Method of making radio frequency ion source antenna and such antenna
Abstract
In the method, the radio frequency (rf) antenna is made by providing a clean coil made of copper tubing or other metal conductor, which is coated with a tacky organic binder, and then with a powdered glass frit, as by sprinkling the frit uniformly over the binder. The coil is then heated internally in an inert gas atmosphere, preferably by passing an electrical heating current along the coil. Initially, the coil is internally heated to about 200/sup 0/C to boil off the water from the binder, and then to about 750 to 850/sup 0/C to melt the glass frit, while also burning off the organic binder. The melted frit forms a molten glass coating on the metal coil, which is then cooled to solidify the glass, so that the metal coil is covered with a thin continuous homogeneous impervious glass coating of substantially uniform thickness. The glass coating affords complete electrical insulation and complete dielectric protection for the metal coil of the rf antenna, to withstand voltage breakdown and to prevent sputtering, while also doubling the plasma generating efficiency of the rf antenna, when energized with RF power in the vacuum chamber of an ion source for a particle acceleratormore »
- Inventors:
- Issue Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- OSTI Identifier:
- 5434589
- Application Number:
- ON: DE86013727
- Assignee:
- Dept. of Energy
- DOE Contract Number:
- AC03-76SF00098
- Resource Type:
- Patent
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; ANTENNAS; DESIGN; RF SYSTEMS; RADIO EQUIPMENT; ELECTRICAL EQUIPMENT; ELECTRONIC EQUIPMENT; EQUIPMENT; 420800* - Engineering- Electronic Circuits & Devices- (-1989)
Citation Formats
Ehlers, K W, and Leung, K N. Method of making radio frequency ion source antenna and such antenna. United States: N. p., 1985.
Web.
Ehlers, K W, & Leung, K N. Method of making radio frequency ion source antenna and such antenna. United States.
Ehlers, K W, and Leung, K N. Wed .
"Method of making radio frequency ion source antenna and such antenna". United States.
@article{osti_5434589,
title = {Method of making radio frequency ion source antenna and such antenna},
author = {Ehlers, K W and Leung, K N},
abstractNote = {In the method, the radio frequency (rf) antenna is made by providing a clean coil made of copper tubing or other metal conductor, which is coated with a tacky organic binder, and then with a powdered glass frit, as by sprinkling the frit uniformly over the binder. The coil is then heated internally in an inert gas atmosphere, preferably by passing an electrical heating current along the coil. Initially, the coil is internally heated to about 200/sup 0/C to boil off the water from the binder, and then to about 750 to 850/sup 0/C to melt the glass frit, while also burning off the organic binder. The melted frit forms a molten glass coating on the metal coil, which is then cooled to solidify the glass, so that the metal coil is covered with a thin continuous homogeneous impervious glass coating of substantially uniform thickness. The glass coating affords complete electrical insulation and complete dielectric protection for the metal coil of the rf antenna, to withstand voltage breakdown and to prevent sputtering, while also doubling the plasma generating efficiency of the rf antenna, when energized with RF power in the vacuum chamber of an ion source for a particle accelerator or the like. The glass frit preferably contains approximately 45% lead oxide.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed May 22 00:00:00 EDT 1985},
month = {Wed May 22 00:00:00 EDT 1985}
}