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	Encyclopedia: Electron gun
		An electron gun is a component that produces an electron stream that has a precise kinetic energy, being used in all TVs and monitors which use cathode ray tube technology, and in other instruments, eg.
		Thermionic emission (archaically known as the Edison effect) is the flow of electrons from a metal or metal oxide surface, caused by thermal vibrational energy overcoming the electrostatic forces holding electrons to the surface.
		The electron gun starts with a small heater, which is a lot like the hot, bright filament of a regular light bulb.
	www.nationmaster.com /encyclopedia/Electron-gun (613 words)

	Electron gun for cathode ray tube - US Patent 6642658 (Site not responding. Last check: 2007-11-03)
		The electron gun of claim 1 wherein an inner diameter of the lower cylinder is approximately 50-65% of an inner diameter of the upper cylinder.
		The electron gun of claim 4 wherein a part of the lower cylinder is disposed in the one end portion of the anode electrode, and a gap between the upper cylinder and the anode electrode is greater than a gap between the lower cylinder and the one end portion.
		Therefore, the electron gun of the CRT emits electron beams having a relatively high current density, and each electrode of the electron gun is designed to be applied with a relatively high voltage to form electron lenses.
	www.patentstorm.us /patents/6642658.html (2402 words)

	[No title] (Site not responding. Last check: 2007-11-03)
		An electron gun is used in devices such as travelling wave tubes and other vacuum electron devices to generate a beam of electrons.
		In a typical electron gun, the control grid may be biased slightly positive with respect to the cathode, say 100 V where the cathode is at high potential, to switch on the electron beam such that electrons generated at the cathode are accelerated towards the anode.
		The electron gun 1 includes a thermionic cathode 4 of electron emissive material having a concave front surface which is located in front of a heater shown schematically at 5.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=98/54744.981203&ELEMENT_SET=DECL (1364 words)

	Electron gun with electrostatic shielding and method of assembly therefor - US Patent 5394054 (Site not responding. Last check: 2007-11-03)
		A further object of the present invention is to facilitate assembly of an electron gun incorporating an Einzel lens using a cylindrical mandrel for supporting the grids of the lens in alignment during assembly.
		Electron gun 60 further includes a G1 control grid 64 and a G2 screen grid 66 having aligned apertures for passing the energetic electrons in the form of a beam shown as element 73 (in dotted-line form) toward the faceplate of a CRT (not shown).
		Electron gun 60 further includes a G3 grid 68, a G4 grid 70, and a G5 grid 72 which in combination form an Einzel lens for focusing the electron beam 73 on the CRT's faceplate.
	www.patentstorm.us /patents/5394054.html (3862 words)

	Electron gun device for controlling the potential of a body in space - Patent 5321336
		The cathode of an electron gun is connected to the body of a space vehicle, performing an automatic limitation (or neutralization) of the negative potential (measured with respect to the physical entity toward which the electron beam is directed, i.e.
		The gun comprises a cathode (K) to be connected to the body (C), at least one accelerating electrode (E), an accelerating voltage generator (G) and a generator (R) for heating the cathode.
		The invention thus is a particular manner of using an electron gun to determine the potential of a body, with reference henceforth, on a non-limiting basis, to a space vehicle.
	www.freepatentsonline.com /5321336.html (2573 words)

	[No title] (Site not responding. Last check: 2007-11-03)
		The electron gun in a scanning electron microscope is the source for the electron beam used to probe the sample.
		Electrons are emitted from a cathode, accelerated by passage through electrical fields and focussed to a first optical image of the source.
		This beam of electrons will be focussed by the shape of the field gradient to a cross-over just before the anode, forming the first optical image of the source and ensuring that a larger percentage of the electrons will pass through the aperture of the anode.
	www.sem.com /analytic/sem.htm (4648 words)

	E-Gun
		However, in the pulsed-grid configuration, electrons emitted from the cathode are held on the cathode by applying a negative bias of sufficient voltage on the grid (Electrons flow from negative to positive).
		The gun is housed in the ceramic column, or reentrant as it is sometimes called, heater leads and a coax cable run from the gun to the High Voltage deck.
		The match to the gun is not perfect causing the first pulse in the bunch to be lower in amplitude, this is not a problem for operations and no effort has been made to improve the match.
	www.nsls.bnl.gov /organization/OpsEng/ElectricalSys/PowerSys/e-gun.htm (811 words)

	CPC Sample Unit (Site not responding. Last check: 2007-11-03)
		Secondary electron intensity is a function of the surface orientation with respect to the beam and the SE detector and thus produces an image of the specimen morphology.
		Electron energy loss spectroscopy is a transmission electron technique, since multiple energy loss interactions occur for a single beam electron in the bulk samples characteristic of SEM and deconvolution of these energy losses is not possible.
		The emitted electrons are accelerated to high energy by the application of a negative voltage to the cathode and a bias voltage to the grid cap with the anode grounded.
	www.wiley.com /cp/mmr/mmrsampl.htm (9024 words)

