INTENSE NEUTRON FIELDS FOR RADIATION DAMAGE STUDIES
Damage, due to radiation by neutrons or charged particles, has to be taken into consideration whenever a material is used as part of a radioactive plant (fission or fusion reactor, accelerator etc.). It is necessary to be able to estimate this damage, especially for future fusion reactors due to the high investment costs. Therefore knowledge has to be gained about the damage producing mechanisms and damage correlations with the radiation source parameters (energy spectrum, flux and fluence). Up to now damage studies for fusion applications are done with fission neutrons and charged particles. To validate these radiation damage results and make them useful for fusion applications, verifications and correlations have to be established in radiation environments similar to the one of the first wall of a fusion reactor. This can only be done in a fusion reactor itself or in especially built neutron sources producing or simulating a first wall radiation environment. The type of possible sources are: 1) 14 MeV sources based on the D.T. reaction, as RTNS II at LLL Livermore with a flux of 10**13 n/cm**2 or the projected but not continued INS (Tritons impinging on a supersonic gaseous deuterium target) with a blanket to create the "non-14 MeV" energy part present in the first wall neutron spectrum; 2) D-Li sources, which have a broad spectrum, peaking at 14 MeV but with a tail up to 40 MeV neutrons. The FMIT project at HEDL is of this type; 3) Spallation neutron sources which have an evaporation spectrum and a high energy tail up to 200-300 MeV. Except the 14 MeV sources all others are simulations and damage results have to be correlated with real fusion spectra. The characteristics of the neutron sources are discussed and compared especially in relation to their use for fusion applications.
Bibliographic Reference: IAEA ADVISORY GROUP MEETING ON PROPERTIES OF NEUTRON SOURCES, LENINGRAD (USSR), JUNE 9-13, 1986 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32601 ORA
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Record Number: 1989125023900 / Last updated on: 1987-02-01
Available languages: en