Abstract
Comparative studies of various fusion fuel cycles show that p-11B and 3He-3He fuel cycles which yield no neutron need more studies before acceptance as fusion fuels. D-3He fuel cycle appears to be most attractive. Because of very rare terrestrial resources, breedings of 3He were so far studied. The recent discovery of lunar 3HE changed the whole picture for advanced fuels. A program of studying a D-3He/FRC fusion is just started as a US-Japan collaboration program. As a result, interdisciplinary collaborations between space and fusion research are strongly recommended to develop advanced fuel fusion.