	Accelerator: Electron Gun
		gun, which produces the electrons to be accelerated.
		In the polarized electron gun, polarized laser light knocks electrons off the surface of a semiconductor and an electric field accelerates them toward the end of the accelerator pipe.
		The polarized electron gun is kept at an even lower level of vacuum than the accelerator, down to 10
	www2.slac.stanford.edu /vvc/accelerators/electrongun.html (130 words)

	Electron gun system with dynamic focus and dynamic convergence - Patent 4701678
		Neck 76 is shown as enclosing an electron gun 78 which is indicated as projecting three electron beams 80R, 80G, and 80B on to the inner surface of faceplate 70, comprising the screen 82.
		The gun system 94 comprises an electron gun 96, and means 98 for developing and applying to the plurality of electrode means a pattern of electrical potentials which form field components in the gaps therebetween.
		Electron guns having the extended field main focus lens, and their principles of operation, are fully described and claimed in U.S. Pat.
	www.freepatentsonline.com /4701678.html (8689 words)

	Medcyclopaedia - Electron gun
		The electron gun is an essential part of the television camera and the television monitor and consists of a cathode with a heating coil and a control grid.
		Heating liberates electrons from the cathode by thermionic emission, and the electron cloud is formed into a beam by the control grid which also initiates the acceleration of the electron beam through the vacuum tube (towards the target of the television camera or the fluorescent screen of the television monitor).
		The term electron gun is also used for the source of the electron beam in cine CT scanners.
	www.medcyclopaedia.com /library/topics/volume_i/e/ELECTRON_GUN.aspx (172 words)

	Electron Gun (Site not responding. Last check: 2007-11-03)
		An electron gun is used to produce a stream of electrons with a well defined kinetic energy.
		There are two parts to an electron gun; 1) a heated filament, and 2) the accelerating region, which is bounded by two electrodes, known as the cathode and the anode.
		Electrons leave the surface of the filament by a process known as thermionic emission, but with very little energy.
	physics.csustan.edu /java/tutorials/EM/ElectronGun/ElectronGun.htm (314 words)

	Electron Microscopy: The Electron Gun (Site not responding. Last check: 2007-11-03)
		The electron microscope generates images by bombarding a sample with electrons and then transforming the results of that interaction into a viewable image.
		The FEG gun is not a thermal filament.
		Because the emitted electrons in the various types of guns are heated, their energy distribution is not a sharp peak.
	cryoem.berkeley.edu /~nieder/em_for_dummies/gun.html (327 words)

	Tracing an image with electrons
		Like a rapid-fire BB gun, it scans electrons across the target which reflect onto a fluorescent screen where the image is captured by a camera and enlarged.
		Electrons are much smaller than atoms, so a scanning electron microscope paints a razor-sharp image of the target.
		This means the electron gun and column where the electron beam is created and focused is at high or "hard" vacuum.
	science.nasa.gov /newhome/headlines/ast05mar98_3.htm (745 words)

	Electron Gun
		The electron source is mounted in a triode configuration which produces an accelerated electron beam from the small diameter, high brightness LaB6 emitter.
		The electron beam passes through an electrostatic alignment stage which compensates for any slight misalignment of the electron source with respect to the electron optical axis of the system.
		Four electrostatic deflector plates are mounted just after the objective lens to scan the electron beam across the sample in a rectangular raster, as in a TV display.
	bama.ua.edu /~surfspec/egun.htm (170 words)

	electron gun -- Encyclopædia Britannica (Site not responding. Last check: 2007-11-03)
		The source of the electron beam is the cathode, a flat metal support covered with oxides of barium and strontium.
		The transmission electron microscope has three essential systems: (1) an electron gun, which produces the electron beam, and the condenser system, which focuses the beam onto the object, (2) the image-producing system, consisting of the objective lens, movable specimen stage, and intermediate and projector lenses, which focus the electrons passing through the specimen to...
		The transmission electron microscope is used to observe thin slices of a specimen.
	www.britannica.com /eb/article-9032322 (970 words)

	On Target (October 1999) - Installation of second polarized electron gun boosts physics program
		Likewise, JLab's recent installation of a second polarized electron gun is designed to resolve one of physics researchers' most important issues: uninterrupted beam delivery.
		A key component of both electron guns is a small disc of material that sits within each injector's ultra-high-vacuum chamber.
		The presence of two polarized guns enables one to be taken out of operation as necessary, while the other continues to supply beam.
	www.jlab.org /news/news_letter/news_oct99/machine.html (878 words)

	NIST - EBIT Electron gun (Site not responding. Last check: 2007-11-03)
		The Electron Gun generates an intense beam of electrons which travels along the axis of the EBIT and strips electrons from atoms which lie in its path, thereby forming highly charged ions.
		In the NIST EBIT, the electron gun is mounted on a small high-voltage platform so that in the future our EBIT can be made to operate at even higher electron beam energies.
		The electron gun is of a Pierce design and contains a cathode with a heated tungsten element infused with barium oxide to reduce the work function.
	physics.nist.gov /MajResFac/EBIT/e-gun.html (123 words)

	electron gun - Hutchinson encyclopedia article about electron gun
		Series of electrodes, including a cathode for producing an electron beam.
		It plays an essential role in many electronic devices, including cathode-ray tubes (television tubes) and electron microscopes.
		This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.
	encyclopedia.farlex.com /electron+gun (89 words)

