Switchable Linear Accelerator Waveguide for Electron Energy Control
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Solution Overview
Problem
Current linear accelerators face challenges in precisely controlling electron energy and beam spot size, leading to energy spread and penetration variations in therapeutic radiation, which affects treatment efficacy in medical applications.
Innovation Solution
A waveguide with individually switchable cells that adjust the supply of electromagnetic radiation, allowing for fine-tuning of electron energies by reducing or eliminating the electromagnetic field in specific cells, enabling precise control over electron energy and beam size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If electromagnetic field is supplied to all cells to accelerate electrons, then electron energy is increased, but electron energy spread increases and control precision deteriorates
Solution Approach 1:
The waveguide is divided into multiple individually controllable cells, each capable of receiving electromagnetic radiation independently. This segmentation allows selective activation of cells to precisely control electron acceleration, reducing energy spread while maintaining total energy gain.
Solution Approach 2:
The system dynamically adjusts the electromagnetic field distribution across different cells based on real-time electron beam conditions. By varying the field strength in individual cells, the system optimizes electron energy control and minimizes energy spread throughout the acceleration process.
2Speed
If electromagnetic field amplitude is increased to accelerate electrons faster, then acceleration speed is improved, but beam spot size increases
Solution Approach 1:
Different regions of the waveguide (individual cells) are assigned different electromagnetic field characteristics. By locally optimizing the field amplitude and phase in each cell, the system achieves high acceleration speed while maintaining a tight beam spot size through localized field control.
3Use of energy by moving object
If all cells are activated to maximize electron energy, then total energy gain is improved, but energy spread increases
Solution Approach 1:
The system incorporates feedback mechanisms to monitor electron beam energy distribution and dynamically adjust the electromagnetic field in individual cells. This feedback control maintains stable energy distribution by compensating for variations in real-time, preventing energy spread while achieving total energy gain.
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 solution provides accurate control over electron energy and beam spot size, reducing energy spread and improving the precision of therapeutic radiation delivery, enhancing treatment outcomes in medical applications.
Implementation Method 1
Electromagnetic waves, typically radio frequency ('RF') waves, are applied to the waveguide and made to propagate down the waveguide. The electromagnetic waves produce an oscillating electromagnetic field in each cavity or cell.
Implementation Method 2
It is the action of these electromagnetic fields which causes electrons to be accelerated along the acceleration path.
Data Source
AI summary
Disclosed herein is a waveguide for use in a linear accelerator. The waveguide comprises cells arranged to receive a beam of charged particles therethrough along a particle path, and is configured to receive an electromagnetic field from a source of electromagnetic radiation. A plurality of the cells are individually switchable cells, with each individually switchable cell comprising a respective switch configured to adjust the supply of electromagnetic radiation to the individually switchable cell.