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28 Nov 2011

Volume 99, Issue 22, Articles (22xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 99, 221902 (2011); http://dx.doi.org/10.1063/1.3663578 (3 pages)

Aparna Deshpande, Kai Felix Braun, and Saw-Wai Hla
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Kinetic solutions for electrons in multi-cusp ion source

Hualin Zhan (占华琳) and Chundong Hu (胡纯栋)

Appl. Phys. Lett. 99, 221501 (2011); http://dx.doi.org/10.1063/1.3664347 (3 pages)

Online Publication Date: 29 November 2011

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Some analytical kinetic solutions are obtained for the primary and plasma electrons in multi-cusp ion source. The characteristics based on these solutions are discussed, such as frictional coefficient, collision frequency, electron current, electron diffusion, electron density, and electrical conductivity. A code based on one of these solutions is developed to discuss the plasma electrons diffusion; the simulation results are qualitatively consistent with our current experiences.
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52.25.Fi Transport properties
52.40.Mj Particle beam interactions in plasmas
52.65.-y Plasma simulation
52.20.Fs Electron collisions

Effects of ionization distribution on plasma beam focusing characteristics in Hall thrusters

Zhongxi Ning, Hui Liu, Daren Yu, and Zhongxiang Zhou

Appl. Phys. Lett. 99, 221502 (2011); http://dx.doi.org/10.1063/1.3665632 (3 pages) | Cited 3 times

Online Publication Date: 30 November 2011

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The relationship between ionization distribution and divergence of plasma beam in a Hall thruster is investigated using spectrum and probe methods. Experimental results indicate that the shift of ionization region towards the exit of channel causes the reduction of accelerating field and the enhancement of electron thermal pressure effect, which result in further deviation of equipotential lines to magnetic field lines and further increase in divergence of plasma beam. It is, therefore, suggested that to put the ionization region deep inside the channel and separate it from the acceleration region at the design, and development stage is helpful to improve the plasma beam focusing characteristics of a Hall thruster.
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52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.70.Ds Electric and magnetic measurements
52.75.Di Ion and plasma propulsion
52.80.-s Electric discharges
52.25.Fi Transport properties
52.25.Jm Ionization of plasmas

Electric field step in air gap streamer discharges

Rong Zeng, Chijie Zhuang, Zhanqing Yu, Zhizhao Li, and Yinan Geng

Appl. Phys. Lett. 99, 221503 (2011); http://dx.doi.org/10.1063/1.3665633 (3 pages)

Online Publication Date: 30 November 2011

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Electric field (E-field) in air gap streamer discharges under positive lightning impulse was measured by specifically developed integrated electro-optic sensors. An E-field step phenomenon was observed. The E-field firstly agreed with the Laplace field, then suddenly increased with a rise time of μs. The occurrence probability of this phenomenon increased as the applied voltage increased. The discharge current waveforms and photos taken by a fast camera prove the E-field step was caused by the space net charge. From the E-step rise time and the corona area range, the average electron drift speed under the experiment situation was estimated about 0.2 × 106 – 0.6× 106 m/s.
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52.80.Hc Glow; corona
52.25.Fi Transport properties
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
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