Operation stability study for a large-scale superconducting magnet is of particular importance to protect the magnet from permanent damage. Especially, for a fusion magnet, severe heat load by AC loss needs to be effectively removed during operation to achieve required temperature margin. A unique feature of KSTAR PF (poloidal field) magnet is that all the liquid cryogen inlets and outlets of PF1~4UL (PF upper and lower) coils are located at high field region. Therefore, major heat loads are localized both at the inlets and outlets, so that a drastically reduced or even no temporal cryogen flow is frequently observed at the inlets of PF1~4UL coils. This kind of temporal blockage of cryogenic loop can seriously affect the thermos-hydraulic analysis of a superconducting magnet system. As a preliminary study on this issue, we discussed thermos-hydraulic analysis results of the KSTAR PF cryogenic loop by using the SUPERMAGNET code. The numerical simulations were also compared to empirical results.
|Submitters Country||Korea republic of|