Partially-Ionized Gas and Associated Wear in Electron Sources for Ion Propulsion, II: Discharge Hollow Cathode

2007 ◽  
Author(s):  
Ioannis Mikellides ◽  
Ira Katz ◽  
Dan Goebel
Keyword(s):  
Hollow Cathode ◽  
Ionized Gas ◽  
Electron Sources ◽  
Ion Propulsion ◽  
Partially Ionized

Wear Mechanisms in Electron Sources for Ion Propulsion, II: Discharge Hollow Cathode

2008 ◽  
Vol 24 (4) ◽  
pp. 866-879 ◽  
Author(s):  
Ioannis G. Mikellides ◽  
Ira Katz ◽  
Dan M. Goebel ◽  
Kristina K. Jameson ◽  
James E. Polk
Keyword(s):  
Hollow Cathode ◽  
Wear Mechanisms ◽  
Electron Sources ◽  
Ion Propulsion

Numerical Simulations of the Partially Ionized Gas in a 100-A LaB6 Hollow Cathode

2015 ◽  
Vol 43 (1) ◽  
pp. 173-184 ◽  
Author(s):  
Ioannis G. Mikellides ◽  
Dan M. Goebel ◽  
Benjamin A. Jorns ◽  
James E. Polk ◽  
Pablo Guerrero
Keyword(s):  
Numerical Simulations ◽  
Hollow Cathode ◽  
Ionized Gas ◽  
Partially Ionized

Electron sources with a plasma emitter based on discharge reflection with a hollow cathode

1992 ◽  
Vol 35 (5) ◽  
pp. 401-416 ◽  
Author(s):  
V. L. Galanskii ◽  
V. A. Gruzdev ◽  
I. V. Osipov ◽  
M. G. Rempe
Keyword(s):  
Hollow Cathode ◽  
Plasma Emitter ◽  
Electron Sources

Exploring the nonextensive thermodynamics of partially ionized gas in magnetic field

2021 ◽  
Vol 104 (4) ◽  
Author(s):  
June Young Kim ◽  
Hyo-Chang Lee ◽  
Geunwoo Go ◽  
Yeong Hwan Choi ◽  
Y. S. Hwang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Ionized Gas ◽  
Nonextensive Thermodynamics ◽  
Partially Ionized

The Effects of Hall and Ion Slip on the Electrical Conductivity of Partially Ionized Gases for Magnetohydrodynamic Re-Entry Vehicle Application

1962 ◽  
Vol 84 (2) ◽  
pp. 177-184 ◽  
Author(s):  
M. J. Brunner
Keyword(s):  
Electrical Conductivity ◽  
Cross Sections ◽  
Effective Conductivity ◽  
Ionized Gas ◽  
Equilibrium Conditions ◽  
Degree Of Ionization ◽  
Slip Effects ◽  
Wide Range ◽  
Ion Slip ◽  
Partially Ionized

The presence of a partially ionized gas around a hypersonic vehicle permits the application of magnetohydrodynamic (MHD) devices during re-entry. The operation of such MHD devices on a re-entry vehicle will largely depend on the magnitude of the electrical conductivity of the gas between the electrodes. In some cases it may be necessary to seed the air in order to insure high conductivity. The operation of the re-entry vehicle at relatively low gas densities and high magnetic fields will produce Hall and ion slip effects which may materially reduce the effective conductivity between the electrodes. The electrical conductivity including Hall and ion slip effects for air is presented for a wide range of pressures and temperatures and for a typical re-entry vehicle, with and without seeding. The electrical conductivity is evaluated for equilibrium conditions considering the number density and collision cross sections for electrons, neutrals, and ions. The Hall and ion slip effects are evaluated from the degree of ionization, the cyclotron frequency, and the time between collisions for electrons, neutrals, and ions.

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