The role of acceptance angle in measurements with ion energy analyzers: Study by numerical simulations

The importance of an acceptance angle in the plasma diagnostics with ion energy analyzers is investigated by means of numerical simulations. It is shown that wide acceptance angles result in low energy tails in measured ion distribution functions ( IDF x ) . For flowing plasmas or plasmas with beams...

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Bibliographic Details
Published in:Applied physics letters 2010-12, Vol.97 (26), p.261501-261501-3
Main Authors: Miloch, W. J., Gulbrandsen, N., Mishra, L. N., Fredriksen, Å.
Format: Article
Language:English
Subjects:
BEAMS
BENDING
CHARGED PARTICLES
COMPUTERIZED SIMULATION
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DEFORMATION
DISTRIBUTION FUNCTIONS
ELECTRIC POTENTIAL
FLUID MECHANICS
FUNCTIONS
HYDRODYNAMICS
IONS
MAGNETOHYDRODYNAMICS
MATHEMATICS
MECHANICS
NUMERICAL ANALYSIS
PLASMA
PLASMA DIAGNOSTICS
PLASMA POTENTIAL
PLASMA SIMULATION
SIMULATION
THREE-DIMENSIONAL CALCULATIONS
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Summary:The importance of an acceptance angle in the plasma diagnostics with ion energy analyzers is investigated by means of numerical simulations. It is shown that wide acceptance angles result in low energy tails in measured ion distribution functions ( IDF x ) . For flowing plasmas or plasmas with beams, the orientation of the analyzer's orifice gives different results due to bending of ion trajectories in the vicinity of the analyzer. It is demonstrated that the maximum in the IDF x is at energies lower than the plasma potential. Simulations are done with DIP3D , a three-dimensional particle-in-cell code.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3531757