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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
Part 1: Electron Guns - G. Jensen
Part 1: Electron Guns - G. Jensen
Published: 2015/02/05
Channel: caltech
Electron Generation~Vacuum Tubes and Electron Guns.
Electron Generation~Vacuum Tubes and Electron Guns.
Published: 2016/12/05
Channel: Bennett's lab
DIY Electron Gun
DIY Electron Gun
Published: 2012/01/02
Channel: Kramnik Daniel
DIY Electron Accelerator - Cathode Ray Tube
DIY Electron Accelerator - Cathode Ray Tube
Published: 2015/04/19
Channel: Gooferking Science
DIY Scanning Electron Microscope - Electron Gun Detail
DIY Scanning Electron Microscope - Electron Gun Detail
Published: 2011/04/17
Channel: Applied Science
Thermionic Emission | Electronics
Thermionic Emission | Electronics
Published: 2014/07/08
Channel: myhometuition
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 - GCSE and A Level Physics Revision
Cathode Ray Tube
Cathode Ray Tube
Published: 2010/05/05
Channel: TutorVista
DIY Particle Accelerator 3
DIY Particle Accelerator 3
Published: 2011/07/14
Channel: quicknuclearscience
541 - Cathode-ray tube of oscilloscope.
541 - Cathode-ray tube of oscilloscope.
Published: 2013/05/28
Channel: Alexander C
Electron Gun
Electron Gun
Published: 2012/04/18
Channel: MrClientvideo
electron gun
electron gun
Published: 2016/11/29
Channel: Ben O'Donovan
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
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
apniPhysics|What is Electron Gun in Cathode Ray Tube ?
apniPhysics|What is Electron Gun in Cathode Ray Tube ?
Published: 2017/12/25
Channel: Dr Sushil Kumar Guruji
Electron Gun Demonstration
Electron Gun Demonstration
Published: 2016/03/05
Channel: Eric Dalgetty
Physical Science : How Does a Cathode Ray Tube Work?
Physical Science : How Does a Cathode Ray Tube Work?
Published: 2008/12/06
Channel: eHow
Nanomaterials Up Close: Nanoengineered electron guns
Nanomaterials Up Close: Nanoengineered electron guns
Published: 2014/06/19
Channel: Cambridge University
Electron Gun -- Electro/House -- Royalty Free Music
Electron Gun -- Electro/House -- Royalty Free Music
Published: 2016/10/05
Channel: TeknoAXE's Royalty Free Music
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
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
DIY Particle Accelerator 2
DIY Particle Accelerator 2
Published: 2011/07/13
Channel: quicknuclearscience
DL#123 - SEM Teardown Part 2: Electron Gun & Column
DL#123 - SEM Teardown Part 2: Electron Gun & Column
Published: 2017/06/05
Channel: DextersLab2013
Cathode Ray Tube: How It Works 1943 US Navy Training Film
Cathode Ray Tube: How It Works 1943 US Navy Training Film
Published: 2015/04/14
Channel: Jeff Quitney
DIY Electron Gun Magnetic Deflection
DIY Electron Gun Magnetic Deflection
Published: 2011/08/25
Channel: Hyun Lee
Electron gun fireworks
Electron gun fireworks
Published: 2016/05/02
Channel: Simon Spiers
Synchrotron electron gun and linear accelerator
Synchrotron electron gun and linear accelerator
Published: 2014/12/09
Channel: ConversationEDU
Electron Gun Products
Electron Gun Products
Published: 2012/05/08
Channel: MrClientvideo
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
The CRT Electron Gun (Dell E770 CRT Monitor)
The CRT Electron Gun (Dell E770 CRT Monitor)
Published: 2013/10/09
Channel: TheCRTman
Argame 3010 For Android and IOS First Look!
Argame 3010 For Android and IOS First Look!
Published: 2017/12/30
Channel: VideoWaliSarkar
Electron gun Meaning
Electron gun Meaning
Published: 2015/05/02
Channel: ADictionary
electron gun stdp /cañon de electrones stdp
electron gun stdp /cañon de electrones stdp
Published: 2010/02/06
Channel: aleksei13r
electron gun DIY
electron gun DIY
Published: 2017/07/23
Channel: John Smedley
Physics Homework Help - Electron Gun problem
Physics Homework Help - Electron Gun problem
Published: 2017/04/01
Channel: memetic distortion
Electron Gun Equation and Electric Field Strength
Electron Gun Equation and Electric Field Strength
Published: 2013/01/24
Channel: SUASPhysics
M.E.G.A: Mini Electron Gun Accelerator
M.E.G.A: Mini Electron Gun Accelerator
Published: 2012/04/10
Channel: TappWaterProductions
Akira Ifukube - The Electron Gun
Akira Ifukube - The Electron Gun
Published: 2010/12/31
Channel: wesgriff1
Understanding Electrical Field and Using Electron Gun to See Its Path
Understanding Electrical Field and Using Electron Gun to See Its Path
Published: 2012/11/04
Channel: fauzan ahdan
MAX IV Laboratory  RF 3GHz Thermionic Gun in COMSOL Multiphysics
MAX IV Laboratory RF 3GHz Thermionic Gun in COMSOL Multiphysics
Published: 2016/03/08
Channel: EE.
What Does The Electron Gun Do?
What Does The Electron Gun Do?
Published: 2017/12/13
Channel: Marcus Cruz
Microwaved Electron Gun
Microwaved Electron Gun
Published: 2012/03/17
Channel: bluesmokeproductions
Electron Gun
Electron Gun
Published: 2015/03/26
Channel: David Bennett
this will happen if you break electron gun
this will happen if you break electron gun
Published: 2016/08/06
Channel: Gio No
CRT Electron gun pop & Vintage Philco Chassis
CRT Electron gun pop & Vintage Philco Chassis
Published: 2010/11/18
Channel: HDXFH
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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.

Electron guns are also used in medical linac, where high energy electron beam, hit a target and emit X-ray.

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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