David Kirtley
๐ค SpeakerAppearances Over Time
Podcast Appearances
And what that does is magnetic field is electromagnetic current and current running in a wire.
And what that does is pushes current back in the wire.
And so the plasma itself now pushes back on the magnetic field, pushing electrical current out of the system and recharging the capacitors where we started this whole process.
Yeah, I like the analogy of
the match and the campfire.
And I hear that a lot in fusion where, um, a lot of what steady fusion think a stellarator or tokamak is attempting to do is take a little bit of fuel that match and then add heat, um,
to ignite that match and then put it with enough fuel and in the right conditions and hold on to it for a long time that it grows into a campfire, even if they do a good job of bonfires, creating a tremendous amount of energy in that steady system, burning fuel in the same place, generating some ash, generating a lot of heat
in that reaction.
And in a traditional, in a tokamak or a stellarator, that's a lot of what you're doing is you're holding on to the heat as much as possible to keep that reaction going.
And in that, the optimal fuel is called deuterium and tritium, where you have deuterium
is a heavy isotope of hydrogen where you have an extra neutron.
And tritium is a very rare form of hydrogen that's an unstable form.
It's so rare, it's hard to get, where it has two neutrons and a proton.
And when you fuse those together at very high temperatures, at very high densities, or high enough densities and very high temperatures, they make helium, which is a charged particle, which stays inside the campfire, inside the tokamak,
continuing to heat it and stoke the flames.
And it makes a neutron, which leaves the system because it's uncharged.
It has no charge.
And in that system, it's actually ideal.
It's really great because in a campfire, you have this reaction going and you want to get the energy out of it.
You want to use it.