	Electron Interference
		Using our two slits from before, we're going to use an "electron gun" which shoots a steady stream of electrons, the same particles that orbit atoms, at a sensitive screen...
		Maybe the electron gun doesn't work like a machine gun, and it shoots a bunch of electrons at once.
		Maybe we could turn down the electron gun until the electrons were coming out slowly enough for us to be sure it was one at a time.
	www.colorado.edu /physics/2000/schroedinger/two-slit3.html (395 words)

	Howstuffworks "How does the electron gun inside a TV work, and why is it called an "electron gun"?"
		It heats a cathode, which emits a cloud of electrons.
		When the electrons leave the accelerating anode, they are traveling at a reasonable fraction of the speed of light, and this gives them a lot of energy.
		A fl-and-white TV has a single electron gun, while a color TV needs three guns because each pixel on the screen is made of a red, a green and a blue dot.
	www.howstuffworks.com /question694.htm (381 words)

	Kimball Physics Electron Gun (Electron Source) Product Guide
		Kimball Physics Electron Guns are designed for use in a wide variety of ultra high vacuum (UHV) surface physics, space physics, and processing applications.
		Electron gun and power supply prices vary with the system configuration and options; please call or email Kimball Physics for a quotation.
		Power Supplies included with Electron Gun Systems supply all voltages to drive a given electron gun: High voltage, Source, Grid, Focus, etc. A new generation of compact power supplies, is being developed for all standard units.
	www.kimphys.com /electron_guns/egun_prod.htm (573 words)

	Science Museum - The electron and its properties (Site not responding. Last check: 2007-11-03)
		When the electron is shot out of the muzzle of an electron gun it emerges with a particular velocity and travels along a well defined trajectory.
		All the known properties of the electron are consistent with the assumption that its radius is zero.
		The electron orbits the nucleus; in the case of hydrogen the nucleus is a single proton.
	www.sciencemuseum.org.uk /on-line/electron/section1/properties.asp (343 words)

	Thermo Electron Corporation --LEG 41 Electron Gun - for charge neutralisation
		The gun consists of an electron source, optical column, and deflection poles mounted inside a stainless steel tube.
		The electron source is a Thoria coated Rhenium tape filament with the emission (beam current) controlled by a variable potential grid in front of the filament.
		A1 and A3 are at + 500eV, the deflection poles are centred at 500eV.
	www.thermo.com /com/cda/product/detail/0,1055,15934,00.html (351 words)

	Gun control -- Britannica Student Encyclopedia
		Most machine guns are belt-fed weapons that fire from 500 to 1,000 rounds per minute and will continue to fire as long as the trigger is held back or until the supply of ammunition is exhausted.
		The machine gun was developed in the late 19th century and has profoundly altered the character of...
		With the appearance of the machine gun in the late 19th century, it became possible to fire belts of small arms...
	www.britannica.com /ebi/article-9311545 (959 words)

	THE ELECTRON GUN
		gun provides an electron beam, which is a highly concentrated stream of electrons.
		The ELECTRON GUN is roughly equivalent to the cathodes of conventional tubes.
		In the electron tubes that you have studied, the cathode was cylindrical and
	www.tpub.com /content/neets/14178/css/14178_87.htm (437 words)

	Modular Low-Heater-Power Cathode/Electron Gun Assembly for TWT's
		A particularly important TWT application is in the microwave power module (a hybrid microwave/millimeter wave amplifier consisting of a low-noise solid-state driver, a small TWT, and an electronic power conditioner integrated into a single compact package), where electrical efficiency and thermal loading are critical factors and lower cost is needed for successful commercialization.
		The modular cathode/electron gun assembly consists of four subassemblies—the cathode, the focus electrode, the header (including the electrical feedthroughs), and the gun envelope (including the anode)—a diagram of which is shown in the figure.
		The modular cathode/electron gun assembly was computer modeled to replicate the performance of the original electron gun and fabricated largely from existing CRT parts.
	www.grc.nasa.gov /WWW/RT1999/5000/5620wintucky.html (616 words)

	[No title]
		The emitted electrons are then accelerated towards the electron window and form a very wide electron beam.
		The main advantage of this SET electron gun over the conventional design is that it avoids the interaction between the WIPS and the electron beam.
		Since the ion beam controls the intensity and time response of the emerging electron beam, the gun is suitable for a continuous and high repetition rate operation.
	www.hotta.es.titech.ac.jp /WIPS/main-e.html (341 words)

	Simulation on the Thermionic Electron Gun
		The filament current controls the temperature of the filament and hence the number of electrons emitted or 'beam current'.
		The bias potential controls the size of the region of filament which emits electrons and hence it affects both the source size and the beam current.
		The main reason to alter bias is to change the brightness of the beam.
	www.matter.org.uk /tem/electron_gun/electron_gun_simulation.htm (223 words)

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