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How an electron gun works
How an electron gun works
Published: 2017/03/09
Channel: Eric Dalgetty
Electron Gun - Backstage Science
Electron Gun - Backstage Science
Published: 2011/03/29
Channel: BackstageScience
DIY Electron Gun
DIY Electron Gun
Published: 2012/01/02
Channel: Kramnik Daniel
Part 1: Electron Guns - G. Jensen
Part 1: Electron Guns - G. Jensen
Published: 2015/02/05
Channel: caltech
DIY Scanning Electron Microscope - Electron Gun Detail
DIY Scanning Electron Microscope - Electron Gun Detail
Published: 2011/04/17
Channel: Applied Science
DIY Electron Accelerator - Cathode Ray Tube
DIY Electron Accelerator - Cathode Ray Tube
Published: 2015/04/19
Channel: Gooferking Science
Electron Generation~Vacuum Tubes and Electron Guns.
Electron Generation~Vacuum Tubes and Electron Guns.
Published: 2016/12/05
Channel: Bennett's lab
CRT
CRT's Electron Gun Boils Water
Published: 2013/05/28
Channel: InductiveExperiments
Homemade Lenard Tube (Ion / Electron Gun)
Homemade Lenard Tube (Ion / Electron Gun)
Published: 2010/05/30
Channel: clagwell
DIY Particle Accelerator 3
DIY Particle Accelerator 3
Published: 2011/07/14
Channel: quicknuclearscience
Electron Gun -- Electro/House -- Royalty Free Music
Electron Gun -- Electro/House -- Royalty Free Music
Published: 2016/10/05
Channel: TeknoAXE's Royalty Free Music
DIY Particle Accelerator 2
DIY Particle Accelerator 2
Published: 2011/07/13
Channel: quicknuclearscience
Akira Ifukube - The Electron Gun
Akira Ifukube - The Electron Gun
Published: 2010/12/31
Channel: wesgriff1
Indian KALI electron gun superior than US LaWS Laser Gun
Indian KALI electron gun superior than US LaWS Laser Gun
Published: 2016/04/03
Channel: Logical Hindu
How Stuff works! CRT Cathode Ray Tubes (Televisions) FOCUSED ELECTRON BEAM!
How Stuff works! CRT Cathode Ray Tubes (Televisions) FOCUSED ELECTRON BEAM!
Published: 2012/06/12
Channel: TheOriginal FatDonkey
Electron beam control in a scanning electron microscope
Electron beam control in a scanning electron microscope
Published: 2014/04/10
Channel: Applied Science
How does the electron gun work?  Thermionic Emission and Particle Acceleration - A Level Physics
How does the electron gun work? Thermionic Emission and Particle Acceleration - A Level Physics
Published: 2017/09/10
Channel: GorillaPhysics
When KALI Electron gun burnt 140 PAK Soldiers - operation "Whitewash"
When KALI Electron gun burnt 140 PAK Soldiers - operation "Whitewash"
Published: 2016/04/09
Channel: Logical Hindu
M.E.G.A: Mini Electron Gun Accelerator
M.E.G.A: Mini Electron Gun Accelerator
Published: 2012/04/10
Channel: TappWaterProductions
KALI Electron Gun | Know Everything About KALI System India | Hindi Latest
KALI Electron Gun | Know Everything About KALI System India | Hindi Latest
Published: 2017/09/01
Channel: RL Decode
Trinitron CRT Electron Gun Assembly Up Close (re-upload)
Trinitron CRT Electron Gun Assembly Up Close (re-upload)
Published: 2015/08/16
Channel: CAL'S ENGINEERING
The CRT Electron Gun (Dell E770 CRT Monitor)
The CRT Electron Gun (Dell E770 CRT Monitor)
Published: 2013/10/09
Channel: TheCRTman
Commercial Electron-beam 3D Metal Printing System Unveiled In Xi
Commercial Electron-beam 3D Metal Printing System Unveiled In Xi'an City
Published: 2017/03/29
Channel: CCTV+
Physical Science : How Does a Cathode Ray Tube Work?
Physical Science : How Does a Cathode Ray Tube Work?
Published: 2008/12/06
Channel: eHow
Electron Gun
Electron Gun
Published: 2012/04/18
Channel: MrClientvideo
Electron gun fireworks
Electron gun fireworks
Published: 2016/05/02
Channel: Simon Spiers
Electron Gun Demo
Electron Gun Demo
Published: 2013/11/19
Channel: Martin Simon
Electron Beam Gun Evaporation Animation
Electron Beam Gun Evaporation Animation
Published: 2014/04/28
Channel: jahanbakhsh mashaiekhy
Cathode Ray Tube
Cathode Ray Tube
Published: 2010/05/05
Channel: TutorVista
Electron Gun
Electron Gun
Published: 2016/10/31
Channel: Various Artists - Topic
Electron Gun is Designed for Superconducting Accelerators
Electron Gun is Designed for Superconducting Accelerators
Published: 2012/03/21
Channel: Laboratory Equipment
DL#123 - SEM Teardown Part 2: Electron Gun & Column
DL#123 - SEM Teardown Part 2: Electron Gun & Column
Published: 2017/06/05
Channel: DextersLab2013
electron gun DIY
electron gun DIY
Published: 2017/07/23
Channel: John Smedley
electron gun
electron gun
Published: 2016/11/29
Channel: Ben O'Donovan
Electron Gun
Electron Gun
Published: 2016/04/08
Channel: Electrostatic - Topic
Thermionic Emission | Electronics
Thermionic Emission | Electronics
Published: 2014/07/08
Channel: myhometuition
Physics Homework Help - Electron Gun problem
Physics Homework Help - Electron Gun problem
Published: 2017/04/01
Channel: memetic distortion
DIY Electron Gun Magnetic Deflection
DIY Electron Gun Magnetic Deflection
Published: 2011/08/25
Channel: Hyun Lee
541 - Cathode-ray tube of oscilloscope.
541 - Cathode-ray tube of oscilloscope.
Published: 2013/05/28
Channel: Alexander C
Electrostatic - Electron Gun
Electrostatic - Electron Gun
Published: 2009/07/13
Channel: Eric McRae
Electrostatic - Electron Gun (Live At The Whisky A Go Go)
Electrostatic - Electron Gun (Live At The Whisky A Go Go)
Published: 2011/04/19
Channel: electrostatic
Electron Gun Warm Up
Electron Gun Warm Up
Published: 2017/02/21
Channel: Scott Horton
Troodon Pack VS Electron Gun! — Primal Prey | Part 9
Troodon Pack VS Electron Gun! — Primal Prey | Part 9
Published: 2017/09/08
Channel: Saurian Target
CRT Electron gun pop & Vintage Philco Chassis
CRT Electron gun pop & Vintage Philco Chassis
Published: 2010/11/18
Channel: HDXFH
Cathode ray tube (Electron Accelerator)
Cathode ray tube (Electron Accelerator)
Published: 2015/11/07
Channel: FACT F F
Electron Gun Equation and Electric Field Strength
Electron Gun Equation and Electric Field Strength
Published: 2013/01/24
Channel: SUASPhysics
Scanning Electron Microscopy (SEM): animation of 3 types of imaging
Scanning Electron Microscopy (SEM): animation of 3 types of imaging
Published: 2015/10/22
Channel: NUS Chem Emelyn Tan
Electron gun
Electron gun
Published: 2013/11/26
Channel: Roland Hablutzel
Review of the super electron gun
Review of the super electron gun
Published: 2015/07/03
Channel: Lucas Overbaugh
X-Ray Production : What Produces X-Rays?
X-Ray Production : What Produces X-Rays?
Published: 2009/01/27
Channel: eHow
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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Electron gun from a cathode ray tube
Electron gun from an oscilloscope CRT

