New measurements of multilayer insulation at variable cold temperature and elevated residual gas pressure

[摘要] New MLI measurements at the TU Dresden flow type calorimeter have been carried out. Specimens of 20 layer double side aluminized polyester film were tested. A cylindrical cold surface of 0.9 m2is held at the desired cold boundary temperature between approximately 30 K and 300 K. The heat transfer through the MLI is measured by recording the mass flow as well as the inlet and the outlet temperature of the cooling fluid. Measurements at varied cold boundary temperatures have been performed. Moreover the effect of an additional vacuum degradation - as it might occur by decreasing getter material performance in real systems at elevated temperatures - is studied by a controlled inlet of nitrogen gas. Thus the vacuum pressure was varied over a range of 10-7mbar to 10-2mbar. Different cold boundary temperatures between 35 K and 110 K were investigated. Test results for 20 layer MLI are presented.

[发布机构] Technische Universitaet Dresden, Bitzer-Stiftungsprofessur fuer Kaelte-, Kryo- und Kompressorentchnik, Dresden; 01062, Germany^1

[效力级别] 物理学 [学科分类] 材料科学（综合）

[关键词] Boundary temperature;Cold temperatures;Controlled inlet;Elevated temperature;Material performance;Multi-layer insulation;Outlet temperature;Residual gas pressure