Fabrication of polymeric microballoons for ablative inertial fusion targets

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Abstract
Low-Z polymer microballoons required for ablative inertial fusion (IF) targets, reduce radiative preheat of the fuel upon irradiation by a 351 nm laser. Furthermore, the plastic shells are relatively transparent to x rays from the imploded core, thus enabling diagnosis of the implosion. Since the targets are required to hold DT gas they must exhibit good barrier qualities along with the usual requirements for concentricity and wall uniformity stipulated for IF targets. Using a microencapsulation technique we have been able to fabricate plastic microballoons which meet these requirements. By altering experimental procedures and conditions, shells made from polyacryconitrile, polyvinyl acetate, and polystyrene have been manufactured.

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