Superconducting Properties and Microstructure of ${\rm V}_{3}{\rm Ga}$ Wires Using High Ga Content ${\rm TiGa}_{3}$ and ${\rm V}_{2}{\rm Ga}_{5}$ Compounds

V
₃
Ga compound has a shorter radioactive decay time compared with Nb-based compounds and it will be one of the candidate superconducting magnet materials for advanced low activation fusion reactor systems including shutdown scenario and material recycle. Recently, we succeeded in developing new V
₃
Ga multifilamentary wires fabricated via the Powder In-Tube (PIT) process using high Ga content Cu-Ga binary phase compounds. We also found that high Ga content in the precursor promoted the formation of the stoichiometric V
₃
Ga phase and it was effective in improving superconducting properties.