Fabrication of thin-wall, freestanding inertial confinement fusion targets by chemical vapor deposition
To meet the requirements for plasma physics experiments in the inertial confinement fusion (ICF) program, chemical vapor deposition (CVD) in fluid beds was used to fabricate freestanding tungsten spheres and cylinders with wall thicknesses less than 5.0 ..mu..m. Molybdenum and molybdenum alloy (TZM) mandrels of the desired geometry were suspended in a carrier bed of dense microspheres contained in an induction-heated fluid-bed reactor. The mandrels were free to float randomly through the bed, and using the reaction WF/sub 6/+3H/sub 2/..-->../sub /KW +6HF, very fine-grained tungsten was deposited onto the surface at a rate and in a grain size determined by temperature, gas flow rate, system pressure, and duration of the reaction. After coating, a portion of each mandrel was exposed by hole drilling or grinding. The mandrel was then removed by acid leaching, leaving a freestanding tungsten shape. Experimental procedures, mandrel preparation, and results obtained are discussed.
- Research Organization:
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545
- OSTI ID:
- 5522727
- Journal Information:
- J. Vac. Sci. Technol.; (United States), Vol. 20:4
- Country of Publication:
- United States
- Language:
- English
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LASER TARGETS
FABRICATION
MOLYBDENUM
VAPOR DEPOSITED COATINGS
MOLYBDENUM ALLOYS
TUNGSTEN
CHEMICAL VAPOR DEPOSITION
CYLINDERS
FOILS
HIGH TEMPERATURE
INERTIAL CONFINEMENT
LASER IMPLOSIONS
MICROSPHERES
WALLS
ALLOYS
CHEMICAL COATING
COATINGS
CONFINEMENT
DEPOSITION
ELEMENTS
IMPLOSIONS
METALS
PLASMA CONFINEMENT
SURFACE COATING
TARGETS
TRANSITION ELEMENTS
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