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Effect of Coulomb interaction on time of flight of cold antiprotons launched from an ion trapTime-of-flight spectra for Maxwell-Boltzman (MB) distributions of antiprotons initially held in an ion trap and detected after being launched through a 50-cm-long shielding drift tube have been calculated. The distributions used are of temperature 0.4-40 K, cubic length 0.003-3.0 cm, and number 10-100 particles. The mutual Coulomb repulsion of the particles causes a reduction in the number of late arrival particles expected from the MB velocity distribution. The Coulomb energy is not equally divided among the particles during the expansion. The energy is transferred preferentially to the outer particles so that the reduction in the number of slow particles is not necessarily large. The reduction factor is found to be greater than unity when the potential energy of the trapped ions is greater than about 5 percent of the ions' kinetic energy and is about 2 for the launch parameters of the Los Alamos antiproton gravity experiment.
Document ID
19930052352
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Camp, J. B.
(Los Alamos National Lab. NM, United States)
Witteborn, F. C.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 16, 2013
Publication Date
April 1, 1993
Publication Information
Publication: Review of Scientific Instruments
Volume: 64
Issue: 4
ISSN: 0034-6748
Subject Category
Nuclear And High-Energy Physics
Accession Number
93A36349
Funding Number(s)
CONTRACT_GRANT: W-7405-ENG-36
Distribution Limits
Public
Copyright
Other

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