Method of making foam-encapsulated laser targets

Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor

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156250, 156330, 176 1, 264 5, 264 28, 264 41, 264 453, 264 459, 264148, 264200, 264DIG6, B29D 2700

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active

040212807

ABSTRACT:
Foam-encapsulated laser fusion targets are fabricated by suspending fusion fuel filled shells in a solution of cellulose acetate, extruding the suspension through a small orifice into a bath of ice water, soaking the thus formed shell containing cellulose acetate gel in the water to extract impurities, freezing the gel, and thereafter freeze-drying wherein water and solvents sublime and the gel structure solidifies into a low-density microcellular foam containing one or more encapsulated fuel-filled shells. The thus formed material is thereafter cut and mounted on a support to provide laser fusion targets containing a fuel-filled shell surrounded by foam having a thickness of 10 to 60 .mu.m, a cell size of less than 2 .mu.m, and density of 0.08 to 0.6.times.10.sup.3 kg/m.sup.3. Various configured foam-encapsulated targets capable of being made by the encapsulation method are illustrated.

REFERENCES:
patent: 3276996 (1966-10-01), Lazare
patent: 3338665 (1967-08-01), Silverman
patent: 3428584 (1969-02-01), Riley
patent: 3453215 (1969-07-01), Carnall et al.
patent: 3724672 (1973-04-01), Leonard et al.
patent: 3849350 (1974-11-01), Matsko
Lewkowicz, Irena, "Spherical Hydrogen Targets for Laser-Produced Fusion", in J. Phys. D:Appl. Phys., vol. 7, 1974, pp. L61-L62, (Letter to the Editor).
Hendricks, C. D., "Hydrogen Pellet Generation for Fusion Research", in Bulletin of the American Physical Society, series II, vol. 19, Oct., 1974, pp. 915, 927, 963.

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