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

Yu, Daren; Liu, H.; Cao, Yong; Fu, Hengzhi

doi:10.1002/ctpp.200810087

Cited by 5 publications

(2 citation statements)

References 27 publications

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“…5(c), it can also be found that the plasma density near the inner wall is smaller compared with that near the outer wall in acceleration region. It is caused by the magnetic mirror effect, which has been confirmed by our former works [22].…”

Section: Various Parameters Distribution At Different Momentssupporting

confidence: 73%

Investigation of the Start Transient in a Hall Thruster

Liu

Yan

et al. 2008

Contrib. Plasma Phys.

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A two dimensional axisymmetric fully kinetic Particle-in-Cell/Monte Carlo Collision (PIC-MCC) model is used to describe the ignition process in a Hall thruster. A current peak and latter the periodic oscillation of current and electric potential are found. The corresponding evolutions of plasma density, electric potential and atom density during the ignition process are introduced in the paper. In addition, influences of mass flow rate and discharge potential on current peak are modeled and analyzed. The simulated results are consistent with former experimental results.

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Section: Various Parameters Distribution At Different Momentssupporting

confidence: 73%

Investigation of the Start Transient in a Hall Thruster

Liu

Yan

et al. 2008

Contrib. Plasma Phys.

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“…Their results also showed that a high magn etic mirror ratio improves the concavity of potential profiles, which leads to stronger ion focus in the exhaust area. Yu et al [11] studied the magnetic mirror effect on electron transport using the test particle method. They found that the asymmetry of radial electron mobility is reinforced in the presence of a magnetic mirror.…”

Section: Introductionmentioning

confidence: 99%

Magnetic mirror effect in a cylindrical Hall thruster

Jiang

Tang

Ren

et al. 2017

J. Phys. D: Appl. Phys.

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For cylindrical Hall thrusters, the magnetic field geometry is totally different from that in conventional Hall thrusters. In this study, we investigate the magnetic mirror effect in a fully cylindrical Hall thruster by changing the number of iron rings (0–5), which surround the discharge channel wall. The plasma properties inside the discharge channel and plume area are simulated with a self-developed PIC-MCC code. The numerical results show significant influence of magnetic geometry on the electron confinement. With the number of rings increasing above three, the near-wall electron density gap is reduced, indicating the suppression of neutral gas leakage. The electron temperature inside the discharge channel reaches its peak (38.4 eV) when the magnetic mirror is strongest. It is also found that the thruster performance has strong relations with the magnetic mirror as the propellant utilisation efficiency reaches the maximum (1.18) at the biggest magnetic mirror ratio. Also, the optimal magnetic mirror improves the multi-charged ion dynamics, including the ion production and propellant utilisation efficiency.

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Experimental and theoretical study on effects of magnetic field topology on near wall conductivity in a Hall thruster

Yu¹,

Li²,

Wu³

et al. 2009

Physics of Plasmas

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An experiment has been made to investigate the effect of curved magnetic field topology on near wall conductivity in the ion acceleration region of Hall thrusters. The experimental results show that the electron current due to near wall conductivity is of the minimum in the case of focused topology and increases in the cases of both less-focus and over-focus topologies. This finding cannot be explained properly by the magnetic mirror effect, which is the one and only reported effect related to the magnetic field curvature so far. Based on the analysis of interaction between the plasma and the wall, a new physical effect is proposed. The difference of magnetic field topology causes different electric potential distribution, leads to different ion flux to the wall, results in the change of sheath property and secondary electron emission, and finally affects the electron current due to near wall conductivity. This effect is further justified by the agreement between the experiment and simulation which is performed with a particle-in-cell model. Therefore, we conclude that the ion flow injection is a significant effect to near wall conductivity in the scope of curved magnetic field topology besides the magnetic mirror effect. Moreover, we find that the focus topology of magnetic field is favorable to obtain a high thruster performance from both the ion acceleration aspect and the electron conduction aspect and so is useful practically for thruster optimization.

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

Cited by 5 publications

References 27 publications

Investigation of the Start Transient in a Hall Thruster

Investigation of the Start Transient in a Hall Thruster

Magnetic mirror effect in a cylindrical Hall thruster

Experimental and theoretical study on effects of magnetic field topology on near wall conductivity in a Hall thruster

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