In terms of nuclear fusion reactors, what does 'energy break point' mean?

Question

In terms of nuclear fusion reactors, what does 'energy break point' mean?

Answer 1

It's the operating condition where more energy comes out of the reactor that you are putting in to make it work. Obviously a very important criterion for practical power generation.

Answer 2

In order to maintain the stability of plasma in the fusion reactor the loss of particles and heat in all channels must be suffciently slow.  This may be energy confiniment. Here energy break point is an index.

Answer 3

probably it refers to a reactor or reaction where the energy that you get out of it is at least as much as you put in to make the reaction happen. Until you reach this point you are just putting energy in and not getting anything (extra) out of it.