Research Article
Status of the GRANIT Facility
Figure 7
A successful cooldown in 100 hours. The temperature of several areas of the cryostat is constantly monitored. It takes 48 hours from the beginning to start 4He liquefaction, which helps cooling the conversion volume. 48 hours later, the conversion volume is cold enough for keeping liquid 4He. 52 additional hours are needed to fill in this volume. Then, He-II can be cooled down to the temperature of 0.74 K.