 What had once been a lab-led effort of mostly scientific exploration was now a Washington-led effort to build a working power-producing reactor.This was given a boost by the 1973 oil crisis, which led to greatly increased research into alternative energy systems.By the late-1970s, tokamaks had reached all the conditions needed for a practical fusion reactor; in 1978 PLT had demonstrated ignition temperatures, the next year the Soviet T-7 successfully used superconducting magnets for the first time, Doublet proved to be a success and led to almost all future designs adopting this "shaped plasma" approach.