| 摘要 |
A method is provided of operating a cryogenic cooling system, in which a target region for receiving a sample (50 see fig 2) is cooled by a dilution refrigerator containing an operational fluid. Firstly any operational fluid is removed from the dilution refrigerator. Target apparatus comprising the sample is loaded from a high temperature location to the target region. The target apparatus is then pre-cooled in the target region using a mechanical refrigerator such as a pulse tube refrigerator 2 having 2 stages 3,4. The operational fluid is then supplied to the dilution refrigerator and the dilution refrigerator operated so as to cool the target apparatus in the target location to a lower temperature. A suitable system for performing the method comprises a cryostat 1, a gate valve 7, a docking station 20, a sample carrier (51 see fig 2) and a loading assembly with rods (53,55 see fig 3). The invention allows samples to be changed without the need to warm up the entire system. |
