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electron guns

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Image
Published: 01 January 1986
Fig. 2 Conventional tungsten hairpin filament electron gun. More
Image
Published: 15 December 2019
Fig. 8 Summary of configurations of an electron gun and lenses in transmission electron microscopy. CCD, charge-coupled device More
Image
Published: 01 August 2013
Fig. 17 Electron beam components for evaporation process. (a) Linear focusing gun. (b) Bent-beam electron gun with a water-cooled evaporant support More
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001770
EISBN: 978-1-62708-178-8
... Abstract This article describes the principles and applications of Auger electron spectroscopy (AES). It provides information on the instrumentation typically used in the AES, including an electron gun, an electron spectrometer, a secondary electron detector, and an ion gun. The article also...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003755
EISBN: 978-1-62708-177-1
... Abstract This article outlines the beam/sample interactions and the basic instrumental design of a scanning electron microscopy (SEM), which include the electron gun, probeforming column (consisting of magnetic electron lenses, apertures, and scanning coils), electron detectors, and vacuum...
Image
Published: 01 January 1994
Fig. 8(a) Focused electron-beam sources used for evaporation processing. Bent-beam electron gun (top); long-focus gun (bottom) More
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Published: 01 January 1989
Fig. 1 Electron beam gun More
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Published: 01 December 2008
Fig. 6 Four-gun 1200 kW combined electron beam drip melting and cold hearth melting furnace More
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Published: 31 October 2011
Fig. 4 Internal, movable gun configuration in a low-voltage, high-vacuum electron beam (EB) welding system with a boom manipulator. The photograph shows different motion configurations. Courtesy of Sciaky, Inc. More
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Published: 31 October 2011
Fig. 6 Large-chamber, low-voltage electron beam welding system with movable gun. Courtesy of Sciaky, Inc. More
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Published: 31 October 2011
Fig. 7 Large-chamber, high-voltage electron beam welding system with fixed gun. Courtesy of PTR-Precision Technologies, Inc., Enfield, CT More
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Published: 31 October 2011
Fig. 20 Moveable electron beam welding gun assembly with wire-feed system. Courtesy of Sciaky, Inc. More
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Published: 15 December 2019
Fig. 6 Schematic diagram of a thermionic gun source for transmission electron microscopy More
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Published: 15 December 2019
Fig. 7 Schematic diagram of a field-emission gun source for transmission electron microscopy More
Book Chapter

Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001369
EISBN: 978-1-62708-173-3
.... Fig. 1 Weld generated by an electron beam operating in an enclosed chamber maintained at a pressure of approximately 3 Pa (2 × 10 −2 torr) Basically, the electron beam is formed (under high-vacuum conditions) by employing a triodestyle electron gun consisting of a cathode, a heated source...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005615
EISBN: 978-1-62708-174-0
... of an electron beam operating in an enclosed chamber maintained at a pressure of approximately 13 mPa (1 × 10 −4 torr) The electron beam is most often formed by a triode-style electron gun under high vacuum conditions, and a schematic of this is shown in Fig. 2 . The triode assembly consists...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006769
EISBN: 978-1-62708-295-2
... electrons from a tungsten filament are termed cold-field-emission SEMs, or high-resolution SEMs, and have the highest resolution capabilities of all SEMs. A compromise is reached in the thermal-field-emission (or Schottky gun) SEM when a combination of heat and electric field are used to produce an electron...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005204
EISBN: 978-1-62708-187-0
... remelting, for example, is avoided. Power losses of the electron beam inside the gun and between the gun nozzle and the target are very small, but losses up to 40% of the beam power can be incurred because of beam reflection, radiation of the liquid metal, and heat conductivity of the water-cooled trough...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003533
EISBN: 978-1-62708-180-1
.... A compromise is reached in the thermal-field-emission (or Schottky gun) SEM, where a combination of heat and electric field are used to produce electrons. These machines have better resolution than conventional SEMs, while being easier to use than the high-resolution machines. A conventional SEM also...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006639
EISBN: 978-1-62708-213-6
... a single anode. The electron source was not tightly focused. The next commercial improvement was made by Surface Science Instruments (SSI), a spin-off of Hewlett Packard. This provided a focused electron gun to create x-rays from a small, variable spot on the anode. Thus, the x-ray energy band width...