Title :
Operational activity evaluation of ITER diagnostic neutron activation system
Author :
Cheon, M.S. ; Seon, C.R. ; Pak, S. ; Lee, H.G. ; Bertalot, L. ; Forrest, R.A.
Author_Institution :
Nat. Fusion Res. Inst., Daejeon, South Korea
Abstract :
A neutron activation system is under development to measure neutron fluence on the first wall and to evaluate total fusion power from ITER plasma. This system utilizes the method of counting gamma radiation from the metal sample irradiated by the neutron flux at the irradiation end near the plasma. Evaluation of the operational activity of the sample, which has been induced during ITER operation, is necessary to determine sample material, mass, and the appropriate irradiation time. Neutronics calculations are performed to evaluate operational activity of the sample. Activation of the sample according to the irradiation time for various sample materials such as Si, Al, Ti, Fe, Nb, and Cu is calculated assuming the samples are irradiated at the midplane inboard region where the neutron flux is one of the strongest.
Keywords :
Tokamak devices; aluminium; copper; fusion reactor materials; gamma-ray effects; iron; neutron effects; niobium; plasma diagnostics; plasma-wall interactions; silicon; titanium; Al; Cu; Fe; ITER diagnostic neutron activation system; Nb; Si; Ti; fusion power; gamma radiation; midplane inboard region; neutron flux; neutron irradiation; neutronics calculations; operational activity evaluation; Gamma rays; Libraries; Neutrons; Nuclear and plasma sciences; Plasma materials processing; Plasma measurements; Power measurement; Solid modeling; Thermal loading; Time measurement; FISPACT Alite; ITER; MCNP; neutron activation system; sample activity;
Conference_Titel :
Fusion Engineering, 2009. SOFE 2009. 23rd IEEE/NPSS Symposium on
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4244-2635-5
Electronic_ISBN :
978-1-4244-2636-2
DOI :
10.1109/FUSION.2009.5226469
