedom of the atoms and molecules of the plasma. Especially in molecular gases, the plasma chemistry in the afterglow is significantly different from the plasma glow. References reflist noreferences date September 2010 Category Plasma physics Category Articles lacking sources from June 2009 Category All articles lacking sources physics stub zh ... more details
Plasma cannon may refer to Shiva Star , a research project Plasma powered cannon , an experimental weapon which uses plasma to fire a solid projectile A weapon that magnetizes a ball of Plasma physics plasma and uses electromagnets to drag and fire it, the same mechanism used in coilgun s See also Plasma disambiguation Plasma weapon fiction disambig ... more details
unreferenced date April 2010 Magnetic confinement fusion Magnetically confined fusion plasma physics plasma s such as those generated in tokamak s and stellarator s are characterized by a typical shape. Plasma shaping is the study of the plasma shape in such devices, and is particularly important for next step fusion devices such as ITER . This shape is conditioning partly the performance of the plasma. Tokamaks, in particular, are axisymmetric devices, and therefore one can completely define the shape of the plasma by its cross section . Cross section In the simple case of a plasma with up down symmetry, the plasma cross section is defined using a combination of four parameters the plasma elongation, math kappa b over a math , where math a math is the plasma minor radius, and math b math is the height of the plasma measured from the equatorial plane . br the plasma triangularity, defined as the horizontal distance between the plasma major radius math R math and the X point. br the angle between the horizontal and the plasma last closed flux surface LCFS at the low field side. br the angle between the horizontal and the plasma last closed flux surface LCFS at the high field side. br Category Plasma physics ... more details
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