Negative ion source
Abstract
An ionization vessel is divided into an ionizing zone and an extraction zone by a magnetic filter. The magnetic filter prevents high-energy electrons from crossing from the ionizing zone to the extraction zone. A small positive voltage impressed on a plasma grid, located adjacent an extraction grid, positively biases the plasma in the extraction zone to thereby prevent positive ions from migrating from the ionizing zone to the extraction zone. Low-energy electrons, which would ordinarily be dragged by the positive ions into the extraction zone, are thereby prevented from being present in the extraction zone and being extracted along with negative ions by the extraction grid. Additional electrons are suppressed from the output flux using ExB drift provided by permanent magnets and the extractor grid electrical field.
- Inventors:
-
- Hercules, CA
- Alamo, CA
- Issue Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- OSTI Identifier:
- 865274
- Patent Number(s):
- 4486665
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01J - ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- DOE Contract Number:
- AC03-76SF00098
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- negative; source; ionization; vessel; divided; ionizing; zone; extraction; magnetic; filter; prevents; high-energy; electrons; crossing; positive; voltage; impressed; plasma; grid; located; adjacent; positively; biases; prevent; migrating; low-energy; ordinarily; dragged; prevented; extracted; additional; suppressed; output; flux; exb; drift; provided; permanent; magnets; extractor; electrical; field; magnetic filter; electrical field; energy electrons; permanent magnet; permanent magnets; located adjacent; energy electron; extraction zone; additional electrons; extraction grid; filter prevents; positive voltage; ionizing zone; high-energy electron; high-energy electrons; /250/376/
Citation Formats
Leung, Ka-Ngo, and Ehlers, Kenneth W. Negative ion source. United States: N. p., 1984.
Web.
Leung, Ka-Ngo, & Ehlers, Kenneth W. Negative ion source. United States.
Leung, Ka-Ngo, and Ehlers, Kenneth W. Sun .
"Negative ion source". United States. https://www.osti.gov/servlets/purl/865274.
@article{osti_865274,
title = {Negative ion source},
author = {Leung, Ka-Ngo and Ehlers, Kenneth W},
abstractNote = {An ionization vessel is divided into an ionizing zone and an extraction zone by a magnetic filter. The magnetic filter prevents high-energy electrons from crossing from the ionizing zone to the extraction zone. A small positive voltage impressed on a plasma grid, located adjacent an extraction grid, positively biases the plasma in the extraction zone to thereby prevent positive ions from migrating from the ionizing zone to the extraction zone. Low-energy electrons, which would ordinarily be dragged by the positive ions into the extraction zone, are thereby prevented from being present in the extraction zone and being extracted along with negative ions by the extraction grid. Additional electrons are suppressed from the output flux using ExB drift provided by permanent magnets and the extractor grid electrical field.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {1}
}