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electrodes which accelerate and further focus the beam. A large voltage difference between the cathode and anode accelerates the electrons away from the cathode. A repulsive ring placed between the electrodes focuses the electrons onto a small spot on the anode, at the expense of a lower extraction
379:, which were widely used in computer and television monitors before the advent of flat screen displays. Most color cathode-ray tubes incorporate three electron guns, each one producing a different stream of electrons. Each stream travels through a
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field strength on the cathode surface. There is often a hole through the anode at this small spot, through which the electrons pass to form a collimated beam before reaching a second anode, called the collector. This arrangement is similar to an
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540:, pp. 158-175, in A. W. Chao, H.O. Moser and Z. Zhao, Editors, "Accelerator Physics and Technology Applications" World Scientific, Singapore, 2004
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199:, which are essentially flat-panel displays made out of rows of extremely small cathode-ray tubes. They are also used in microwave linear beam
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Electron guns may be classified by the type of electric field generation (DC or RF), by emission mechanism (
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using a linac (linear accelerator); a high energy electron beam hits a target, stimulating emission of
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on the screen. The resultant color that is seen by the viewer will be a combination of these three
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source), by focusing (pure electrostatic or with magnetic fields), or by the number of electrodes.
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Copeland, Jack; Haeff, Andre A. (September 2015). "The True
History of the Traveling Wave Tube".
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A photoinjector based on a "one and a half cells" microwave cavity at a frequency of 2856 MHz.
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A direct current, electrostatic thermionic electron gun is formed from several parts: a
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particles. More powerful electron guns are used for welding, metal coating,
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can be used to detect and measure the beams emitted from electron gun and
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Another way to detect electron beams from an electron gun is by using a
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particles by adding electrons to, or removing electrons from an
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Electron guns are also used in medical applications to produce
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is used. An RF electron gun with a photocathode is called a
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Electrical component producing a narrow electron beam
490:screen which will glow when struck by an electron.
49:. Unsourced material may be challenged and removed.
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433:, metal powder production and vacuum furnaces.
383:where the electrons will impinge upon either a
219:, as well as in scientific instruments such as
1032:Serial block-face scanning electron microscopy
735:Detectors for transmission electron microscopy
596:Introduction to Electron Guns for Accelerators
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549:
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345:Photoinjectors play a leading role in X-ray
467:, cutaway through axis to show construction
375:The most common use of electron guns is in
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318:, either single cell or multi-cell, and a
109:Learn how and when to remove this message
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363:
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286:, which is heated to create a stream of
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413:. This technology is sometimes used in
368:Schottky-emitter electron source of an
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451:amplifiers for microwave frequencies.
298:to focus the electron beam (such as a
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157:) is an electrical component in some
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591:Interactive tutorial from LMU Munich
47:adding citations to reliable sources
18:
523:H.G. Kirk, R. Miller, D. Yeremian,
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13:
14:
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668:Timeline of microscope technology
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314:An RF electron gun consists of a
195:. Electron guns are also used in
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23:
1027:Precession electron diffraction
525:Electron guns and pre-injectors
447:Electron guns are also used in
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322:. In order to obtain a smaller
34:needs additional citations for
530:
197:field-emission displays (FEDs)
1:
589:Simulation of an Electron Gun
510:
270:Setup of an electron gun. 1.
