Slit Disk for Electron Beam Power Density Diagnostics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electron beam diagnostic methods struggle with the repeatability of focusing electron beams to a known power density, affecting weld quality, especially when welds are transferred between different machines, due to limitations in the number of radial slits on the tungsten disk, which constrain the resolution of beam reconstruction.
Innovation Solution
The use of a tungsten disk with radial slits that deviate from a straight alignment, providing multiple angles for beam profiling, allowing for increased resolution without additional hardware, such as precision rotation stages, by employing 'bent' or 'crooked' slit designs that offer multiple scanning angles, enhancing the accuracy of beam power distribution characterization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If straight radial slits are used on the tungsten disk, then the device structure is simple, but the beam reconstruction resolution is limited
Solution Approach 1:
The tungsten disk is segmented into multiple slits arranged at different radial positions and angles. Each slit provides a specific viewing angle for beam profiling, and the combination of multiple slits enables high-resolution reconstruction without requiring a single complex rotating component.
Solution Approach 2:
The slits are positioned at different radial distances from the disk center, creating a two-dimensional arrangement (angular position + radial distance) rather than a simple one-dimensional array. This dimensional expansion allows multiple profile angles to be achieved simultaneously with a stationary disk.
2Measurement precision
If more radial slits are added to improve resolution, then beam reconstruction accuracy improves, but heat deposition on the disk increases
Solution Approach 1:
The slits are strategically positioned at specific radial locations where they can capture necessary beam profile information while minimizing the total slit area. The varying radial positions allow optimization of the balance between measurement coverage and heat absorption, with each slit location contributing differently to the overall measurement quality.
3Device complexity
If a stationary disk with multiple angle slits is used, then hardware complexity is reduced, but the number of available profile angles is limited
Solution Approach 1:
The disk is divided into multiple discrete slit segments at different angular positions and radial distances. This segmentation allows the stationary disk to provide multiple fixed profile angles simultaneously, replacing the need for a single rotating slit or multiple rotating components.
Solution Approach 2:
The tungsten disk serves multiple functions simultaneously: it acts as a beam stop, provides multiple viewing angles through differently positioned slits, and enables beam profiling without requiring rotation mechanisms. The single stationary disk structure performs what would otherwise require multiple moving parts.
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 increases the number of available profile angles, improving the resolution and accuracy of beam reconstruction, ensuring consistent weld quality across different machines and equipment setups, while minimizing hardware requirements and heat deposition on the tungsten disk.
Implementation Method 1
A beam diagnostic device has already been developed that can be used to measure the beam properties while it is being scanned in a circle over a tungsten disk with radial slits. A time history of the portions of the beam passing through the slits provides beam profile data
Implementation Method 2
a Faraday cup assembly located below the disk and positioned to receive the electron and ion beams for providing diagnostic characterization of the electron and ion beams
Data Source
AI summary
A diagnostic system for characterization of an electron beam or an ion beam includes an electrical conducting disk of refractory material having a circumference, a center, and a Faraday cup assembly positioned to receive the electron beam or ion beam. At least one slit in the disk provides diagnostic characterization of the electron beam or ion beam. The at least one slit is located between the circumference and the center of the disk and includes a radial portion that is in radial alignment with the center and a portion that deviates from radial alignment with the center. The electron beam or ion beam is directed onto the disk and translated to the at least one slit wherein the electron beam or ion beam enters the at least one slit for providing diagnostic characterization of the electron beam or ion beam.