Theoretical study of particle charging and entrapment in a cylindrical ion beam

Persistent Link:
http://hdl.handle.net/10150/277287
Title:
Theoretical study of particle charging and entrapment in a cylindrical ion beam
Author:
Brown, Douglas, 1955-
Issue Date:
1990
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
A particle within an ion beam is subjected to positive and negative currents. These currents deposit a net charge on the particle which interacts with the potential of the beam. A model is presented which describes this charging, the time required to attain an arbitrary charge, and the resulting coulomb force. Confinement by the beam is investigated through comparison of the electric force to the opposing force of gravity. To quantify this comparison, a normalized force is defined which, when negative, predicts those spatial regions where particle entrapment can occur. Utilizing a specially written VAX-Fortran program, the behavior of this force was characterized as a function of beam parameters. Regions were predicted in which particle confinement can arise and it was found that the magnitude of the trapping force varied significantly with those parameters that affect the beam-ion density. Moreover, calculations of the charging time revealed that the time to attain the minimum trapping charge was sufficiently short so as not to preclude entrapment.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Engineering, Electronics and Electrical.; Physics, General.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College
Degree Grantor:
University of Arizona
Advisor:
O'Hanlon, John

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleTheoretical study of particle charging and entrapment in a cylindrical ion beamen_US
dc.creatorBrown, Douglas, 1955-en_US
dc.contributor.authorBrown, Douglas, 1955-en_US
dc.date.issued1990en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractA particle within an ion beam is subjected to positive and negative currents. These currents deposit a net charge on the particle which interacts with the potential of the beam. A model is presented which describes this charging, the time required to attain an arbitrary charge, and the resulting coulomb force. Confinement by the beam is investigated through comparison of the electric force to the opposing force of gravity. To quantify this comparison, a normalized force is defined which, when negative, predicts those spatial regions where particle entrapment can occur. Utilizing a specially written VAX-Fortran program, the behavior of this force was characterized as a function of beam parameters. Regions were predicted in which particle confinement can arise and it was found that the magnitude of the trapping force varied significantly with those parameters that affect the beam-ion density. Moreover, calculations of the charging time revealed that the time to attain the minimum trapping charge was sufficiently short so as not to preclude entrapment.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectEngineering, Electronics and Electrical.en_US
dc.subjectPhysics, General.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorO'Hanlon, Johnen_US
dc.identifier.proquest1340270en_US
dc.identifier.bibrecord.b26251589en_US
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