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Title: Fabrication of thin-wall, freestanding inertial confinement fusion targets by chemical vapor deposition

Abstract

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.

Authors:
;
Publication Date:
Research Org.:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
OSTI Identifier:
5522727
Resource Type:
Journal Article
Journal Name:
J. Vac. Sci. Technol.; (United States)
Additional Journal Information:
Journal Volume: 20:4
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 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; 700205* - Fusion Power Plant Technology- Fuel, Heating, & Injection Systems

Citation Formats

Carroll, D W, and McCreary, W J. Fabrication of thin-wall, freestanding inertial confinement fusion targets by chemical vapor deposition. United States: N. p., 1982. Web. doi:10.1116/1.571573.
Carroll, D W, & McCreary, W J. Fabrication of thin-wall, freestanding inertial confinement fusion targets by chemical vapor deposition. United States. https://doi.org/10.1116/1.571573
Carroll, D W, and McCreary, W J. Thu . "Fabrication of thin-wall, freestanding inertial confinement fusion targets by chemical vapor deposition". United States. https://doi.org/10.1116/1.571573.
@article{osti_5522727,
title = {Fabrication of thin-wall, freestanding inertial confinement fusion targets by chemical vapor deposition},
author = {Carroll, D W and McCreary, W J},
abstractNote = {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.},
doi = {10.1116/1.571573},
url = {https://www.osti.gov/biblio/5522727}, journal = {J. Vac. Sci. Technol.; (United States)},
number = ,
volume = 20:4,
place = {United States},
year = {1982},
month = {4}
}