InfraNut - 27/3/2006 3:50 PM
JET only reached about 70% (0.7) and no other have reached the 100% level that the scientists defines as "Ignition"
I think you are mixing the terms 'ignition' and 'break-even'. Latter (Q=1) has been achieved by Japanese Tokamak JT-60. Ignition (Q=infinite) is still unreached goal, and is not even necessary for practical fusion reactor.
Wikipedia article about Q explains the terms quite well.