Superconducting Magnet Demagnetization With External Energy Dissipation
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Solution Overview
Problem
Existing superconducting magnet apparatuses face challenges in rapidly demagnetizing the superconducting magnet without generating excessive heat inside the cryostat, particularly in situations where there is no time margin, such as in accidents or emergencies, due to the limitations of existing cooling systems, and existing technologies have not adequately addressed these challenges, such as the helium shortage and increased costs of refilling, and the inability to refill the liquid helium, which requires a large amount of helium, which is difficult to refill the helium, which requires a large amount of helium, which increases the price and reduces the amount of used liquid helium, which requires a large amount of helium, which increases the cost of helium, which increases the helium, which increases the helium, which reduces the amount of used liquid helium, which reduces the helium, which decreases the temperature rise inside the cryostat, leading to quenching and potential damage to the cryostat.
Innovation Solution
A method for demagnetizing the superconducting magnet apparatus includes a superconducting coil that forms a closed circuit with a persistent current switch, a cryostat, and an external resistance element that is connected in parallel with the superconducting coil, disposed outside the cryostat, and an external power source that is connected in parallel with the superconducting coil, disposed outside the cryostat, and an external power source that is connected in parallel with the superconducting coil, disposed outside the cryostat, and a circuit breaker that is connected in series with the power source that is connected in series with the circuit breaker, and a circuit breaker that is connected in series with the power source that is connected in parallel with the power source that is connected in parallel with the superconducting coil, disposed outside the cryostat, and a circuit breaker that is connected in series with the power source that is connected in series with the power source that is disposed outside the cryostat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the superconducting coil is heated to forcibly quench for urgent demagnetization, then the magnetic field can be rapidly reduced, but excessive heat is generated inside the cryostat causing temperature rise
Solution Approach 1:
The patent extracts the energy dissipation process from the cryostat interior to the exterior by connecting a resistance element outside the cryostat. During demagnetization, the superconducting coil's energy is dissipated through this external resistance, preventing heat generation inside the cryostat while achieving rapid demagnetization.
Solution Approach 2:
The patent introduces a switch as an intermediary component that controls the connection between the superconducting coil and the external resistance element. This switch enables controlled energy transfer from the coil to the external resistance, facilitating safe and rapid demagnetization without direct heating of the coil.
2Temperature
If liquid helium is used for cooling the superconducting coil, then the cooling effect is enhanced, but the cost of helium increases and the amount of helium required is large
Solution Approach 1:
The patent changes the operational parameters of the superconducting coil by controlling the current flow and utilizing the coil's inherent electrical properties. By dissipating energy through external resistance rather than relying on large amounts of liquid helium, the system achieves effective cooling with reduced helium consumption.
3Speed
If the superconducting coil is rapidly demagnetized, then the response time is reduced, but the existing cooling system cannot handle the heat generation
Solution Approach 1:
The patent extracts the heat generation process from the cryostat interior to the exterior by using an external resistance element. This allows rapid demagnetization to occur without overloading the internal cooling system, as the energy dissipation happens outside the cooled environment.
Solution Approach 2:
The patent converts the potentially harmful effect of rapid energy dissipation (heat generation) into a beneficial external process. By directing the energy dissipation to an external resistance element, the system transforms what would be a harmful thermal load into a controlled external process that enables rapid demagnetization without compromising cooling system reliability.
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
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Implementation Method 1
an external resistance element that is connected in parallel with the superconducting coil, is disposed outside the cryostat, and attenuates energy accumulated in the superconducting coil when the superconducting coil is demagnetized
Implementation Method 2
a superconducting current that is not substantially attenuated flows through a closed circuit formed by a superconducting coil to generate a magnetic field
Implementation Method 3
a superconducting coil that forms a superconducting magnet
Implementation Method 4
a heater that heats the superconducting wire material at the time of switching the operation mode
Implementation Method 5
The liquid helium is continuously cooled by a Gifford-MacMahon (GM) refrigerator or the like
Implementation Method 6
The liquid helium filled in the cryostat plays an important role not only in uniformly cooling the superconducting coil and the like
Data Source
AI summary
A superconducting magnet apparatus includes a superconducting coil, a persistent current switch, a cryostat, an external resistance element that attenuates energy accumulated in the superconducting coil when the superconducting coil is demagnetized, an external power supply capable of energizing a reverse current of a persistent current to the superconducting coil, and a circuit breaker capable of freely cutting off energization between the external power supply and the superconducting coil. A method for demagnetizing a superconducting magnet includes causing the reverse current of the persistent current to flow from the external power supply, and switching the persistent current switch to an off-state and switching the circuit breaker to an off-state, and demagnetizing the superconducting magnet by causing a current flowing through the superconducting coil to flow to an external resistance element when the amount of current flowing through the persistent current switch decreases.