Is Near-wall Conductivity a Misnomer?

2003 ◽  
Author(s):  
Serge Barral ◽  
Karol Makowski ◽  
Zbigniew Peradzynski ◽  
Michel Dudeck
Keyword(s):  
Wall Conductivity ◽  
Near Wall

The Effect of Magnetic Mirror on Near Wall Conductivity in Hall Thrusters

2008 ◽  
Vol 48 (8) ◽  
pp. 543-554 ◽  
Author(s):  
D. Yu ◽  
H. Liu ◽  
Y. Cao ◽  
H. Fu
Keyword(s):  
Magnetic Mirror ◽  
Hall Thrusters ◽  
Wall Conductivity ◽  
Near Wall

Numerical Simulation for the Effect of Wall Material on Near Wall Conductivity in Hall Thrusters

2010 ◽  
Vol 29-32 ◽  
pp. 519-524
Author(s):  
Zhi Wen Wu ◽  
Shu Shu ◽  
Da Ren Yu ◽  
Xiang Yang Liu ◽  
Ning Fei Wang
Keyword(s):  
High Performance ◽  
Channel Wall ◽  
Secondary Electron Emission ◽  
Potential Drop ◽  
Wall Material ◽  
Hall Thrusters ◽  
Wall Conductivity ◽  
Simulation Results ◽  
Absolute Potential ◽  
Near Wall

The wall material plays an important role for the electron current due to near wall conductivity in Hall Thrusters. A Monte Carlo method combined with a one dimensional steady sheath model is presented and is applied to simulate the electron conductive current due to near wall conductivity for the different channel wall materials of Hall thruster. The simulation results show that the higher the secondary electron emission (SEE) coefficient of the channel wall material is, the greater the electron conductive current is. Based on the simulation, a physical explanation is given from the viewpoint of near wall conductivity. For the channel wall material with low SEE coefficient, the secondary electrons taking part in the near wall conductivity becomes less. In addition, the absolute potential drop in the sheath near the wall increases, which means that the sheath can stop more electrons from colliding with the channel wall. And consequently the electron conductive current due to near wall conductivity is much less. The situation is vice verse for the channel wall material with high SEE coefficient. The simulation results are qualitatively in accordance with the experiments. The results can help to choose and design the wall material of the Hall Thrusters with a high performance.

Wall material effects in stationary plasma thrusters. II. Near-wall and in-wall conductivity

2003 ◽  
Vol 10 (10) ◽  
pp. 4137-4152 ◽  
Author(s):  
S. Barral ◽  
K. Makowski ◽  
Z. Peradzyński ◽  
N. Gascon ◽  
M. Dudeck
Keyword(s):  
Wall Material ◽  
Wall Conductivity ◽  
Stationary Plasma ◽  
Plasma Thrusters ◽  
Stationary Plasma Thrusters ◽  
Near Wall
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