Dynamic concentration of positive ions near the axis of an electron plasma column
Journal Article
·
· Phys. Fluids; (United States)
A steady-state non-neutral plasma, generated by Penning discharge, is used as a focusing element for MeV ion beams. An almost pure electron plasma column is produced which has nearly constant density (10/sup 9/--10/sup 10/ cm/sup -3/) inside a radius of several millimeters. The background gas is at a pressure of 10/sup -7/ torr or less. A model calculation is presented which shows that although orbital damping is negligible, positive ions created by electron-neutral collisions are dynamically concentrated near the axis of the plasma. Light emission by excited ions in the plasma is observed to be brightest in a thin line along the axis. The measured radial profile of relative light intensity is in good agreement with the calculated ion distribution. A radial charge density profile of the plasma, which is inferred from beam deflection measurements, is depressed by several percent near the axis due to positive ions concentrated there.
- Research Organization:
- Department of Physics, University of Oregon, Eugene, Oregon 97403
- OSTI ID:
- 5453360
- Journal Information:
- Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 27:1; ISSN PFLDA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
AMPLITUDES
BEAM INJECTION
CATIONS
CHARGED PARTICLES
COLLISIONS
ELECTRIC DISCHARGES
ELECTRON COLLISIONS
ELECTRON GAS
ELECTRON-ION COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ENERGY LEVELS
ENERGY RANGE
EXCITED STATES
FOCUSING
HIGH VACUUM
ION BEAM INJECTION
ION COLLISIONS
ION DENSITY
IONS
MAGNETIC FIELDS
MEV RANGE
MOLECULAR IONS
MOLECULE COLLISIONS
ORBITS
PENNING DISCHARGES
PLASMA
SPECTRA
STEADY-STATE CONDITIONS
TRAPS
VISIBLE SPECTRA
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
AMPLITUDES
BEAM INJECTION
CATIONS
CHARGED PARTICLES
COLLISIONS
ELECTRIC DISCHARGES
ELECTRON COLLISIONS
ELECTRON GAS
ELECTRON-ION COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ENERGY LEVELS
ENERGY RANGE
EXCITED STATES
FOCUSING
HIGH VACUUM
ION BEAM INJECTION
ION COLLISIONS
ION DENSITY
IONS
MAGNETIC FIELDS
MEV RANGE
MOLECULAR IONS
MOLECULE COLLISIONS
ORBITS
PENNING DISCHARGES
PLASMA
SPECTRA
STEADY-STATE CONDITIONS
TRAPS
VISIBLE SPECTRA