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The sophisticated cooling system is required for High temperature superconductor (HTS) applications. Especially, HTS rotating machine have to keep the temperature of field poles under 40 K with rotating.
A thermosyphon (TS) cooling system has been employed for HTS rotating machine. TS cooling is based on natural convection of coolant, it doesn’t need mechanical circulator. The feature of a TS cooling system is simple and light weight mechanical composition and the high heat transfer coefficient by utilizing latent heat.
The operating temperature of a TS cooling system is depends on the saturation temperature of coolant. This means an internal pressure affects the performance of a TS cooling system.
In this paper, we focused to the internal pressure for a TS cooling system using a 100 W-grade TS cooling system with rotating part. We carried out the heat load test with variety condenser temperatures with rotating. The internal pressure increase due to the heat load increment and/or condenser temperature increment. Moreover, the rotating is n’t affected for internal pressure. This result shows the internal pressure is in proportion to the difference temperature between condenser temperatures to saturation temperature calculated by internal pressure.
These results provide the cryogenic design with a HTS rotating machine cooled by TS.