Superconducting Magnet Control System for Quench Prevention
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Solution Overview
Problem
Superconducting magnets in MRI devices require frequent maintenance, especially due to limited ride-through capabilities during power outages or cryocooler failures, necessitating on-site intervention to prevent quenching, which increases costs and downtime.
Innovation Solution
An automated control system for superconducting magnets that includes a controller monitoring magnet parameters, allowing for remote and automatic ramp-down and ramp-up operations, using a discharge module with a resistor and diode stack to manage current and prevent quenching, and retractable current leads for minimizing heat leak and facilitating remote operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual ramp-down and ramp-up operations are performed by field engineers, then the magnet can be safely controlled during outages, but maintenance costs and downtime increase
Solution Approach 1:
The control system enables self-service operation by automatically monitoring magnet temperature and other parameters, detecting when ramp-down is required, and executing the ramp-down and ramp-up sequences without field engineer intervention. The system serves itself by managing its own protection and recovery operations.
Solution Approach 2:
The system continuously monitors magnet temperature and other critical parameters, using this feedback to automatically trigger ramp-down when thresholds are exceeded and execute ramp-up when conditions permit. This closed-loop control ensures safe operation while eliminating manual intervention requirements.
2Reliability
If the magnet is manually monitored and controlled, then quenching can be prevented, but operational complexity and cost increase
Solution Approach 1:
The control system automatically monitors its own state through temperature and parameter sensors, detects quench conditions, and executes protection sequences without external intervention. This self-service capability maintains reliability while managing complexity through automation rather than human operation.
Solution Approach 2:
The system is pre-configured with threshold values and control sequences that are established before outages occur. When anomalies are detected, the pre-programmed ramp-down and ramp-up sequences execute automatically, eliminating the need for real-time manual decision-making and reducing operational complexity.
3Reliability
If field engineers perform periodic maintenance manually, then the magnet can be maintained, but operating costs increase
Solution Approach 1:
The control system performs self-diagnosis and self-maintenance by automatically monitoring magnet parameters, detecting anomalies, and executing correction sequences such as re-shimming and cryocooler control adjustments. This eliminates the need for expensive field engineer visits for routine maintenance.
Solution Approach 2:
Continuous monitoring of magnet temperature, current, and other parameters provides feedback that triggers automatic maintenance sequences. The system detects when re-shimming or cryocooler intervention is needed and executes these operations automatically, reducing operating costs by eliminating manual service calls.
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
The system enables remote monitoring and control of superconducting magnets, preventing quenching during outages and reducing maintenance costs by allowing automatic discharge and re-ramping, thus reducing downtime and operational expenses.
Implementation Method 1
a discharge module electrically coupled to a second end of the lead... automatically initiating a controlled ramp-down of the magnet... the discharge module including at least one a resistor and diode stack
Data Source
AI summary
A control system for a superconducting magnet includes an electrically conductive lead having a first end electrically coupled to the superconducting magnet, at least one of a main power supply, a shimming power supply and a discharge module electrically coupled to a second end of the lead, and a controller in communication with the at least one of the main power supply, the shimming power supply and the discharge module. The controller is configured to monitor at least one magnet parameter value indicative of a state of the superconducting magnet and to automatically control operation of the at least one of the main power supply, the shimming power supply and the discharge module when the magnet parameter value crosses a predetermined threshold value prior to a quench.