Radial superconducting uniform field coil with round corner and design method thereof

Abstract

The invention provides a radial superconducting uniform field coil with a round corner and a design method thereof. The superconducting uniform field coil is formed by a saddle-shaped coil in a basicshape with round corner connection; and a position between an axial line section and a circular arc line section of the saddle type coil is smoothly bent and folded into round corner connection. The design method of the radial superconducting uniform field coil comprises the following steps of 1, determining the design requirements of the uniform field coil, and using the requirements as initial parameters of the uniform field coil to be input; 2, setting a target magnetic field; restraining the dimension range of the saddle-shaped coil; using the coil area as the minimum optimization objective; introducing constraint conditions; and building a nonlinear optimization model; 3, specifying the saddle-shaped coil current density, the harmonic component order and the round corner radius for optimization solution, and obtaining the coil position coordinate and circular arc span; and 4, judging whether the coil parameter obtained through nonlinear planning meets the design requirements or not; if so, outputting the parameter of the superconducting coil meeting the design requirements; and if not, executing the step 3 again.

Description

technical field [0001] The invention relates to a radial superconducting shim coil and a design method thereof. Background technique [0002] Magnetic resonance imaging technology has become an important imaging tool in the field of medicine and scientific research because of its excellent imaging performance and no radiation hazards. In order to present clear and precise tissue structure information for magnetic resonance imaging equipment, a highly uniform main magnetic field is required, so that the atomic nuclei placed in the uniform main magnetic field environment will precess at the same frequency. However, the production and assembly errors of the magnetic resonance imaging magnet will inevitably be introduced after processing, and the uniformity of the magnetic field will be destroyed, making the imaging quality deteriorate, and even the image cannot be formed. As a remedial measure for magnetic field uniformity, shim coils are used to offset the inhomogeneous harmo...

AI Technical Summary

Problems solved by technology

When the right-angle saddle coil is wound, it is inevitable to form an arc connection at the junction of the circumferential arc and the axial loop, so that the actual wound coil structure deviates from the original design structure, resulting in magnetic field errors, especially for small superconducting magnets. The shim coil itself is also smaller, and the magnetic field deviation caused by this winding error will be more obvious

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