Influence of space charges on the field transition in gas-insulated DC systems

Author(s):  
Maria Hering ◽  
Thomas Gotz ◽  
Joachim Speck ◽  
Steffen Grossmann ◽  
Uwe Riechert
1997 ◽  
Vol 3 (S2) ◽  
pp. 609-610 ◽  
Author(s):  
B.L. Thiel ◽  
M.R. Hussein-Ismail ◽  
A.M. Donald

We have performed a theoretical investigation of the effects of space charges in the Environmental SEM (ESEM). The ElectroScan ESEM uses an electrostatic field to cause gas cascade amplification of secondary electron signals. Previous theoretical descriptions of the gas cascade process in the ESEM have assumed that distortion of the electric field due to space charges can be neglected. This assumption has now been tested and shown to be valid.In the ElectroScan ESEM, a positively biased detector is located above the sample, creating an electric field on the order of 105 V/m between the detector and sample surface. Secondary electrons leaving the sample are cascaded though the gas, amplifying the signal and creating positive ions. Because the electrons move very quickly through the gas, they do not accumulate in the specimen-to-detector gap. However, the velocity of the positive ions is limited by diffusion.


1970 ◽  
Vol 20 (9) ◽  
pp. 979-984
Author(s):  
P. Novotný ◽  
J. Kaczér

2019 ◽  
Vol 3 (5) ◽  
Author(s):  
Fei Xiong ◽  
Lin Xie ◽  
Luran Zhang ◽  
Jiyang Xie ◽  
Hui Zhang ◽  
...  

2002 ◽  
Vol 230-232 ◽  
pp. 575-578
Author(s):  
Eugen R. Neagu ◽  
José N. Marat-Mendes ◽  
C.J. Dias ◽  
Radu Neagu

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