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Title: Method of making radio frequency ion source 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.degree. C. to boil off the water from the binder, and then to about 750.degree. C.-850.degree. 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 ormore » the like. The glass frit preferably contains apprxoimately 45% lead oxide.« less

Inventors:
 [1];  [2]
  1. Alamo, CA
  2. Hercules, CA
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA
OSTI Identifier:
866502
Patent Number(s):
US 4725449
Assignee:
United States of America as represented by United States (Washington, DC)
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; radio; frequency; source; antenna; rf; providing; clean; coil; copper; tubing; metal; conductor; coated; tacky; organic; binder; powdered; glass; frit; sprinkling; uniformly; heated; internally; inert; gas; atmosphere; preferably; passing; electrical; heating; current; initially; 200; degree; boil; water; 750; -850; melt; burning; melted; forms; molten; coating; cooled; solidify; covered; continuous; homogeneous; impervious; substantially; uniform; thickness; affords; complete; insulation; dielectric; protection; withstand; voltage; breakdown; prevent; sputtering; doubling; plasma; generating; efficiency; energized; power; vacuum; chamber; particle; accelerator; contains; apprxoimately; 45; lead; oxide; rf antenna; electrical heating; preferably contains; preferably contain; glass coating; organic binder; particle accelerator; glass frit; metal conductor; uniform thickness; radio frequency; vacuum chamber; inert gas; substantially uniform; rf power; molten glass; gas atmosphere; electrical insulation; lead oxide; voltage breakdown; heating current; electrical heat; internally heated; complete electrical; plasma generating; metal conduct; particle accelera; /427/

Citation Formats

Ehlers, Kenneth W, and Leung, Ka-Ngo. Method of making radio frequency ion source antenna. United States: N. p., 1988. Web.
Ehlers, Kenneth W, & Leung, Ka-Ngo. Method of making radio frequency ion source antenna. United States.
Ehlers, Kenneth W, and Leung, Ka-Ngo. Fri . "Method of making radio frequency ion source antenna". United States. https://www.osti.gov/servlets/purl/866502.
@article{osti_866502,
title = {Method of making radio frequency ion source antenna},
author = {Ehlers, Kenneth W and Leung, Ka-Ngo},
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.degree. C. to boil off the water from the binder, and then to about 750.degree. C.-850.degree. 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 apprxoimately 45% lead oxide.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

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