Cryogenic Analysis Systems With Thermal Switching for Faster Device Exchange
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Solution Overview
Problem
Current cryostat architectures require the entire system to be thermally cycled to exchange a cryogenic device, limiting the exchange time and throughput in quantum device testing due to the thermal engagement of the device and cold source within the same vacuum chamber.
Innovation Solution
A new cryostat architecture with independent thermal and vacuum control of the cryogenic device, allowing it to be exchanged separately from the rest of the system by using a thermal switch to engage/disengage thermal communication between the cryogenic device and the cold source, reducing the thermal cycling to only the device's mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the entire cryostat system is thermally cycled to exchange a cryogenic device, then the device can be exchanged, but the exchange time is excessively long (more than 3 hours) due to the large thermal mass of the cold source and vacuum chamber
Solution Approach 1:
The cryostat system is segmented into independent thermal zones: a stationary cold source in a first vacuum chamber and a movable cryogenic device mount in a second vacuum chamber. This allows the device mount to be thermally cycled independently from the cold source, reducing exchange time from hours to minutes while maintaining system functionality.
Solution Approach 2:
The cryogenic device is extracted from the main vacuum chamber and placed in a separate second vacuum chamber that can be independently thermally cycled. This extraction allows the device to be warmed, vented, and exchanged without affecting the cold source or the first vacuum chamber, dramatically reducing exchange time.
2Temperature
If the cryogenic device is thermally engaged to the cold source via a thermal conduit within the same vacuum chamber, then efficient heat transfer is achieved, but the entire system must be thermally cycled for device exchange
Solution Approach 1:
The thermal pathway is segmented by placing the cold source and device mount in separate vacuum chambers connected by a thermal conduit through a vacuum barrier. This allows the device mount to be thermally disconnected from the cold source during exchange operations, enabling independent thermal cycling of the device without cooling the entire system.
Solution Approach 2:
A thermal switch is introduced as an intermediary component in the thermal conduit between the cold source and device mount. This thermal switch can be opened or closed to control heat flow, allowing the device to be thermally isolated from the cold source during exchange while maintaining efficient thermal coupling during operation.
3Ease of operation
If the cryogenic device and vacuum chamber are vented to atmosphere for device exchange, then device access is enabled, but the cold source loses vacuum and must be re-pumped, adding significant time to the exchange process
Solution Approach 1:
The vacuum system is segmented into two independent vacuum chambers: the first vacuum chamber containing the cold source and the second vacuum chamber containing the device mount. The second chamber can be vented to atmosphere for device exchange without affecting the vacuum in the first chamber, eliminating vacuum re-establishment time while maintaining device accessibility.
Solution Approach 2:
The device exchange operation is extracted to a separate second vacuum chamber that can be independently vented and re-pumped. This allows the main cold source chamber to maintain its vacuum continuously, so when the device chamber is vented for exchange, the cold source remains under vacuum and operational.
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
Enables faster cryogenic device exchange times by thermally cycling only the device, reducing cooldown times by more than 10× compared to conventional systems, thus increasing the number of devices that can be tested in a day.
Implementation Method 1
a first thermal conduit extending from the cold source through the vacuum barrier to the sample mount
Implementation Method 2
the first and second vacuum chambers are separated by a vacuum barrier
Data Source
AI summary
Switch assemblies for a cryogenic device analysis system are provided. The switch assembly can include: a cold source conductive member extending lengthwise to a cold source; and a cryogenic device conductive member extending lengthwise to a cryogenic device and at least partially overlapping at least a portion of the cold source conductive member. Methods for closing a conductive connection between a cold source and a cryogenic device within a cryogenic analysis system are provided. Methods for opening a conductive connection between a cold source and a cryogenic device within a cryogenic analysis system are provided. Cryogenic device analysis systems are also provided.