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Studies of supersonic beam formation at low temperatures for a polarized helium 3 ion source Vyse, Robert Norman
Abstract
The formation of a molecular beam using a miniature supersonic nozzle source is discussed. The results of operation at room, liquid nitrogen and liquid helium temperatures of a supersonic nozzle system designed for use in a polarized helium³ ion source are presented. It is shown that helium⁴ beam intensities at 4.2ºK are approximately 1/8 of those at 300ºK. Factors upon which the beam intensity depend have been investigated experimentally and it is found that at room temperature and a distance of 16cm from the skimmer a heliun⁴ beam intensity of 3x10¹⁶ molecules/cm²/sec is attainable under certain circumstances. This beam intensity is an improvement by a factor of 10 over the original performance of the nozzle source. Assuming a 40% transmission through the magnet and a 0.25% ionization efficiency an ion current of 0.02 microamperes is estimated for the polarized helium³ ion source.
Item Metadata
Title |
Studies of supersonic beam formation at low temperatures for a polarized helium 3 ion source
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1967
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Description |
The formation of a molecular beam using a miniature supersonic nozzle source is discussed.
The results of operation at room, liquid nitrogen and liquid helium temperatures of a supersonic nozzle system designed for use in a polarized helium³ ion source are presented. It is shown that helium⁴ beam intensities at 4.2ºK are approximately 1/8 of those at 300ºK. Factors upon which the beam intensity depend have been investigated experimentally and it is found that at room temperature and a distance of 16cm from the skimmer a heliun⁴ beam intensity of 3x10¹⁶ molecules/cm²/sec is attainable under certain circumstances.
This beam intensity is an improvement by a factor of 10 over the original performance of the nozzle source.
Assuming a 40% transmission through the magnet and a 0.25% ionization efficiency an ion current of 0.02 microamperes is estimated for the polarized helium³ ion source.
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Genre | |
Type | |
Language |
eng
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Date Available |
2011-07-27
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0084718
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.