Adiabatic demagnetization apparatus
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Solution Overview
Problem
Conventional adiabatic demagnetization refrigerator (ADR) systems operate in single-shot mode, achieving low temperatures only for a short time and not maintaining them stably for longer periods, which is inadequate for many applications requiring continuous and stable sub-Kelvin temperatures.
Innovation Solution
A method of controlling an adiabatic demagnetization apparatus by varying operational parameters such as cycling frequency, switching modes of thermal switches, and temperature ranges of adiabatic demagnetization units, allowing for continuous and variable achievement of low temperatures in the sub-Kelvin range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional ADR systems operate in single-shot mode, then low temperatures can be achieved, but the temperatures cannot be maintained stably for longer periods
Solution Approach 1:
The patent implements periodic cycling of the ADR system between magnetization and demagnetization states. The control method varies operational parameters including cycling frequency between 0.001 Hz and 10 Hz, allowing the system to repeatedly achieve and maintain low temperatures through periodic adiabatic demagnetization cycles rather than single-shot operation.
Solution Approach 2:
The system dynamically adjusts operational parameters such as cycling frequency, maximum cycling temperature, and minimum cycling temperature based on target temperature requirements and heat load conditions. This dynamic control enables continuous adaptation to maintain stable low temperatures over extended periods while optimizing cooling efficiency.
2Stability of the object's composition
If cycling frequency is increased to maintain low temperatures, then temperature stability improves, but thermal switching noise increases
Solution Approach 1:
The patent employs parameter changes by varying cycling frequency within the range of 0.001 Hz to 10 Hz, adjusting maximum and minimum cycling temperatures, and modifying thermal switch operating characteristics. These parameter adjustments allow optimization of the balance between temperature stability and thermal switching noise for different application requirements.
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 approach enables the stabilization of target temperatures with high precision and the ability to cope with changes in heat load, reducing thermal switching noise and extending the lifetime of heat switches, thereby achieving continuous low-temperature magnetic cooling.
Implementation Method 1
ADR is based on the magneto-caloric effect. When a medium is magnetized its magnetic moments get aligned and the heat of magnetization is released. Vice versa, if the medium is demagnetized its temperature drops.
Implementation Method 2
cycling at least one adiabatic demagnetization unit of the adiabatic demagnetization apparatus between a first temperature and a second temperature with varying frequency
Data Source
AI summary
The present disclosure is to a method of controlling an adiabatic demagnetization apparatus. The method includes varying at least one operation parameter of the adiabatic demagnetization apparatus.