TITLE

Plane and hemispherical potential structures in magnetically expanding plasmas

AUTHOR(S)
Takahashi, Kazunori; Igarashi, Yuichi; Fujiwara, Tamiya
PUB. DATE
July 2010
SOURCE
Applied Physics Letters;7/26/2010, Vol. 97 Issue 4, p041501
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Two-dimensional potential structures are measured for different gas pressure in expanding argon plasma using permanent magnets, where the magnetic field is about 100 G in the source and several gauss in the diffusion chamber. The plane potential drop is observed near the source exit for 0.35 mTorr, while the potential structure becomes hemispherical when increasing up to 1 mTorr; the hemispherical structure results in the radial divergence of the ion beam. It is found that the trajectories of the accelerated ions and the electrons overcoming the potential drop are dominated by the potential structure and magnetic-field lines, respectively.
ACCESSION #
52616450

 

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