it is figure number 3 . You must be looking at either first or second
OK, now I see that is quite a different design (or is that 3 different designs?). The MIT talk by Whyte visualizes that number 2 diagram as a "mirror" reactor, if I understand it correctly.
I wonder what pressures they are claiming there? Heating to 150 million K gives a ~10 fold over solar temperature (core 15.6 million K). Pressure might be 2 atmospheres, and I think someone claimed that. Without inertial confinement, any terrestrial plasma is going to be very modest pressure compared with our working solar model at 250 billion atmospheres. Confinement time: minutes to hours to a year before disassembly? Versus old Sol at essentially infinity. Lawson criterion parameters of pressure X temperature X confinement time alone suggests that the fusion thermal output of such terrestrial reactors would be zero..... but again with my "wings" on, let us ignore Lawson as not being so widely scalable. And accept that there is an "activation energy" that is reached nicely at 150 or 200 million K and is insignificant at 15 million K (not implausible from chemical thermodynamics perspective, BTW). Ignoring the Solar example (the inspiration for fusion energy since Jules Verne) giving an averaged output of 276.5 microwatts per cc. And ignoring Lockheed's two or three diverse diagrams / images..... Maybe they have something they are not willing to tell us? Unfortunately I cannot presently defend them as well as I can GF, and perhaps not at all, for what that is worth.
With the superconducting magnets apparently inside the plasma vessel and fully subject to the intense neutron flux of the "reaction" not to mention the proximity to the 100 million or more K..... Sheesh!