An electron gun (also called electron emitter) is an electrical component in some vacuum tubes that produces a narrow, collimated electron beam that has a precise kinetic energy. The largest use is in cathode ray tubes (CRTs), used in nearly all television sets, computer displays and oscilloscopes that are not flat-panel displays. They are also used in field emission displays (FEDs), which are essentially flat-panel displays made out of rows of extremely small cathode ray tubes. They are also used in microwave linear beam vacuum tubes such as klystrons, inductive output tubes, travelling wave tubes, and gyrotrons, as well as in scientific instruments such as electron microscopes and particle accelerators. Electron guns may be classified by the type of electric field generation (DC or RF), by emission mechanism (thermionic, photocathode, cold emission, plasmas source), by focusing (pure electrostatic or with magnetic fields), or by the number of electrodes.

Characteristics[edit]

Setup of an electron gun with:
Hot cathode
Wehnelt cylinder
➂ Anode
Electron gun from a travelling wave tube, cutaway through axis to show construction

A direct current, electrostatic thermionic electron gun is formed from several parts: a hot cathode, which is heated to create a stream of electrons via thermionic emission, electrodes generating an electric field which focus the beam (such as a Wehnelt cylinder), and one or more anode electrodes which accelerate and further focus the electrons. A large voltage between the cathode and anode accelerates the electrons. A repulsive ring placed between them focuses the electrons onto a small spot on the anode at the expense of a lower extraction field strength on the cathode surface. Often at this spot is a hole so that the electrons that pass through the anode form a collimated beam and finally reach a second anode called a collector. This arrangement is similar to an Einzel lens.

Most color cathode ray tubes – such as those used in color televisions – incorporate three electron guns, each one producing a different stream of electrons. Each stream travels through a shadow mask where the electrons will impinge upon either a red, green or blue phosphor to light up a color pixel on the screen. The resultant color that is seen by the viewer will be a combination of these three primary colors.

Applications[edit]

The most common use of electron guns is in cathode ray tubes, which were widely used in computer and television monitors. An electron gun can also be used to ionize particles by adding or removing electrons from an atom. This technology is sometimes used in mass spectrometry in a process called electron ionization to ionize vaporized or gaseous particles. More powerful electron guns are used for welding, metal coating, 3D metal printers, metal powder production and vacuum furnaces.

Measurement and detection[edit]

A nanocoulombmeter in combination with a Faraday cup can be used to detect and measure the beams emitted from electron gun and ion guns.

Another way to detect electron beams from an electron gun is by using a phosphor screen which will glow when struck by an electron.

See also[edit]

External links[edit]

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