Cyclotron Pole Insert for Magnetic Field Fine Tuning
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Solution Overview
Problem
Existing isochronous sector-focused cyclotrons face challenges in achieving precise and cost-effective fine tuning of the magnetic field at hill gap portions due to manufacturing defects and inhomogeneities in magnet poles, requiring iterative corrections that are time-consuming and cumbersome.
Innovation Solution
The design incorporates a magnet pole with recesses for reversible pole inserts, allowing for easy access and precise adjustment of the magnetic field by positioning the inserts on the upper surface away from lateral edges, facilitating direct removal, machining, and reinsertion, thereby simplifying the process of achieving target magnetic field properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lateral pole inserts are used for fine tuning the magnetic field, then the magnetic field precision is improved, but the complexity of iterative corrections increases
Solution Approach 1:
The magnet pole is segmented into a main body and a separate adjustable insert portion. The insert can be removed, machined, and repositioned independently from the main pole structure, allowing iterative corrections to be performed on just the insert rather than the entire pole assembly. This segmentation simplifies the complexity of iterative corrections while maintaining magnetic field precision.
Solution Approach 2:
The pole insert is designed to be dynamically adjustable through removal, machining, and repositioning operations. This dynamic capability allows the magnetic field to be fine-tuned iteratively by modifying the insert geometry, thereby achieving precise magnetic field control without permanently altering the main pole structure.
2Manufacturing precision
If lateral pole inserts are used for fine tuning the magnetic field, then the magnetic field precision is improved, but the time required for corrections increases
Solution Approach 1:
By segmenting the pole into a main body and a separate insert, the correction process is accelerated. Only the small insert portion needs to be removed, machined, and reinstalled during each iterative correction cycle, rather than working with the entire large pole structure. This significantly reduces the time required for each correction iteration while maintaining precision.
Solution Approach 2:
Instead of correcting the entire pole structure, only the necessary partial portion (the insert) is modified. This partial action approach achieves the required magnetic field precision with minimal time investment by focusing corrections only on the critical insert region rather than the whole pole assembly.
3Ease of operation
If pole inserts are positioned on the upper surface away from lateral edges, then the ease of access for machining is improved, but the structural integrity may be compromised
Solution Approach 1:
The pole structure is segmented such that the insert is a separate component positioned on the upper surface away from lateral edges. This segmentation allows easy access for machining the insert without compromising the main pole's structural integrity, as the insert can be independently removed and reinstalled without affecting the core structural elements.
Solution Approach 2:
The insert is extracted as a separate removable component from the main pole body. By taking out this portion as an independent element that can be positioned on the upper surface away from lateral edges, the design enables easy machining access while the main pole structure retains its full structural integrity without being weakened by edge modifications.
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
This approach significantly reduces the complexity and time required for fine-tuning the magnetic field, enabling more efficient production of cyclotrons that closely match predicted performance, resulting in cost-effective and accurate particle beam focusing.
Implementation Method 1
The magnetic field is generated in the gap defined between two magnet poles by two solenoid coils, 14, wound around these poles. The magnetic field guides and focuses the beam of charged particles along the spiral path
Implementation Method 2
The magnetic field is generated in the gap defined between two magnet poles by two solenoid coils, 14, wound around these poles
Data Source
Figure 1(a)~1(b)
Figure 2~3
Figure 4
AI summary
A magnet pole for an isochronous sector-focused cyclotron comprising hill and valley sectors alternatively distributed around a central axis, Z, each hill sector comprises an upper surface bounded by four edges: an upper peripheral edge, an upper central edge, a first and a second upper lateral edges. The upper surface of at least one hill sector further comprises: a recess extending over a length between a proximal end and a distal end along a longitudinal axis intersecting the upper peripheral edge and the upper central edge; said recess being separate from the first and second upper lateral edges over at least 80% of its length, and a pole insert having a geometry fitting in said recess and being positioned in, and reversibly coupled to said recess.