Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 6, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3080205
Keywords
ion beams; ion sources; plasma accelerators; plasma magnetohydrodynamics; plasma sources
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan [20740317]
- TEPCO Research Foundation
- Grants-in-Aid for Scientific Research [20740317] Funding Source: KAKEN
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The spatial distribution of an ion beam created in a magnetically expanding plasma using permanent magnets is experimentally investigated for 0.35 and 1 mTorr, where the magnetic-field strength is about 100 G in the plasma source and is decreasing into a few gauss in the diffusion chamber. The beam profile for 0.35 mTorr is weakly divergent. On the other hand, the strongly diverging beam is detected for 1 mTorr. The results are discussed from the viewpoint of the plasma-potential structures and imply the beam divergence caused by the radial electric fields in the ion acceleration region and the diffusion chamber.
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