Subjects: Nuclear Science and Technology >> Nuclear Science and Technology submitted time 2024-01-26
Abstract： Due to its good economy and applicability, high-power thyristor device is widely used in power supply systems of large fusion devices. The high-dose neutrons produced by Deuterium-Tritium (D-T) fusion reactions will irradiate the thyristor for a long time, which will lead to the change of the electrical characteristics of the thyristor, and may eventually cause irreversible damage. In this paper, the thyristor switch of the commutation circuit in Quench Protection System (QPS) of fusion device is regard as the study object. The relationship between the internal physical structure and the external electrical parameters of irradiated thyristor is established. Then, a series of targeted thyristor physical simulations and neutron irradiation experiments are carried out to verify the correctness of the theoretical analysis. In addition, the effect of irradiated thyristor electrical characteristic changes on the whole QPS is studied by accurate simulation, which provides valuable guidance for the maintenance and renovation of QPS.
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