Plane and hemispherical potential structures in magnetically expanding plasmas

Journal Article · Mon Jul 26 04:00:00 EDT 2010 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.3467857· OSTI ID:21367021

Takahashi, Kazunori; Igarashi, Yuichi; Fujiwara, Tamiya ^[1]

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1. Department of Electrical and Electronic Engineering, Iwate University, Morioka 020-8551 (Japan)

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.

• OSTI ID: 21367021
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 4 Vol. 97; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ARGON
BEAMS
CLOUD CHAMBERS
DIFFUSION CHAMBERS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
EQUIPMENT
FERMIONS
FLUID MECHANICS
FLUIDS
GAS TRACK DETECTORS
GASES
HYDRODYNAMICS
ION BEAMS
LEPTONS
MAGNETIC FIELDS
MAGNETOHYDRODYNAMICS
MAGNETS
MEASURING INSTRUMENTS
MECHANICS
NONMETALS
PERMANENT MAGNETS
PLASMA
POTENTIALS
RADIATION DETECTORS
RARE GASES