Axial force imparted by a current-free magnetically expanding plasma

Kazunori Takahashi; Trevor Lafleur; Christine Charles; Peter Alexander; Rod W. Boswell

doi:10.1063/1.4747701

Axial force imparted by a current-free magnetically expanding plasma

Kazunori Takahashi, Trevor Lafleur, Christine Charles, Peter Alexander, Rod W. Boswell

Research output: Contribution to journal › Article › peer-review

33 Citations (Scopus)

Abstract

The axial force imparted from a magnetically expanding, current-free, radiofrequency plasma is directly measured. For an argon gas flow rate of 25 sccm and an effective rf input power of ∼ 800 W, a maximum force of ∼ 6 mN is obtained; ∼ 3 mN of which is transmitted via the expanding magnetic field. The measured forces are reasonably compared with a simple fluid model associated with the measured electron pressure. The model suggests that the total force is the sum of an electron pressure inside the source and a Lorentz force due to the electron diamagnetic drift current and the applied radial magnetic field. It is shown that the Lorentz force is greatest near the magnetic nozzle surface where the radial pressure gradient is largest.

Original language	English
Article number	083509
Journal	Physics of Plasmas
Volume	19
Issue number	8
DOIs	https://doi.org/10.1063/1.4747701
Publication status	Published - 2012 Aug
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics

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10.1063/1.4747701

Cite this

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title = "Axial force imparted by a current-free magnetically expanding plasma",

abstract = "The axial force imparted from a magnetically expanding, current-free, radiofrequency plasma is directly measured. For an argon gas flow rate of 25 sccm and an effective rf input power of ∼ 800 W, a maximum force of ∼ 6 mN is obtained; ∼ 3 mN of which is transmitted via the expanding magnetic field. The measured forces are reasonably compared with a simple fluid model associated with the measured electron pressure. The model suggests that the total force is the sum of an electron pressure inside the source and a Lorentz force due to the electron diamagnetic drift current and the applied radial magnetic field. It is shown that the Lorentz force is greatest near the magnetic nozzle surface where the radial pressure gradient is largest.",

author = "Kazunori Takahashi and Trevor Lafleur and Christine Charles and Peter Alexander and Boswell, {Rod W.}",

note = "Funding Information: The authors would like to thank Professor A. Fruchtman of the Holon Institute of Technology for many useful discussions. A part of this work is financially supported by an Australian Research Council Discovery grant (DP 1096653), an Australian Research Council Linkage grant (LP 0883456), a Grant-in-Aid for Young Scientists (A 22684031) from MEXT in Japan, and the TEPCO Research Foundation.",

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AU - Takahashi, Kazunori

AU - Lafleur, Trevor

AU - Charles, Christine

AU - Alexander, Peter

AU - Boswell, Rod W.

N1 - Funding Information: The authors would like to thank Professor A. Fruchtman of the Holon Institute of Technology for many useful discussions. A part of this work is financially supported by an Australian Research Council Discovery grant (DP 1096653), an Australian Research Council Linkage grant (LP 0883456), a Grant-in-Aid for Young Scientists (A 22684031) from MEXT in Japan, and the TEPCO Research Foundation.

PY - 2012/8

Y1 - 2012/8

N2 - The axial force imparted from a magnetically expanding, current-free, radiofrequency plasma is directly measured. For an argon gas flow rate of 25 sccm and an effective rf input power of ∼ 800 W, a maximum force of ∼ 6 mN is obtained; ∼ 3 mN of which is transmitted via the expanding magnetic field. The measured forces are reasonably compared with a simple fluid model associated with the measured electron pressure. The model suggests that the total force is the sum of an electron pressure inside the source and a Lorentz force due to the electron diamagnetic drift current and the applied radial magnetic field. It is shown that the Lorentz force is greatest near the magnetic nozzle surface where the radial pressure gradient is largest.

AB - The axial force imparted from a magnetically expanding, current-free, radiofrequency plasma is directly measured. For an argon gas flow rate of 25 sccm and an effective rf input power of ∼ 800 W, a maximum force of ∼ 6 mN is obtained; ∼ 3 mN of which is transmitted via the expanding magnetic field. The measured forces are reasonably compared with a simple fluid model associated with the measured electron pressure. The model suggests that the total force is the sum of an electron pressure inside the source and a Lorentz force due to the electron diamagnetic drift current and the applied radial magnetic field. It is shown that the Lorentz force is greatest near the magnetic nozzle surface where the radial pressure gradient is largest.

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Axial force imparted by a current-free magnetically expanding plasma

Abstract

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