7:
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326:at a given beam current, a
294:; electrodes generating an
10:
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1012:Immune electron microscopy
930:Annular dark-field imaging
745:Everhart–Thornley detector
564:10.1109/MSPEC.2015.7226611
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455:Measurement and detection
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136:The electron gun from an
1191:Thermo Fisher Scientific
1017:Geometric phase analysis
905:Aberration-Corrected TEM
505:Electron-beam technology
405:gun can also be used to
161:that produces a narrow,
940:Charge contrast imaging
750:Field electron emission
191:, before the advent of
1130:Thomas Eugene Everhart
475:in combination with a
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372:
342:
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209:inductive output tubes
179:(CRTs), used in older
175:The largest use is in
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1309:Microscope components
1135:Vernon Ellis Cosslett
955:Dark-field microscopy
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258:Electron gun from an
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225:particle accelerators
213:travelling wave tubes
135:
124:
1140:Vladimir K. Zworykin
790:Correlative light EM
699:Electron diffraction
465:travelling wave tube
463:Electron gun from a
449:travelling wave tube
417:in a process called
390:to light up a color
347:Free-electron lasers
221:electron microscopes
125:Electron gun from a
43:improve this article
1304:Accelerator physics
1105:Manfred von Ardenne
1090:Gerasimos Danilatos
997:Electron tomography
992:Electron holography
935:Cathodoluminescence
714:Secondary electrons
704:Electron scattering
648:Electron microscopy
634:Electron microscopy
419:electron ionization
370:Electron microscope
354:accelerator physics
302:); and one or more
292:thermionic emission
193:flat-panel displays
168:that has a precise
1227:Digital Micrograph
833:Environmental SEM
755:Field emission gun
719:X-ray fluorescence
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385:red, green or blue
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1120:Nestor J. Zaluzec
1115:Maximilian Haider
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431:3D metal printers
415:mass spectrometry
377:cathode-ray tubes
185:computer displays
177:cathode-ray tubes
144:video camera tube
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473:nanocoulombmeter
316:Microwave cavity
300:Wehnelt cylinder
276:Wehnelt cylinder
155:electron emitter
127:cathode-ray tube
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728:Instrumentation
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583:External links
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538:photoinjectors
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396:primary colors
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351:beam emittance
324:beam emittance
296:electric field
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170:kinetic energy
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58:"Electron gun"
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810:Low-energy EM
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709:Kikuchi lines
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552:IEEE Spectrum
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536:I. Ben-Zvi,
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332:photoinjector
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240:cold emission
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189:oscilloscopes
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166:electron beam
164:
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153:(also called
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60: –
59:
55:
54:Find sources:
48:
44:
38:
37:
32:This article
30:
26:
21:
20:
1314:Vacuum tubes
1275:
1263:
1217:EM Data Bank
1181:Nion Company
1075:Dennis Gabor
1065:Albert Crewe
843:Confocal SEM
740:Electron gun
739:
689:Auger effect
595:
558:(9): 38–43.
555:
551:
545:
537:
532:
524:
519:
485:
470:
446:
435:
400:
374:
360:Applications
356:facilities.
344:
328:photocathode
313:
281:
260:oscilloscope
236:photocathode
229:
201:vacuum tubes
174:
159:vacuum tubes
154:
151:electron gun
150:
148:
105:
96:
86:
79:
72:
65:
53:
41:Please help
36:verification
33:
1161:FEI Company
1095:Harald Rose
1085:Ernst Ruska
774:Microscopes
682:with matter
680:interaction
598:Dunham 2008
477:Faraday cup
381:shadow mask
309:Einzel lens
284:hot cathode
272:Hot cathode
1293:Categories
1242:Multislice
1058:Developers
918:Techniques
663:Microscope
658:Micrograph
511:References
421:to ionize
349:and small
278:. 3. Anode
232:thermionic
163:collimated
99:March 2020
69:newspapers
1110:Max Knoll
765:Stigmator
423:vaporized
288:electrons
217:gyrotrons
205:klystrons
1265:Category
1212:CrysTBox
1200:Software
871:Cryo-TEM
678:Electron
572:36963575
494:See also
488:phosphor
481:ion guns
403:electron
388:phosphor
203:such as
1277:Commons
925:4D STEM
898:4D STEM
876:Cryo-ET
848:SEM-XRF
838:CryoSEM
795:Cryo-EM
653:History
427:gaseous
320:cathode
244:plasmas
141:Vidicon
83:scholar
1222:EMsoft
1207:CASINO
1186:TESCAN
1051:Others
950:cryoEM
641:Basics
570:
500:Optics
442:X-rays
438:X-rays
407:ionize
250:Design
215:, and
85:
78:
71:
64:
56:
1176:Leica
1022:PINEM
888:HRTEM
883:EFTEM
568:S2CID
392:pixel
304:anode
274:. 2.
90:JSTOR
76:books
1237:IUCr
1171:JEOL
1042:WBDF
1037:WDXS
987:EBIC
982:EELS
977:ECCI
965:EBSD
945:CBED
893:STEM
411:atom
290:via
223:and
187:and
62:news
1007:FEM
1002:FIB
970:TKD
960:EDS
863:TEM
825:SEM
800:EMP
560:doi
425:or
401:An
334:.
262:CRT
234:,
149:An
138:RCA
45:by
1295::
782:EM
566:.
556:52
554:.
483:.
471:A
444:.
398:.
311:.
242:,
238:,
227:.
211:,
207:,
183:,
172:.
626:e
619:t
612:v
574:.
562::
112:)
106:(
101:)
97:(
87:·
80:·
73:·
66:·
39:.
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