Efficient Production of Multiply Charged Positive Ions by Low Energy Stripping in Helium Gas
作者:
S. K. Allison,
J. Cuevas,
M. Garcia‐Munoz,
期刊:
Review of Scientific Instruments
(AIP Available online 1960)
卷期:
Volume 31,
issue 11
页码: 1193-1197
ISSN:0034-6748
年代: 1960
DOI:10.1063/1.1716849
出版商: AIP
数据来源: AIP
摘要:
``Low energy'' as used in this report means ionic and atomic beam velocities from approximately 5×107to 2×108cm/sec. In this velocity region an ion beam brought to charge equilibrium in helium gas has a much greater content of components of high positive charge than does the same beam charge equilibrated in other gases. To achieve this effect, however, the pressure of helium gas in a charge stripper or converter cell placed in the beam path must be much higher than in other gases. The predicted effect, calculated from the charge changing cross sections, is verified by experiments on the stripping of Li+to Li++in air and helium. In a qualitative experiment the proton beam of the Chicago synchrocyclotron was increased 100% by equilibrating the hydrogen constituent in a 90–10 HeH2mixture before issuing it from the ion source into the acceleration chamber.
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