Final focus shielding designs for modern heavy-ion fusion power plant designs

Recent work in heavy-ion fusion accelerators and final focusing systems sho ws a trend towards less current per beam, and thus, a greater number of bea ms. Final focusing magnets are susceptible to nuclear heating, radiation da mage, and neutron activation. The trend towards more beams, however, means that there can be less shielding for each magnet. Excessive levels of nucle ar heating may lead to magnet quench or to an intolerable recirculating pow er for magnet cooling. High levels of radiation damage may result in short magnet lifetimes and low reliability. Finally, neutron activation of the ma gnet components may lead to difficulties in maintenance, recycling, and was te disposal. The present work expands upon previous, three-dimensional magn et shielding calculations for a modified version of the HYLIFE-II IFE power plant design. We present key magnet results as a function of the number of beams. (C) 2001 Elsevier Science B.V. All rights reserved.