Plane and hemispherical potential structures in magnetically expanding plasmas

Kazunori Takahashi, Yuichi Igarashi, Tamiya Fujiwara

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


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.

Original languageEnglish
Article number041501
JournalApplied Physics Letters
Issue number4
Publication statusPublished - 2010 Jul 26
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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