Effects of neutron source ratio on nuclear characteristics of D-D fusion reactor blankets and shields.
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概要
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An examination is made of the dependence shown by the nuclear characteristics of the blanket and shield of D-D fusion reactors on S<SUB> DD </SUB> /S<SUB> DT </SUB>, the ratio between the 2.45 MeV neutrons resulting from the D-D reaction and those of 14.06 MeV from the D-T reaction. Also, an estimate is presented of this neutron source ratio S<SUB> DD </SUB> /S<SUB> DT </SUB> for the case of D-D reactors, taken as an example.<BR>It is shown that an increase of S<SUB> DD </SUB> /S<SUB> DT </SUB> reduces the amount of nuclear heating per unit source neutron, while at the same time improving the shielding characteristics. This is accountable to lowering of the energy and penetrability of incident neutrons into the blanket brought about by the increase of SDD/SDT. The value of S<SUB> DD </SUB> /S<SUB> DT </SUB> in a steady state D-D fusioning plasma core is estimated to be 1.461.72 for an ion temperature ranging from 60180 keV. The reductions obtained on <I>H<SUB>T</SUB><SUP>B</SUP></I> (total heating in the blanket), <I>H<SUB>T</SUB><SUP>MG</SUP></I>/<I>H<SUB>T</SUB><SUP>B</SUP></I> (shielding indicator=ratio between total heating in superconducting magnet and that in the blanket) and φ<I><SUP>MG</SUP></I>/φ<SUP>W</SUP> (ratio of fast neutron fluxes between that at the magnet inner surface and that at the first wall inner surface) brought about by increasing S<SUB> DD </SUB> /S<SUB> DT </SUB> from unity to the value cited above do not differ to any appreciable extent, whichever is adopted among the design models considered here, the differences being at most about 10, 15 and 25%, respectively, for these three parameters.<BR>These results would broaden the validity of the conclusion derived in the previous paper for the case of S<SUB> DD </SUB> /S<SUB> DT </SUB>=1.0, that the blanket-shield concept would appear to be the most suitable for D-D fusion reactors.
- 一般社団法人 日本原子力学会の論文
著者
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Ohta Masao
Department Of Nuclear Engineering Kyoto University
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Nakao Yasuyuki
Department Of Applied Quantum Physics And Nuclear Engineering Kyushu University
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Nakashima Hideki
Department Of Advanced Energy Engineering Science Interdisciplinary Graduate School Of Engineering S
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