It's an experimental device, the ports are needed for instrumentation. A utility-scale fusor would have many fewer of them. The ITER vacuum vessel also looks p

It's an experimental device, the ports are needed for instrumentation. A utility-scale fusor would have many fewer of them. The ITER vacuum vessel also looks pretty funny, though much more symmetrical: https://www.iter.org/mach/vacuumvessel https://www.iter.org/mach/vacuumvessel The ITER design is also dramatically complicated by the need to have robots fit in there to replace blanket modules.