ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
The ion beams are produced by a cylindrical thermal contact-ionization plasma source with an electrostatic lens system. The source plasma is produced at the inside surface of a 5-mm-diam 20-mm-long Re foil cylinder protected with a W cylinder. The surface is heated up to 3000 K by electron bombardment. The material to be ionized is fed to the surface through a guide pipe from a reservoir. Generation of all alkaline metal ions have been tested and a beam current of hundreds of μA is obtained. The efficiency for Li+ production is 30%, while that for Cs+ is nearly 100%. Alkaline earth ion beams, except Mg, are generated. A current of Ba+ up to 200 μA is obtained, while a Tl+ beam of over 200 μA is achieved. Halogen negative ion beams, except F−, of the order of 10 μA are also obtained when alkali halides are used. Attempts to extract Li− from the source are also being made.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1144971
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