Cool-down simulation of Nb(sub 3)Al insert after dumping for coil protection

摘要

Nb(sub 3)Al Insert will be fabricated and tested in an Engineering Design Activity (EDA) for the International Thermonuclear Experimental Reactor (ITER). A large amount of heat is generated during dumping because of the induced eddy current of the thick stainless steel plate in which the conductor is embedded. The cool-down simulation of Nb(sub 3)Al Insert after dumping from 46 kA with a decay time constant of 15s and a quench detection time of 2s was performed using the 0-dimentional quench simulation model, thin plate eddy current simulation model and the 2-dimensional cool-down simulation model. The conductor temperature and average temperature of the plate were calculated to be 103 and 21 K, respectively. In addition, the cool-down duration is evaluated to be about 1 h. We can conclude that the cool-down duration is enough short to successively carry out the experiment. (author)