The X-ray collector is described briefly in the patent, and a cross-section thereof depicted in Figure 10, but LPP has not actually constructed one (as far as I am aware) and will not likely do so until after it has demonstrated the feasibility of fusion energy production. Claims about the efficiency of the X-ray collector are based on other labs’ work.
Note: although some depictions of a Focus Fusion reactor show a spherical X-ray collector, which has been dubbed the “onion”, a cylindrical X-ray collector will likely be more practical to produce.
