scholarly journals Design Considerations For Low Field Short Photo-Injected RF Electron Gun With High Charge Electron Bunch

2004 ◽  
Author(s):  
Xiangyun Chang
Keyword(s):  
Electron Bunch ◽  
Electron Gun ◽  
High Charge ◽  
Design Considerations ◽  
Low Field

High-charge energetic electron bunch generated by 100 TW laser pulse

2012 ◽  
Vol 19 (3) ◽  
pp. 033106 ◽  
Author(s):  
Baifei Shen ◽  
Yuchi Wu ◽  
Kegong Dong ◽  
Bin Zhu ◽  
Yuqiu Gu ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Electron Bunch ◽  
Energetic Electron ◽  
High Charge

High-charge energetic electron bunch generated by multiple intersecting lasers

2018 ◽  
Vol 25 (8) ◽  
pp. 083102
Author(s):  
Lei Yang ◽  
Zhigang Deng ◽  
Chi Jiang ◽  
Fan Yang ◽  
Ruirui Ma
Keyword(s):  
Electron Bunch ◽  
Energetic Electron ◽  
High Charge

High-charge energetic electron bunch generated by intersecting laser pulses

2013 ◽  
Vol 20 (3) ◽  
pp. 033102 ◽  
Author(s):  
Lei Yang ◽  
Zhigang Deng ◽  
C. T. Zhou ◽  
M. Y. Yu ◽  
Xingang Wang
Keyword(s):  
Electron Bunch ◽  
Energetic Electron ◽  
Laser Pulses ◽  
High Charge

A High Performance Energy Analyzer for Use in Electron Scanning Microscopy

1969 ◽  
Vol 27 ◽  
pp. 14-15
Author(s):  
A. V. Crewe ◽  
M. Isaacson ◽  
D. Johnson
Keyword(s):  
High Performance ◽  
Vertical Plane ◽  
Median Plane ◽  
Electron Gun ◽  
Uniform Field ◽  
Loss Mechanism ◽  
Electron Scanning Microscopy ◽  
Sector Type ◽  
Double Focusing ◽  
Electron Energy Loss

A double focusing magnetic spectrometer has been constructed for use with a field emission electron gun scanning microscope in order to study the electron energy loss mechanism in thin specimens. It is of the uniform field sector type with curved pole pieces. The shape of the pole pieces is determined by requiring that all particles be focused to a point at the image slit (point 1). The resultant shape gives perfect focusing in the median plane (Fig. 1) and first order focusing in the vertical plane (Fig. 2).

Observation of Phase Contrast Images in STEM and CTEM Modes by Using 100 kV Field Emission Electron Gun

1974 ◽  
Vol 32 ◽  
pp. 390-391
Author(s):  
Y. Harada ◽  
T. Goto ◽  
H. Koike ◽  
T. Someya
Keyword(s):  
Field Emission ◽  
Phase Contrast ◽  
Image Formation ◽  
Fresnel Diffraction ◽  
Experimental Results ◽  
Electron Gun ◽  
Scanning Microscopy ◽  
Emission Electron ◽  
Lattice Images

Since phase contrasts of STEM images, that is, Fresnel diffraction fringes or lattice images, manifest themselves in field emission scanning microscopy, the mechanism for image formation in the STEM mode has been investigated and compared with that in CTEM mode, resulting in the theory of reciprocity. It reveals that contrast in STEM images exhibits the same properties as contrast in CTEM images. However, it appears that the validity of the reciprocity theory, especially on the details of phase contrast, has not yet been fully proven by the experiments. In this work, we shall investigate the phase contrast images obtained in both the STEM and CTEM modes of a field emission microscope (100kV), and evaluate the validity of the reciprocity theory by comparing the experimental results.

Structure and migration of planar defects in crystals observed in atomic scale

1978 ◽  
Vol 36 (1) ◽  
pp. 284-285 ◽  
Author(s):  
H. Hashimoto ◽  
Y. Sugimoto ◽  
Y. Takai ◽  
H. Endoh
Keyword(s):  
Electron Microscope ◽  
Rotation Angle ◽  
Crystal Surface ◽  
Electron Gun ◽  
Atomic Scale ◽  
Present Observation ◽  
Twist Boundary ◽  
Optical Magnification ◽  
Zinc Crystal ◽  
And Migration

As was demonstrated by the present authors that atomic structure of simple crystal can be photographed by the conventional 100 kV electron microscope adjusted at “aberration free focus (AFF)” condition. In order to operate the microscope at AFF condition effectively, highly stabilized electron beams with small energy spread and small beam divergence are necessary. In the present observation, a 120 kV electron microscope with LaB6 electron gun was used. The most of the images were taken with the direct electron optical magnification of 1.3 million times and then magnified photographically.1. Twist boundary of ZnSFig. 1 is the image of wurtzite single crystal with twist boundary grown on the surface of zinc crystal by the reaction of sulphur vapour of 1540 Torr at 500°C. Crystal surface is parallel to (00.1) plane and electron beam is incident along the axis normal to the crystal surface. In the twist boundary there is a dislocation net work between two perfect crystals with a certain rotation angle.

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