"OKTAVIAN-I, II. As D-T Neutron Sources for Studies of Radiation Effects on Plasma Diagnostics"

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Oktavian, which has been operated at Suita Campus. Osaka Univ. from 1980,devoted his main machine time to Fusion Neutronics Studies. So far. the share of radiation effects studies was briefly less than 20% of operation hours of Oktavian. though he was useful to observe the effects on radiation sensitive materials like as semiconductors, photo-electric elements, and others under 14Mev neutron irradiation. Major experimental activities on radiation damage effects under D-T neutron field was reported with comparision of damage effects due to γ irradiation under the separated paper from our group to this WS. Here the discussion should be concentrated to the neutron source. His principale characteristics as a neutron source for irradiation are the intensity and spectral & spacial distribution of D-T neutrons produced by the Rotating Target. The neutron yield of OKTAVIAN was used to be max. 4×10^<12>n/sec with 23mA continuous deutron ion beam at the target position. The pulsed intensity is 10^4n/pulse with 1.5 ns pulse width. The strong angular depedency and specral change is observed in neutron field produced from the water cooling rotating target. This may cause the difficulties of source calibration on accurate experiments for D-T neutron transport, so far, present our integral observation may accept such ambiguity, because we do not intend to see the fine structure of radiation damage phenomenon. However, we may be required in near future to provide more homogeneous irradiation field with accurate data after finding out of empirical neutron-γ conversion factor. and larger test field for real scale dignostics system, not for each separated components. And the studies for the fusion-fission corellation law may ask easy handling to make very similar physical experimental conditions. To reply many national requirements for future studies of radiation damage effects and instrumentation calibration as well as for studies of D-T fusion neutronics, OKTAVIAN-I had been cosidered to be revised by minor design change, mainly in target assembly. But, several studies indicated the severe restricion of old and poor foundation building. In additional condition, Japan-US Collaboration for RINS-II Utilization may be terminated in the near future. From the last 1985 fisical years, it was started to design newly OKTAVIAN-II, as a national facility for university researchers, by our group with industrial volunteers. At present conceptional design, we intend the 10 times of continious neutron yield, and 100 times of pulsed neutron yield of the OKTAVIAN-I, the former characteristics of our design is near value of US RTNS-II, the latter may be very unique characteristics for time dependent damage experiment and calibration of pulsed fusion diagnotics as well as many precise fusion neutronic experiment. Major R&D items may include developement of Tritum Target and High Beam Current Pulsing Technique. Total budget to be requested for whole project is very breafly estimated between 15 and 20M$.
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"OKTAVIAN-I, II. As D-T Neutron Sources for Studies of Radiation Effects on Plasma Diagnostics"

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