Nova Upgrade Design Support: Threats from Radiation Effects in the Proposed Nova Upgrade.

摘要

The program described in this report deals with the proposed Nova Upgrade facility, in which Lawrence Livermore National Laboratory (LLNL) expects to generate typically 20 MJ of total fusion energy. The Nova Upgrade is considered the next practical step after Nova before work begins on development of the Laboratory Microfusion Facility by which LLNL expects to generate 100-1000 MJ of total fusion energy. SRI International's contributions have been to work with LLNL to understand the radiation-induced vaporization, melting, fracture, and fragmentation resulting from the effects of X-rays, neutrons, and debris irradiation on the target chamber wall, the steel feeder tubes of the cryogenic target holder assembly, and the optics debris shields. We have assessed the major collateral effects of direct and indirect damage from radiation and shrapnel debris on the optics debris shields and have suggested alternative materials and designs to alleviate the effects of radiation and debris.