Cyclotron Hill Sector Peripheral Edge Geometry
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Solution Overview
Problem
Isochronous sector-focused cyclotrons face challenges in ensuring that the optical properties of extracted particle beams are consistent across multiple extraction points within the same hill sector, particularly in maintaining energy and focusing characteristics.
Innovation Solution
The design incorporates magnet poles with specific geometries, including upper peripheral edges featuring an arc of circle with a center offset from the central axis, ensuring that the magnetic field variations create a consistent path for particle beams across multiple extraction points, with the arc of circle's radius not exceeding 85% of the distance from the central axis to the midpoint of the upper peripheral edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple extraction points are provided within the same hill sector, then service continuity and versatility are improved, but the optical properties of extracted beams become inconsistent
Solution Approach 1:
The patent applies local quality by creating a specific geometric configuration at the peripheral edge of the hill sector. The circular arc with radius Rh ≤ 0.85Lh is designed to produce a localized magnetic field distribution that ensures consistent optical properties (energy, focusing) for particle beams extracted at different points within the hill sector, while maintaining the ability to use multiple extraction points for versatility and service continuity.
2Reliability
If the peripheral edge geometry is modified to ensure consistent optical properties, then beam quality is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs spheroidality by defining the peripheral edge of the hill sector as a circular arc rather than a straight line or complex curve. This curved geometry, with radius Rh not exceeding 0.85Lh, creates the necessary magnetic field distribution for consistent beam optical properties while remaining manufacturable using standard machining techniques for circular arcs.
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 design ensures that the optical properties of the particle beams extracted from different points within a hill sector are nearly independent of the extraction point's position, maintaining consistent energy and focusing characteristics, thereby enhancing the reliability and versatility of the cyclotron.
Implementation Method 1
A cyclotron comprises several elements including an injection system, a radiofrequency (RF) accelerating system for accelerating the charged particles, a magnetic system for guiding the accelerated particles along a precise path
Implementation Method 2
this particle beam is sequentially and repetitively accelerated by the RF accelerating system and guided outwards along a spiral path
Implementation Method 3
The upper peripheral edge of a hill sector comprises an arc of circle which centre is offset with respect to the central axis, and which radius, Rh, is not more than 85% of a distance, Lh, from the central axis to a midpoint of the upper peripheral edge
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 peripheral edge of a hill sector comprises an arc of circle which centre is offset with respect to the central axis, and which radius, Rh, is not more than 85% of a distance, Lh, from the central axis to a midpoint of the upper peripheral edge, which is equidistant to the first and second upper distal ends (Rh / Lh ≤85%).