Sunpower Inc. CryoTel
MT Operating Instructions version 4
8
IV. Mechanical Mounting
The CryoTel
TM
MT has a thick metal end plate on the out end of the pressure vessel nearest
the passive vibration absorber. M4 threaded holes on the outer diameter of the transition and
end plate are designed for attachment of the cooler to an external mechanical structure for
testing or integration into the application. These can be seen in Figure 3.
On the face of the external copper ring that rejects heat from the cooler is a stainless steel plate.
The plate has four M3 threaded holes that can be used for attaching a removable NW50 or
customer specified vacuum flange (see Figure 4). A vacuum flange can also be welded to this
plate, but must be done with a low energy weld such as plasma or micro TIG. It is
recommended that, if needed, the customer allow Sunpower to perform the welding operation.
The mechanical structure including the cryostat attachment plate, heat rejection copper, and
transition have been designed to allow mounting the entire assembly by the cryostat and
cantilevering the cooler and vibration absorber from the cryostat in a given application.
V. Attachment of Heat Load to Cold Finger
The copper cold tip at the end of the cold finger has four M3 threaded holes that can be used for
mounting equipment to the cold tip for applications or tests (see Figure 5). The application of
force to the cold tip must be handled with care and in accordance with these not-to-exceed
limits:
Cantilevered force, cooler not in operation: do not exceed a cantilevered force
on the cold finger (static or shock) > 100 N (10.20kg).
Cantilevered force, cooler in operation: do not permit the heat load apparatus to
deliver force to the cold finger (static or shock) > 30 N (3.05 kg)
Vertical loading: do not exceed a pure tension or compression load > 300 N
(30.50 kg)
Torque, cold finger: do not exceed a load >16 N*m (142 in*lbs)
Threaded
Mounting
Holes
2 of 4 M3
Threaded
holes
Figure 3: Pressure Vessel Mounting Holes
Figure 4: Weld Flange Holes
