Cryostat Thermal Switch Design for Multi-Stage Temperature Control
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Solution Overview
Problem
Cryogenic systems face challenges in efficiently managing thermal profiles within a common vacuum space, leading to heat loads and radiative loads that affect the operation of cryostats, limiting their ability to maintain precise temperatures for evaluating samples or devices under cryogenic conditions.
Innovation Solution
The implementation of a cryostat with multiple thermal stages and a thermal switch that provides a switchable thermal path between intermediate and adjacent stages, allowing for flexible modification of the thermal profile by coupling or decoupling the thermal stages using a helium medium or superconducting materials, thereby optimizing cooling capacity and temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple thermal stages are placed within a common vacuum space, then the cryostat can accommodate varying evaluation conditions and enhance cooling efficiency, but heat loads and radiative loads increase, affecting temperature precision
Solution Approach 1:
The cryostat is divided into multiple thermally isolated stages (4-K stage, Still stage, intermediate thermal stage, Cold Plate stage) within a common vacuum space. Each stage is mechanically coupled via support rods but thermally isolated, allowing independent temperature control while reducing mutual thermal interference and radiative heat loads between stages.
Solution Approach 2:
A thermal switch is introduced as an intermediary component between the intermediate thermal stage and adjacent thermal stages. This thermal switch acts as a controllable thermal pathway that can be activated or deactivated to manage heat flow, allowing precise control over thermal coupling while minimizing unwanted heat loads.
2Stability of the object's composition
If thermal stages are mechanically coupled via support rods, then structural stability is maintained, but thermal conduction through the support rods creates unwanted heat paths
Solution Approach 1:
The support rods are designed with varying thermal conductivities at different locations. The rods provide mechanical support while having minimized thermal conduction properties, creating a structural pathway that is stable mechanically but thermally isolated, thus reducing unwanted heat conduction between stages.
3Measurement precision
If a thermal switch is used to provide switchable thermal paths, then temperature precision and cooling capacity are optimized, but device complexity increases
Solution Approach 1:
The thermal switch operates by changing physical parameters (such as phase state or electrical resistance) to control thermal conductivity. This allows the thermal pathway to be dynamically adjusted between conducting and blocking states, enabling precise temperature control without requiring complex mechanical moving parts.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables cryostats to maintain precise temperatures across multiple cryogenic systems within a common vacuum space, enhancing cooling efficiency and accommodating varying evaluation conditions by dynamically adjusting the thermal profile, thus improving the evaluation of samples or devices under cryogenic conditions.
Implementation Method 1
coupling or decoupling the thermal stages using a helium medium or superconducting materials
Implementation Method 2
coupling or decoupling the thermal stages using a helium medium or superconducting materials
Implementation Method 3
The intermediate thermal stage can be directly coupled mechanically to the Still stage via a support rod
Implementation Method 4
Multiple cryogenic systems sectioned within a common vacuum space
Data Source
AI summary
Techniques facilitating multiple cryogenic systems sectioned within a common vacuum space are provided. In one example, a cryostat can comprise a plurality of thermal stages and a thermal switch. The plurality of thermal stages can intervene between a 4-Kelvin (K) stage and a Cold Plate stage. The plurality of thermal stages can include a Still stage and an intermediate thermal stage that can be directly coupled mechanically to the Still stage via a support rod. The thermal switch can be coupled to the intermediate thermal stage and an adjacent thermal stage. The thermal switch can facilitate modifying a thermal profile of the cryostat by providing a switchable thermal path between the intermediate thermal stage and the adjacent thermal stage.