First wall and limiter surfaces for plasma devices
Abstract
For a plasma device, a surface of a first wall or limiter with reduced loss of metal by erosion is provided by forming a monolayer of an alkali or alkaline earth metal on a substrate of a more negative metal. The surface exhibits a reduced loss of metal by erosion and particularly by sputtering and an increased secondary ion/neutral ratio resulting in a greater return of atoms escaping from the surface. In another aspect of the invention, the substrate includes a portion of the second metal and serves to replenish the surface layer with atoms of the second metal. In one process associated with self-generating desired surface, the metals as an alloy are selected to provide a first layer having a high concentration of the second metal in contrast to a very low concentration in the second layer and bulk to result in a surface with a monolayer of the second metal. When the combination of metals results in an intermetallic compound, selective removal of the first metal during an initial bombardment stage provides the surface layer with a predominance of the second metal.
- Inventors:
-
- Plainfield, IL
- Downers Grove, IL
- Issue Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- OSTI Identifier:
- 864774
- Patent Number(s):
- 4414176
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
G - PHYSICS G21 - NUCLEAR PHYSICS G21B - FUSION REACTORS
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:
- W-31109-ENG-38
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- wall; limiter; surfaces; plasma; devices; device; surface; reduced; loss; metal; erosion; provided; forming; monolayer; alkali; alkaline; earth; substrate; negative; exhibits; particularly; sputtering; increased; secondary; neutral; ratio; resulting; return; atoms; escaping; aspect; portion; serves; replenish; layer; process; associated; self-generating; desired; metals; alloy; selected; provide; concentration; contrast; bulk; result; combination; results; intermetallic; compound; selective; removal; initial; bombardment; stage; provides; predominance; plasma devices; alkaline earth; earth metal; surface layer; intermetallic compound; selective removal; plasma device; desired surface; stage provides; metallic compound; /376/976/
Citation Formats
Krauss, Alan R, and Gruen, Dieter M. First wall and limiter surfaces for plasma devices. United States: N. p., 1983.
Web.
Krauss, Alan R, & Gruen, Dieter M. First wall and limiter surfaces for plasma devices. United States.
Krauss, Alan R, and Gruen, Dieter M. Sat .
"First wall and limiter surfaces for plasma devices". United States. https://www.osti.gov/servlets/purl/864774.
@article{osti_864774,
title = {First wall and limiter surfaces for plasma devices},
author = {Krauss, Alan R and Gruen, Dieter M},
abstractNote = {For a plasma device, a surface of a first wall or limiter with reduced loss of metal by erosion is provided by forming a monolayer of an alkali or alkaline earth metal on a substrate of a more negative metal. The surface exhibits a reduced loss of metal by erosion and particularly by sputtering and an increased secondary ion/neutral ratio resulting in a greater return of atoms escaping from the surface. In another aspect of the invention, the substrate includes a portion of the second metal and serves to replenish the surface layer with atoms of the second metal. In one process associated with self-generating desired surface, the metals as an alloy are selected to provide a first layer having a high concentration of the second metal in contrast to a very low concentration in the second layer and bulk to result in a surface with a monolayer of the second metal. When the combination of metals results in an intermetallic compound, selective removal of the first metal during an initial bombardment stage provides the surface layer with a predominance of the second metal.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 1983},
month = {Sat Jan 01 00:00:00 EST 1983}
}