Neutronics assessment for the Thailand tokamak upgrade

Shielding configuration studies for the fusion plasma experiment of the Thailand tokamak upgrade are presented in this work. The neutron rate of 10¹⁴ n/s of DT fusion is determined to assess the next step operation in phase II of the Thailand tokamak upgrade in the future. In order to optimize the materials and dimensions of the shielding, a series of MCNP simulation was performed to assess the neutron streaming in order to enhance understanding of neutron and gamma transport in the plasma torus, hall and the pathways shielding. Effect of three commonly available concrete composition (ordinary concrete, barite concrete and boron frits-baryte concrete) have been investigated as a torus wall shielding and entrance maze. Four orders of magnitude of fast neutron flux reduction was observed at outside torus hall. The thermal neutron was significantly reduced using the labyrinth structure. The conceptual design of the biological radiation shielding is assessed and presented. This study provides support for the future neutron and gamma radiation safety at the Thailand tokamak upgrade facility. (author)