| Irfu-10-110
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| Unsteady heat dissipation in accelerator superconducting cables insulated with polyimide insulation in normal and supercritical helium |
| S. Pietrowicz, N. Kimura, B. Baudouy, A. Yamamoto |
| In order to predict the thermal characteristics of superconducting cables insulated with polyimide tapes dedicated for accelerator magnets, several unsteady heat transfer experiments were performed in different thermodynamic helium conditions. An experimental mock-up reproducing the heat transfer configuration of a stack of insulated Rutherford cables was used. Unsteady heat dissipations were performed at normal (T = 4.23 K and p = 1 bar) and supercritical helium conditions (T = 4.23 K and p = 2.0 to 3.75 bar) and temperatures in the cables were recorded. The values of localized heat load changed in a wide range from 0.1 kJ/m3 per pulse up to 1.122 MJ/m3 per pulse. The evolutions of temperature rise as function of time for short and “infinite” pulse duration representing time limited heat dissipation and a quench event are presented. |
