Double-layer ion acceleration triggered by ion magnetization in expanding radiofrequency plasma sources

Kazunori Takahashi; Christine Charles; Rod W. Boswell; Tamiya Fujiwara

doi:10.1063/1.3499653

Double-layer ion acceleration triggered by ion magnetization in expanding radiofrequency plasma sources

Kazunori Takahashi, Christine Charles, Rod W. Boswell, Tamiya Fujiwara

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

15 Citations (Scopus)

Abstract

Ion energy distribution functions downstream of the source exit in magnetically expanding low-pressure plasmas are experimentally investigated for four source tube diameters ranging from about 5 to 15 cm. The magnetic-field threshold corresponding to a transition from a simple expanding plasma to a double layer-containing plasma is observed to increase with a decrease in the source tube diameter. The results demonstrate that for the four geometries, the double layer and the accelerated ion beam form when the ion Larmour radius in the source becomes smaller than the source tube radius, i.e., when the ions become magnetized in the source tube.

Original language	English
Article number	141503
Journal	Applied Physics Letters
Volume	97
Issue number	14
DOIs	https://doi.org/10.1063/1.3499653
Publication status	Published - 2010 Oct 4
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.3499653

Cite this

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title = "Double-layer ion acceleration triggered by ion magnetization in expanding radiofrequency plasma sources",

abstract = "Ion energy distribution functions downstream of the source exit in magnetically expanding low-pressure plasmas are experimentally investigated for four source tube diameters ranging from about 5 to 15 cm. The magnetic-field threshold corresponding to a transition from a simple expanding plasma to a double layer-containing plasma is observed to increase with a decrease in the source tube diameter. The results demonstrate that for the four geometries, the double layer and the accelerated ion beam form when the ion Larmour radius in the source becomes smaller than the source tube radius, i.e., when the ions become magnetized in the source tube.",

author = "Kazunori Takahashi and Christine Charles and Boswell, {Rod W.} and Tamiya Fujiwara",

note = "Funding Information: The authors would like to thank Professor M. Lieberman from the University of California at Berkeley for helpful discussion, P. Alexander from the ANU, and Y. Shida from Iwate University for their technical assistance. This work is partially supported by a Grant-in-Aid for Young Scientists (A, Grant No. 22684031), Japan. Part of this work is also supported by TEPCO Research Foundation.",

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doi = "10.1063/1.3499653",

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AU - Takahashi, Kazunori

AU - Charles, Christine

AU - Boswell, Rod W.

AU - Fujiwara, Tamiya

N1 - Funding Information: The authors would like to thank Professor M. Lieberman from the University of California at Berkeley for helpful discussion, P. Alexander from the ANU, and Y. Shida from Iwate University for their technical assistance. This work is partially supported by a Grant-in-Aid for Young Scientists (A, Grant No. 22684031), Japan. Part of this work is also supported by TEPCO Research Foundation.

PY - 2010/10/4

Y1 - 2010/10/4

N2 - Ion energy distribution functions downstream of the source exit in magnetically expanding low-pressure plasmas are experimentally investigated for four source tube diameters ranging from about 5 to 15 cm. The magnetic-field threshold corresponding to a transition from a simple expanding plasma to a double layer-containing plasma is observed to increase with a decrease in the source tube diameter. The results demonstrate that for the four geometries, the double layer and the accelerated ion beam form when the ion Larmour radius in the source becomes smaller than the source tube radius, i.e., when the ions become magnetized in the source tube.

AB - Ion energy distribution functions downstream of the source exit in magnetically expanding low-pressure plasmas are experimentally investigated for four source tube diameters ranging from about 5 to 15 cm. The magnetic-field threshold corresponding to a transition from a simple expanding plasma to a double layer-containing plasma is observed to increase with a decrease in the source tube diameter. The results demonstrate that for the four geometries, the double layer and the accelerated ion beam form when the ion Larmour radius in the source becomes smaller than the source tube radius, i.e., when the ions become magnetized in the source tube.

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Double-layer ion acceleration triggered by ion magnetization in expanding radiofrequency plasma sources

Abstract

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