Flexible Pulse Tube Collar

LSI B.V. has decreased the vibration levels in a cryostat by 'decoupling' the Pulse Tube Refrigerator (PTR) from the cryostat, while maintaining the thermal (cooling) and vacuum functionalities between these both systems.

This decoupling can be done at two strategic places; the interface between the cold-head of the PTR and the top-plate of the cryostat, the 'collar', is one of them. This stirdy and stiff collar can be replaced by a very flexible Edge Welded Bellow design, so that the PTR vibrations are strongly damped.

LSI B.V. has developed the Flexible Pulse Tube Collar in such a way that no adjustments on the cryostat or PTR cold-head interfaces are necessary. Direct installation on the CF200-1400 and the CF-CS81 cryostat series from Leiden Cryogenics is possible.

It is strongly recommended to also install the Flexible 50K Pulse Tube Heatlink from LSI B.V. By doing this, the maximum mechanical decoupling of the PTR is achieved and both strategic places for the reduction and damping of the PTR vibrations are covered. An extra external frame for suspending the PTR is necessary when installing all three flexible PTR connections (the Collar and the 50K and 3K Heatlinks). However, it is not necessary to install this extra frame when the PTR still has a non-flexible connection at one of the three PTR to cryostat interfaces.

More information about the Flexible Pulse Tube Collar is available here.

  • Flexible Pulse Tube Collar