Space‐Charge Flow with Unrestricted Variation of Current Density and Energy Range

1972 ◽  
Vol 43 (6) ◽  
pp. 2698-2706 ◽  
Author(s):  
Philip J. Hart ◽  
Dan L. Wolford
Keyword(s):  
Energy Range ◽  
Space Charge ◽  
Current Density ◽  
Charge Flow

Unified Analysis of the Metal Vapour Arc

1973 ◽  
Vol 28 (3-4) ◽  
pp. 417-428 ◽  
Author(s):  
G. Ecker
Keyword(s):  
Space Charge ◽  
Electron Temperature ◽  
Current Density ◽  
Space Charge Region ◽  
Decisive Role ◽  
Emission Current Density ◽  
Mean Free Path ◽  
Vacuum Arc ◽  
Metal Vapour ◽  
Cathode Drop

Abstractfor given values of the total current density j and the cathode spot surface temperature T a unified and consistent calculation of the cathode drop, Uc , the electron temperature in the ionization region T _- the electron emission current density je , the ion current density j+ , and the extension of the space charge region lsp are presented.We find that the counter diffusion of plasma electrons into the space charge region plays a decisive role. It causes an effective space charge region extension lsp of a few plasma electron Debey lengths which in general is much less than the ion mean-free-path commonly used. Without the effect of the counter diffusing electrons, the theoretical results deviate from the experimental data by orders of magnitude.For the example of a Cu metal vapour-or vacuum arc the cathode drop is found to be approximately Uc = 15 [V], the electron temperature about T- =25000 [°K] and the ratio j+/j= 0.5.Since the analysis allows for multiple ionization the presence of multiply charged ions in the spot area can be calculated.The results of this investigation justify within the E-areas the approximations used in the analysis for the copper arc in an earlier investigation 1. Outside these E-areas a recalculation with the new results derived here may cause markable changes.

Analysis of non-laminar space-charge flow

Microwaves ◽  
1963 ◽  
pp. 533-46 ◽  
Author(s):  
E. E. Erickson ◽  
A. D. Sutherland
Keyword(s):  
Space Charge ◽  
Charge Flow
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