This solves the fusion reactor problem for the ramjet. It also featured a more powerful fusion reactor. SPARC would be a scaled down version of the proposed ARC fusion reactor. The primary energy generation in fusion reactor designs is from the absorption of high-energy neutrons. This is also the first (suggested) application of carbon nanotubes directly in any fusion reactor. Several international nuclear fusion reactor experiments exists or are being constructed, including ITER. One day, Seleski and his colleagues were testing a new type of fusion reactor. For similar reasons, runaway reactions cannot occur in a fusion reactor. KRIBB's nano biochips, KARI's KOMPSAT satellites, and NFRI's KSTAR nuclear fusion reactor. It was the first industrial fusion reactor to use superconducting magnets to control the plasma. Despite research having started in the 1950s, no commercial fusion reactor is expected before 2050. The experimental fusion reactor ITER and the National Ignition Facility (NIF) will use deuterium-tritium fuel. Japan developed the KOYO-F fusion reactor design and laser inertial fusion test (LIFT) experimental reactor. But any terrestrial fusion reactor will be optically thin for x-rays of this energy range. In 2017 UK's fusion reactor ST40 operated by Tokamak Energy generated "first plasma".