[en] Pulse performances of two magnets for fusion applications were investigated. Also carried out were ac loss measurements on two types of wires, that is, a compacted cable and braids. One of the magnets, number1 magnet, showed extremely stable pulse performances. The other magnet, number2 magnet, went normal at a charging rate of up to 1500A in 5 seconds. This cause was attributed to large ac losses. It is pointed out that pulsed magnets would exhibit stable performances if liquid helium much more than the heat generated by ac losses existed near conductor surfaces and if enough cooling surface and large thermal margin would be guaranteed. Furthermore, a newly developed aluminum-stablilized multifilamentary composite superconducting wire is shown to have excellent properties as a conductor for pulsed magnets. 2 refs