Adiabatic demagnetization apparatus

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Solution Overview

Problem

Conventional adiabatic demagnetization systems operate in single-shot mode, achieving low temperatures only briefly and not stably, limiting their applicability in applications requiring long-term, stable sub-Kelvin temperatures.

Innovation Solution

A method of controlling adiabatic demagnetization apparatuses by varying operational parameters such as cycling frequency, thermal switch modes, and temperature ranges in response to heat loads, allowing continuous and variable temperature maintenance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If conventional single-shot adiabatic demagnetization mode is used, then low temperatures can be achieved, but the temperatures cannot be maintained stably for a long time

Engineering Contradiction:

Improvelow temperature achievementVSAvoidtemperature maintenance duration

Core Design Contradiction:

TemperatureVSDuration of action of stationary object

Solution Approach 1:

The patent implements periodic cycling of the adiabatic demagnetization units between magnetized and demagnetized states. By repeatedly cycling the ADR units, the system maintains continuous cooling capability and stable low temperatures over extended periods, resolving the limitation of single-shot mode where temperatures could only be achieved briefly.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent ensures continuous cooling operation by having multiple ADR units cycle in coordinated sequences. At least one ADR unit is continuously active to maintain low temperatures, eliminating the idle periods inherent in single-shot operation and providing uninterrupted cooling for extended durations.

Inventive Principle:

Principle #20Continuity of useful action

2Productivity

If cycling frequency of adiabatic demagnetization units is increased, then cooling capacity is improved, but thermal switching noise increases

Engineering Contradiction:

Improvecooling capacityVSAvoidthermal switching noise

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent implements dynamic adjustment of cycling frequency based on operational requirements. The control system varies the cycling frequency of ADR units to optimize cooling capacity while maintaining noise levels within acceptable ranges. This dynamic control allows the system to adapt cycling rates to match actual cooling demands rather than operating at fixed high frequencies.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent uses multiple ADR units where only the necessary number are cycled at any given time to meet cooling demands. By distributing the cooling load across multiple units and cycling them in sequences, the system achieves required cooling capacity without all units operating at maximum cycling frequencies simultaneously, thereby reducing overall thermal switching noise.

Inventive Principle:

Principle #16Partial or excessive action

3Adaptability or versatility

If multiple thermal switches are operated frequently, then temperature control flexibility is improved, but heat switch lifetime is reduced

Engineering Contradiction:

Improvetemperature control flexibilityVSAvoidheat switch lifetime

Core Design Contradiction:

Adaptability or versatilityVSDuration of action of stationary object

Solution Approach 1:

The patent divides the thermal switching function across multiple ADR units, each with its own thermal switches. By segmenting the overall cooling task into multiple independent units that cycle in sequences, the system maintains temperature control flexibility while distributing the mechanical stress and wear on individual thermal switches, thereby extending their operational lifetime.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent ensures continuous temperature control capability by having multiple ADR units operate in coordinated sequences. When one unit is cycling its thermal switches, other units are active, maintaining continuous cooling without requiring frequent switching of any single thermal switch. This continuous operation reduces the cumulative wear on individual thermal switches while preserving overall system flexibility.

Inventive Principle:

Principle #20Continuity of useful action

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 stable, continuous low-temperature operation in the sub-Kelvin range, reducing thermal switching noise and extending heat switch lifetime, and adapting to varying heat loads.

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.

Methodology Applied

Scientific EffectMagneto-caloric effect: Magnetocaloric Effect

Implementation Method 2

operating a plurality of thermal switches of the adiabatic demagnetization apparatus in a first switching mode if a first target temperature is set and/or a first heat load is applied

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS20250369660A1Adiabatic demagnetization apparatus

Publication Date: 2025.12.04 KIUTRA GMBH

AI summary

The present disclosure is to a method of controlling an adiabatic demagnetization apparatus. The method includes varying at least operation parameter of the adiabatic demagnetization apparatus.