Continuously Wound Solenoid Coil with Final Correction for Generating a Homogeneous Magnetic Field in the Interior of the Coil and Associated Optimization Method

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This invention describes a new kind of solenoid (coil) for generating a highly homogeneous magnetic field inside its interior. Instead of using additional correction coils to compensate for imperfections at the coil's edges, the coil is wound continuously with its diameter gradually changing along its length. An advanced optimization method is also proposed, where simulations determine the best coil shape to achieve optimal magnetic field homogeneity over a larger region. This approach simplifies construction, reduces sensitivity to manufacturing errors, and eliminates the need for separate correction coils and their complex wiring.

Use CasesContent extracted from patent full text and abstract with AI.

• Magnetic Resonance Imaging (MRI) systems, where very homogeneous magnetic fields are required for image quality.
• Particle accelerators, particularly for polarizing solid targets in nuclear physics experiments.
• Scientific instruments needing precise and stable magnetic fields for measurements or experiments.
• Analytical equipment in chemistry or biophysics requiring a uniform magnetic environment.
• Quantum computing hardware, where stable magnetic fields are essential for qubit operation.
• Industrial applications where material testing or processing depends on a controlled, highly uniform magnetic field.

BenefitsContent extracted from patent full text and abstract with AI.

• Produces a highly uniform (homogeneous) magnetic field in the sample chamber, improving measurement accuracy or imaging quality.
• Simplifies the overall design by distributing correction throughout the coil itself, removing the need for separate correction coils and their complex electrical feeds.
• Reduces sensitivity to mechanical imperfections, allowing for relaxed manufacturing tolerances and more robust construction.
• Enables optimization for a larger 'volume of interest' due to advanced simulation-based design, thus increasing usable sample size or improving system flexibility.
• Potentially reduces space and heat load because of fewer electrical connections (wires), which is especially valuable in constrained environments like cryostats.
• Can enable better performance within smaller devices, or allow larger usable areas for given device sizes.

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Patent Abstract

The invention relates to an apparatus for generating a homogeneous magnetic field and to an optimization method for magnetic fields in a sample space, which method provides specifications for producing such an apparatus. The apparatus comprises at least one field coil for generating the magnetic field and is characterized in that the turns of the field coil are continuously wound around the sample space and the turn diameter of the field coil continuously changes at least in a subarea of the field coil along the longitudinal axis of the sample space. In this case, the correction of inhomogeneities in the magnetic field which are caused by the finite length of the field coil is distributed over the entire field coil. The apparatus can thus be implemented in a simpler and more precise manner than with the correction coils used to correct inhomogeneities according to the prior art. Instead of the previous series expansion of the magnetic field, the method for optimizing the magnetic field uses a quality function in conjunction with a simulation of the magnetic field on the basis of the optimization parameters. This can be used in a larger volume than the series expansion.