Superconductive Coil Module Shaking Coil Screening Current
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Solution Overview
Problem
Second generation high temperature superconductive coils experience a screening current induced magnetic field that weakens the radial magnetic field when charged and discharged, affecting the uniformity of the central magnetic field in nuclear magnetic resonance and magnetic resonance imaging apparatuses, which persists until the superconductive property is lost.
Innovation Solution
A superconductive coil module incorporating a shaking coil that generates an alternating magnetic field parallel to the superconductive wire member to counteract the screening current induced magnetic field, utilizing a voltex shaking effect to maintain the central magnetic field uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a second generation high temperature superconductive coil is charged and discharged, then the superconductive coil can generate radial magnetic field for nuclear magnetic resonance and magnetic resonance imaging, but a screening current induced magnetic field is generated that weakens the radial magnetic field and affects central magnetic field uniformity
Solution Approach 1:
The shaking coil generates an alternating magnetic field in advance to counteract the screening current induced magnetic field before it can significantly degrade the central magnetic field uniformity. This preliminary anti-action prevents the harmful effect rather than correcting it after occurrence.
Solution Approach 2:
The shaking coil applies periodic alternating magnetic field to the superconductive wire member during charging and discharging operations. This periodic action disrupts the screening current formation and eliminates the induced magnetic field that would otherwise persist and degrade field uniformity.
2Adaptability or versatility
If the superconductive coil is repeatedly charged and discharged, then the operational flexibility is improved, but the screening current induced magnetic field accumulates and has increasing effect on the central magnetic field
Solution Approach 1:
The shaking coil applies periodic alternating magnetic field during each charging and discharging cycle to continuously eliminate screening current induced magnetic field. This ensures that even with repeated operations, the central magnetic field uniformity is maintained without cumulative degradation.
Solution Approach 2:
The shaking coil operates continuously during charging and discharging processes to maintain central magnetic field uniformity throughout repeated operations. This continuous action ensures that the beneficial operational flexibility is achieved without compromising field reliability.
3Manufacturing precision
If a shaking coil is added to eliminate screening current induced magnetic field, then the central magnetic field uniformity is improved, but the device complexity increases
Solution Approach 1:
The shaking coil acts as an intermediary component that generates alternating magnetic field to counteract the screening current induced magnetic field. This mediator element enables the elimination of harmful effects without fundamentally redesigning the main superconductive coil structure.
Solution Approach 2:
The shaking coil introduces dynamic alternating magnetic field to counteract the static screening current induced magnetic field. This dynamic approach allows elimination of the harmful field with a relatively simple additional component rather than complex modification of the main coil.
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
Effectively decreases the screening current induced magnetic field, ensuring a uniformly maintained central magnetic field in superconductive apparatuses by fluxing the alternating magnetic field vertically to the screening current induced field, thereby enhancing the operational efficiency of nuclear magnetic resonance and magnetic resonance imaging apparatuses.
Implementation Method 1
The shaking coil is disposed adjacent to the superconductive wire member, and is configured to generate an alternating magnetic field to decrease a magnitude of a screening current induced magnetic field formed in the superconductive wire member
Implementation Method 2
The superconductive coil is configured to generate a magnetic field along a radial direction in case of a charging event
Data Source
AI summary
A superconductive coil module includes a superconductive coil a superconductive coil and a shaking coil. The superconductive coil includes a bobbin having a cylindrical shape, and a superconductive wire member of superconductive property, which surrounds an outer circumferential surface of the bobbin. The superconductive coil is configured to generate a magnetic field along a radial direction in case of a charging event. The shaking coil is disposed adjacent to the superconductive wire member, and is configured to generate an alternating magnetic field to decrease a magnitude of a screening current induced magnetic field formed in the superconductive wire member. Thus, the superconductive coil module includes the shaking coil to decrease the magnitude of a screening current induced magnetic field formed in the superconductive wire member using a voltex shaking effect to maintain a central magnetic field uniform.