抄録
In order to obtain the fundamental data for the application of the forced cooling method to a pulsed magnet, the thermal and hydrodynamic behavior of the supercritical helium in the forced flow cooling superconductor was experimentally investigated with the hollow superconductor (L=6.5m) and the stainless steel tubing (L=3.0m). (1) In case of giving a stepwise heat input to the entire conductor, the transitional stage was observed after heating, which was accompaning the decrease and oscillation of the mass flow rate in the conductor, and as a result, it was found that cooling power of supercritical helium decreased and that the temperature distribution along the conductor had the maximum at the middle of the conductor. (2) In case of repeating pulse heat input, the thermal characteristics of supercritical helium and conductor was influenced by the period of heating. Especially, when the period of heating became short, cooling power of supercritical helium decreased after heating because the thermal characteristics of supercritical helium under pulse heating resembled that under continuous heating.
