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. / Science, Faculty of / Physics and Astronomy, Department of / Graduate
| Identifer | oai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/36359 |
| Date | January 1967 |
| Creators | Vyse, Robert Norman |
| Publisher | University of British Columbia |
| Source Sets | University of British Columbia |
| Language | English |
| Detected Language | English |
| Type | Text, Thesis/Dissertation |
| 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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