NDLI: Fast-formed liquid surfaces for inertial confinement fusion target shells

Content Provider	IEEE Xplore Digital Library
Author	Stephens, R.B.
Copyright Year	1993
Description	Author affiliation: Gen. Atomics, San Diego, CA, USA (Stephens, R.B.)
Abstract	Advanced ICF targets will have an inner layer of solid or liquid fuel. Their inner surfaces must be smooth and contamination free. All of the current means to produce such a surface have problems: Liquid surfaces sag, solid surfaces tend to facet, and polymer-foam-stabilized surfaces are contaminated by carbon from the foam. An alternative may be to generate a liquid surface immediately before a shot by rapid thermal expansion of a fuel-saturated foam-walled capsule. This approach makes use of the large coefficient of expansion of liquid hydrogen relative to its foam matrix. The shell is filled by exposure to hydrogen vapor during cooling; liquid in the foam has a lower vapor pressure than free liquid, so the shell will fill to exactly 100%. It will stay at that fill fraction as the shell cools and the density of the liquid it contains increases. The shell may be frozen and cooled to 4 K so that it can be stored and handled in vacuum. When the shell is warmed, the liquid expands; the elastic modulus of the foam will force some liquid out of the surface. A simple analysis suggests that a 1 /spl mu/m thick liquid film might be generated in 1 /spl mu/s; that depends on the compressibility of the foam and the flow resistance of its cell structure. Surface tension would smooth this surface layer very rapidly. It would not begin to sag for 1000 /spl mu/s, so there would be sufficient time during which the layer would be satisfactory. An analysis will be presented showing the feasibility of this approach, and the constraints it puts on shell wall structure and insertion-and-shot procedures.
Starting Page	753
Ending Page	756
File Size	507176
Page Count	4
File Format	PDF
ISBN	0780314123
DOI	10.1109/FUSION.1993.518437
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1993-10-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Inertial confinement Surface contamination Solids Hydrogen Surface resistance Fuels Polymer foams Thermal expansion Cooling Surface tension
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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