Speaker
Description
In the design of a cryostat, the characterization of their cryocoolers is critical for vibration-sensitive applications. These components are used for achieving and maintaining low temperatures. In this work, the characterization of the PT410 pulse tube cryoocoler through modal and microvibration testing has been conducted.
Modal testing was conducted to examine the natural frequencies and vibration modes of the cold head. Additionally, microvibration testing was performed to determine the interface forces caused by the operation of the cryocooler on the mechanical mounting interface and the accelerations induced on the thermal interface of their cold stages.
The first bending modes of the cryocooler have been determined by the modal test. The forces are measured directly by triaxial load cells and the accelerations of the different stages of the cryocooler are obtained using accelerometers.
The characterization has been performed in a test bench, mechanically designed for accurate measurements. Taking into account that the cryocooler cold head is supplied by a helium flow pulse, this gives one source of vibration that must be controlled, an additional support was implemented for the supply line elements.
In short, this study provides a precise measurement of the dynamic characteristics and mechanical stability of the PT410 cold head. The findings are relevant for the design and development of cryogenic systems where vibrations are critical.
This work was supported by the grants PID2020-115325GB-C31**
Keywords: cryogenics, cold head, pulse tube, microvibrations, testing, modal**
| Submitters Country | España |
|---|
