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Report No.

Application of $$gamma$$ rays from D($$alpha$$,$$gamma$$)$$^{6}$$Li and $$^{19}$$F($$alpha$$,n)$$^{22}$$Na to alpha particle diagnostics

Ochiai, Kentaro; Kubota, Naoyoshi; Taniike, Akira*; Kitamura, Akira*; Kondo, Keitaro*; Nishitani, Takeo

For the density of 3.5-MeV $$alpha$$ particle and the leakage $$alpha$$ particle in D-T plasmas, we propose the observation of 2.186-MeV $$gamma$$-ray produced by D($$alpha$$,$$gamma$$)$$^{6}$$Li reaction and the use of the activation method by $$^{19}$$F($$alpha$$,n)$$^{22}$$Na reaction, respectively. In order to verify these reaction rates, we have carried out the irradiation experiments by means of helium ion bombardment into a deuteride polyethylene and a calcium floride crystal samples. From our experiment, D($$alpha$$,$$gamma$$)$$^{6}$$Li reaction rate is estimated to be 10$$^{13}$$m$$^{-3}$$s$$^{-1}$$in the ITER typical plasma condition. So we obtained good prospect of the $$gamma$$-ray measurement as the confined $$alpha$$ diagnostics by using high efficiency detector. Also, it was found that The number of leakage alpha particles in order of 10$$^{18}$$m$$^{2}$$ could be estimated by the activation method with $$^{19}$$F($$alpha$$,n)$$^{22}$$Na.



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Category:Nuclear Science & Technology



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