Dynamic Magnetic Field Shield for Spacecraft Radiation Protection
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Solution Overview
Problem
Current radiation shielding technologies for spacecraft are inefficient in protecting against high-energy charged particles during solar proton events, particularly due to high power consumption and limited effectiveness in deflecting particles along magnetic field cusps.
Innovation Solution
A dynamic magnetic field shield is generated with ongoing perturbations in magnitude, direction, and structure, controlled by a source to deflect energetic charged particles, using a magnetic field source and controller that maintains fluctuations over specific timescales and power levels, creating a complex magnetic field structure to deflect particles without completing full orbits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a static magnetic field shield is used to protect spacecraft from energetic charged particles, then the spacecraft is shielded from radiation, but the power consumption is high and particles can reach along magnetic field cusps
Solution Approach 1:
The patent applies dynamic perturbation to the magnetic field configuration, transforming a static shield into a dynamically varying one. The controller continuously perturbs the magnetic field parameters (magnitude, direction, or structure) to prevent charged particles from establishing stable drift paths along cusps, thereby maintaining shielding effectiveness while reducing the average power consumption compared to a static high-field configuration
Solution Approach 2:
The patent implements periodic or aperiodic perturbation of the magnetic field at specific timescales (0.001 to 1.0 seconds). This periodic action disrupts the coherent motion of charged particles along magnetic field lines, preventing them from completing full Larmor orbits and reaching the spacecraft, while allowing the system to operate at lower average power levels
2Reliability
If the magnetic field strength is increased to improve particle deflection, then shielding effectiveness improves, but power consumption increases
Solution Approach 1:
The patent changes the temporal parameter of the magnetic field from static to dynamically varying. By introducing time-dependent perturbations in field magnitude, direction, or structure, the system achieves effective particle deflection through cumulative disruptive effects rather than requiring continuously high field strength, thereby reducing power consumption while maintaining shielding effectiveness
3Reliability
If a magnetic field shield is used to protect astronauts and spacecraft, then radiation protection is provided, but the shielded region size must be similar to the Larmor orbit width (several tens to hundreds of kilometres)
Solution Approach 1:
The patent uses dynamic perturbation to enhance the effectiveness of a compact magnetic field shield. By continuously varying the magnetic field parameters on timescales of 0.001 to 1.0 seconds, the system prevents charged particles from completing full Larmor orbits and reaching the spacecraft, enabling effective shielding within a much smaller volume than the static Larmor orbit width would require
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 dynamic magnetic field shield effectively deflects high-energy charged particles, reducing damage to spacecraft by creating a 'mini-magnetosphere' with enhanced plasma density, achieving improved protection with reduced power consumption and increased efficiency.
Implementation Method 1
a magnetic field source, or shield source, arranged to generate a shield magnetic field to protect the spacecraft from energetic charged particles
Implementation Method 2
A controller is provided to cause ongoing perturbation of the shield magnetic field, to thereby increase the effectiveness of the protection
Data Source
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AI summary
A spacecraft (14) is described which uses a magnetic field source (16) to generate a shield magnetic field (18) to protect the spacecraft from energetic charged particles (10). The field may be perturbed to increase the effectiveness of the protection. Injection of material into the shield cavity to enhance the local plasma density may also be used.