Secondary electron yields of carbon-coated and polished stainless steel
To increase the power throughput to a plasma of an existing lower hybrid waveguide, secondary electron production on the walls and subsequent electron multiplication must be reduced. Since carbon has a low secondary electron coefficient (delta), measurements were performed for several uhv compatible carbon coatings (Aquadag, vacuum pyrolized Glyptal, and lamp black deposited by electrophoresis) as a function of primary beam voltage (35 eV to 10 keV), surface roughness (60 through 600 grit mechanical polishing and electropolishing), coating thickness, and angle of incidence (theta). Also measured were uncoated stainless steel, Mo, Cu, Ti, TiC, C as soot and ATJ graphite. The yields were obtained by varying the sample bias and measuring the collected current while the samples were in the electron beam of a scanning Auger microprobe. This technique allows delta measurements of Auger characterized surfaces with less than or equal to .3 mm spatial resolution.
- Research Organization:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 5388339
- Report Number(s):
- PPPL-1874; ON: DE82012762; TRN: 82-014669
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COPPER
SECONDARY EMISSION
FIRST WALL
GRAPHITE
MOLYBDENUM
STAINLESS STEELS
SURFACE COATING
TITANIUM
TITANIUM CARBIDES
CARBON
PLASMA
ALLOYS
CARBIDES
CARBON COMPOUNDS
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
DEPOSITION
ELEMENTAL MINERALS
ELEMENTS
EMISSION
IRON ALLOYS
IRON BASE ALLOYS
METALS
MINERALS
NONMETALS
STEELS
THERMONUCLEAR REACTOR WALLS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
700209* - Fusion Power Plant Technology- Component Development & Materials Testing