Mechanical Design and Analysis of an Indirect-drive Cryogenic Target

摘要

Cryogenic target based on indirect-drive concept is concerned widely in the inertial confinement fusion field. An indirect-drive cryogenic target is designed to field on the SGIII laser device of China. Capsule and hohlraum design refers to the NIF ignition target Rev5. The target fabrication encounters many engineering issues because of complicated structures and low temperature experimental environment. A tapered capillary is used to feed and support the capsule. And a jacket is designed to solve capillary fixing, gas filling, sealing and other structural issues. Forming a uniform fuel ice-layer on the capsule inner faces withstanding gravity or surface tension effect is a key feature of this cryogenic target. Thermal mechanical package is designed to have the best capacity of controlling temperature gradient across the capsule with a thermally noncontact method. Thermal analyses conclude the best interface conductance arguments and jacket material for the TMP design. Besides, structural reliability of the target after cooling is conservatively analyzed with an optimized model.