Status of OKTAVIAN I and proposal for OKTAVIAN II

This paper reports on OKTAVIAN I, as an intense deuterium-tritium (D-T) neutron source at 1.5-ns pulses of 103 D-T neutron/pulse or as a continuous neutron source of 3 x 1012 D-T neutrons/s at maximum. This national facility has been devoted mainly to studies on fusion neutron-related subjects by university researchers nationwide and has also served for international collaborations. Annual operating time is usually >1000 h for neutron supply with no special maintenance difficulties. OKTAVIAN consists of a high-current deuteron beam accelerator with some special provisions for maintaining a high D+ atomic ratio for D-T neutron production, highly effective water-cooled rotating solid Ti-T targets for continuous neutron supply, and a nanosecond intense pulse beam supply system with a small air-cooled solid Ti-T target. Special care has been taken to prevent the spread of tritium contamination in- and outside of the facility. The OKTAVIAN-II project, which proposes to supply ∼20 times more intense D-T neutrons than the present facility, is under investigation. Design studies have been carried out, and a series of benchtest experiments is in preparation