Charged Particle Beam Transport with Dynamic Quadrupole Control
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Solution Overview
Problem
Existing charged particle beam transport systems face challenges in maintaining a small beam spot size and achromaticity, especially when scanning over large angles, due to beam energy spread and dispersion, leading to increased beam spot size and suboptimal focal properties.
Innovation Solution
The apparatus includes at least three quadrupole lenses with dynamically adjustable field strength, arranged between a dipole magnet and a scanner, to maintain a small beam spot size and achromaticity across various scanning angles, using a lookup table for field strength adjustments and additional quadrupole lenses for beam direction control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the beam is scanned over large angles, then the coverage area on the target is increased, but the beam spot size becomes too large
Solution Approach 1:
The patent applies dynamic adjustment of quadrupole lens field strengths based on the scanning angle. As the scanner deflects the beam over large angles, the quadrupole lenses dynamically modify their focusing properties to compensate for dispersion effects, maintaining a small beam spot size across the entire scanned area on the target.
Solution Approach 2:
The patent changes the field strength parameters of the quadrupole lenses as a function of the scanning angle. By adjusting these magnetic field parameters in real-time during scanning, the system compensates for energy-dependent dispersion and maintains optimal beam focusing over large angular ranges, thereby keeping the beam spot size small while covering large areas.
2Manufacturing precision
If the field strength of quadrupole lenses is adjusted dynamically, then the beam spot size is maintained small, but the device complexity increases
Solution Approach 1:
The patent pre-calculates and stores the optimal field strength settings for the quadrupole lenses corresponding to different scanning angles. This lookup table approach allows the control system to simply retrieve pre-determined parameters rather than performing complex real-time calculations, thereby maintaining small beam spot sizes while minimizing control system complexity.
3Manufacturing precision
If additional quadrupole lenses are added for beam direction control, then the beam profile characteristics are improved, but the length of the beam line increases
Solution Approach 1:
The patent integrates the additional quadrupole lenses within the existing beam transport line structure, positioning them in available spaces between existing components. This nested arrangement allows the system to achieve improved beam profile characteristics through additional focusing elements while minimizing the overall increase in beam line length.
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 configuration ensures a stable and compact beam transport system capable of scanning over large angles with a small beam spot size, achieving achromaticity and high beam quality, suitable for applications like non-destructive screening and sterilization.
Implementation Method 1
dipole magnets for bending the beam path
Implementation Method 2
quadrupole lenses for adjusting the beam profile or size. Quadrupole lenses can be magnetic or electric devices
Implementation Method 3
quadrupole lenses for adjusting the beam profile or size. Quadrupole lenses can be magnetic or electric devices
Implementation Method 4
The scanner imparts an angular deflection to the charged particle beam
Data Source
AI summary
The present invention is related to an apparatus for transporting a charged particle beam. The apparatus may include means for scanning the charged particle beam on a target, a dipole magnet arranged upstream of the means for scanning, at least three quadrupole lenses arranged between the dipole magnet and the means for scanning and means for adjusting the field strength of said at least three quadrupole lenses in function of the scanning angle of the charged particle beam. The apparatus can be made at least single achromatic.