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19 Sep 2005

Volume 87, Issue 12, Articles (12xxxx)

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Appl. Phys. Lett. 87, 123111 (2005); http://dx.doi.org/10.1063/1.2053370 (3 pages)

Xianghui Zhang, Ye Zhang, Jun Xu, Zhe Wang, Xihong Chen, Dapeng Yu, Peng Zhang, Hanhong Qi, and Yongjun Tian
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On the magnetic mirror effect in Hall thrusters

M. Keidar and I. D. Boyd

Appl. Phys. Lett. 87, 121501 (2005); http://dx.doi.org/10.1063/1.2053351 (3 pages) | Cited 23 times

Online Publication Date: 12 September 2005

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The magnetic mirror effect is studied in the channel of a Hall thruster. It is shown that gradients in magnetic field affect the presheath structure and electric potential distribution. The length of the radial presheath region decreases in the presence of a magnetic field gradient. The two-dimensional potential shape can be affected by proper choice of the magnetic mirror ratio. In particular, it is possible to obtain a concave shape of the potential profile in the channel even in the case of a primarily radial magnetic field. This, in turn, can be used to efficiently control the ion dynamics in the acceleration region.
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52.75.Di Ion and plasma propulsion
28.52.Av Theory, design, and computerized simulation
52.55.-s Magnetic confinement and equilibrium
52.30.Cv Magnetohydrodynamics (including electron magnetohydrodynamics)
52.40.Kh Plasma sheaths

Control and analysis of ion species in inductively coupled nitration plasma using a grid system

K. H. Bai and H. Y. Chang

Appl. Phys. Lett. 87, 121502 (2005); http://dx.doi.org/10.1063/1.2056595 (3 pages) | Cited 1 time

Online Publication Date: 15 September 2005

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We control the ion density ratio of [N+]/[N2+] with the voltage-biased grid system in inductively coupled nitration plasma. The ion density ratio is controlled from 0.39 to 0.04 with decreasing grid-biased voltage. We try to analyze the variation of the ion density ratio using the measured plasma parameters and particle balance equation. The important factor determining the ion ratio is the plasma potential difference between the source region—where plasma is generated—and the diffusion region—where the electron temperature is controlled. When the plasma potential is higher in the source region than in diffusion region, the ion density ratio is determined by the electron temperature in Region I. Inversely, the ion density ratio is determined by the electron temperature in Region II, when the plasma potential is higher in Region II than in Region I.
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52.50.Dg Plasma sources
52.25.Fi Transport properties
52.70.Ds Electric and magnetic measurements
52.40.Kh Plasma sheaths
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