Gravitational Wave Group
CLIK Refrigerator Cooling Ability
Cryostat
The cryostat in CLIK is cooled by only thermal conduction
with a GM refrigerator. The 1st head and the 2nd of GM
are connected with a 40K and a 4 K radiation shield, respectively.
Each radiation shield is covered with aluminized multi-layer film.
To isolate the vibration from the GM head, the soft structure is
used between the 4K shield inside the chamber and the 2nd head.
Cryostat Structure
Cooling Speed
Cryostat is cooled to about 9 K for 3.5 days and to 7 K for 9 days
if there is nothing inside. The designed max heat load inside is 700 [mW].