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The burn characteristics are examined of an inertially confined advanced fuel pellet ignited by D-T burn, i.e. a D-T ignitor/D-D fuel and a D-T ignitor/D-3 He fuel pellet. With the help of numerical simulations of a bare target model, conditions are derived for the pellet compression needed in an advanced fuel fusion reactor. It is found that a D-T/D-D pellet having a total pR value of ~ 13 g-cm" 2 and an ignitor with a pR of ~ 5 g-cm" 2 is required for a reactor operating without tritium breeding blanket. A scaling chart of the fuel burnup and the internal tritium breeding ratio is given, and a condition to be imposed on the ignitor for efficient burn is discussed.

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Bum simulations have been carried out for the DT ignitor/DD fuel pellet model by using a hydrodynamic code including neutron transport. The results showed that neutron heating has large effects on the bum performance, for instance the fusion yield and the internal tritium breeding ratio. The DD burning could be sustained by neutron heating and thus sufficient tritium could be bred by using one of the branches of the DD reaction, D + D -• p + T. Furthermore, several treatments for neutron transport were compared. It was found that the treatment of the anisotropy of neutron scattering has a larger influence on the bum performance than the treatment of the time dependence of neutron transport. Finally a compressed state of the pellet was proposed as a candidate for the advanced fuel ICF reactor TAKANAWA-I.

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