scholarly journals Vacuum Barriers for XHV Operation of DC Electron Guns

2020 ◽  
Author(s):  
Christopher Mayes ◽  
Karl Smolenski ◽  
Val Kostroun ◽  
Nicholas Taylor ◽  
Bruce Dunham ◽  
...  
Keyword(s):  
Electron Guns

A controller for safe, convenient operation of LaB6 emitters on electron-beam instruments

1983 ◽  
Vol 41 ◽  
pp. 408-409
Author(s):  
W. J. Abramson ◽  
H. W. Estry ◽  
L. F. Allard
Keyword(s):  
Electron Beam ◽  
Control System ◽  
Thermal Shock ◽  
Appropriate Care ◽  
Electron Guns ◽  
Tungsten Filaments ◽  
Order Of Magnitude ◽  
Main Components

LaB6 emitters are becoming increasingly popular as direct replacements for tungsten filaments in the electron guns of modern electron-beam instruments. These emitters offer order of magnitude increases in beam brightness, and, with appropriate care in operation, a corresponding increase in source lifetime. They are, however, an order of magnitude more expensive, and may be easily damaged (by improper vacuum conditions and thermal shock) during saturation/desaturation operations. These operations typically require several minutes of an operator's attention, which becomes tedious and subject to error, particularly since the emitter must be cooled during sample exchanges to minimize damage from random vacuum excursions. We have designed a control system for LaBg emitters which relieves the operator of the necessity for manually controlling the emitter power, minimizes the danger of accidental improper operation, and makes the use of these emitters routine on multi-user instruments.Figure 1 is a block schematic of the main components of the control system, and Figure 2 shows the control box.

scholarly journals Increasing charge lifetime in dc polarized electron guns by offsetting the anode

2019 ◽  
Vol 22 (8) ◽  
Author(s):  
Omer Rahman ◽  
Erdong Wang ◽  
Ilan Ben-Zvi ◽  
Jyoti Biswas ◽  
John Skaritka
Keyword(s):  
Electron Guns

Computer Optimization of Electron Guns Using Beam Optics Analysis

2007 ◽  
Author(s):  
Lawrence Ives ◽  
Thuc Bui ◽  
Mike Read ◽  
John David ◽  
Hien Tran
Keyword(s):  
Beam Optics ◽  
Electron Guns ◽  
Computer Optimization
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