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ID 20751
file
creator
Takai, Ryota
Nakayama, Kenji
Saiki, Wataru
Ito, Kiyokazu
subject
nonlinear resonance
one-component plasma
linear Paul trap
space charge effect
charged particle beam
NDC
Physics
abstract
The effects of nonlinear resonances in a linear Paul trap have been investigated through systematic experiments and numerical simulations. The main causes of the nonlinearity that affects the stability of the ion motion are the use of circular (rather than hyperbolic) electrodes, their misalignments, and Coulomb interactions among the ions. A particle tracking code based on a two-dimensional model is employed to study the efficiency of plasma storage and to confirm the existence of nonlinear resonance stop bands. Experiments are performed with Ar+ plasmas that are eventually detected by a Faraday cup after a short storage. The obtained data are compared with numerical simulations in which the exact three-dimensional structure of the trap system has been incorporated. Several nonlinear stop bands have been experimentally identified inside the Mathieu stability region. It is demonstrated that the location of a resonance stop band moves due to the space-charge potential depending on the number of confined ions.
journal title
Journal of the Physical Society of Japan
volume
Volume 76
issue
Issue 1
start page
014802-1
end page
014802-8
date of issued
2007-01-15
publisher
日本物理学会
issn
0031-9015
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
Copyright (c) 2007 The Physical Society of Japan
relation url
department
Graduate School of Advanced Sciences of Matter