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Flexible Thermal Strap for Cryogenic Applications

Presentation #319.08 in the session Future Missions, Instrumentations and Facilities - Part 2 (Oral Presentation)

Published onOct 23, 2023
Flexible Thermal Strap for Cryogenic Applications

In cryogenics, working together with cryocoolers, the thermal straps are the critical thermal element, since they thermally link the instrument with the cold source. In optical elements that work at cryogenic temperatures, the thermal path, and therefore the straps, must isolate them from the vibrations of the cryocoolers. Consequently, its stiffness is a characteristic to consider in the design.

There are cryogenics special cases (e.g., Advanced Telescope for High - ENergy Astrophysics, ESA), in which some element are resonant with the low frequency range of the cryocoolers, and its dissipation can break the superconducting state of the sensors, the basis of its functioning.

Damping methods are important design constraints in order to mitigate vibration transmission from cryocoolers, sometimes it is still necessary to incorporate an external mechanical isolation mounting subsystem that will further attenuate coupling of mechanical disturbances into sensitive space instruments or optical systems.

Strap flexibility, or stiffness, is often important to determine the mechanical impact the strap will have on interfacing components and can be critical when evaluating the performance of a thermal strap. This work describes a prototype design, its resistance testing and thermal conductivity measurements of a new design of flexible copper thermal strap that will be used in a 4 K ground test cryostat. This ground test cryostat facility will be designed and manufactured at INTA.

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