Atomic and Nuclear Physics Answers

D-De fusion only needs one million degrees to ignite. and so is used to explore fusion in experimental reactors. I read that in a protostar, it doesn’t get much hotter, but http://hyperphysics.phy-astr.gsu.edu/hbase/NucEne/fusion.html says it produces 3.27 MeV or 4.03 MeV, producing an He-3 or a tritium.

If D-D is easy, why isn’t it explored for fusion power? Not enough energy, or is the cross section (likelihood of a reaction?) too low, or?

3.27 MeV = ~38 billion degrees kelvin: 4.02 = 47 billion. Assume you could fuse a D-D plasmoid (by inducing a current and so a field-reverse configuration “pinch” in it? Could that be enough?)—and you then slammed two or more D- He-3 plasmoids on top of that at thousands of km/sec; could the D-D fusion act as the “spark” to ignite the D + He-3 and He-3 + He-3?

If you then slammed protons on top of that, and crushed it all down with an external magnetic field, do you think you might ignite proton-proton fusion?