Electron Beam Gun Thermal Stability via Segmented Cathode
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Solution Overview
Problem
Prior electron beam guns suffer from thermal gradient-induced warpage and misalignment of the beam former, leading to electron arcing and non-uniform evaporation, as well as potential short circuits and anode erosion due to misalignment and thermal cycling.
Innovation Solution
The electron beam gun design incorporates a beam former integrally formed within a massive cathode block, which conducts heat away from the beam former, reducing the likelihood of warpage and misalignment, and features an offset split configuration and arch-shaped interior surface to prevent direct electron paths and enhance alignment, along with a single insulating support base for precise positioning of cathode blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the beam former is separately connected to one side of the cathode block, then the beam former can be insulated from the cathode block to prevent short circuits, but a thermal gradient is produced causing warpage and misalignment
Solution Approach 1:
The beam former is divided into two separate sections, with each section connected to a different cathode block. This segmentation allows each section to be independently supported and insulated, preventing thermal gradients while maintaining alignment precision through symmetric configuration
Solution Approach 2:
The patent employs an asymmetric connection configuration where one cathode block is substantially more massive than the other, creating an asymmetric thermal mass distribution that compensates for the asymmetric beam former sections and maintains overall thermal balance and alignment
2Device complexity
If the beam former is connected to one side of the cathode block, then the structure is simplified, but thermal gradient causes warpage and misalignment over service life
Solution Approach 1:
The beam former is segmented into two sections connected to separate cathode blocks, distributing thermal loads and preventing the development of thermal gradients that cause warpage, while maintaining a relatively simple overall structure
Solution Approach 2:
Each cathode block is designed with different masses to provide asymmetric thermal management, with the more massive block absorbing more thermal energy to balance the thermal loads across the symmetric beam former sections
3Productivity
If the beam former is positioned to allow electrons to pass, then electron beam production is efficient, but misalignment causes electron arcing and anode erosion
Solution Approach 1:
The beam former is divided into two sections with spaced-apart configuration, creating a more stable electron path that prevents arcing while maintaining efficient electron beam production through the segmented structure
Solution Approach 2:
The symmetric, thermally-balanced beam former configuration prevents misalignment before it can occur, cushioning against the development of conditions that would lead to electron arcing and anode erosion during operation
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 stabilizes the beam former, reduces electron leakage, minimizes damage to components, and maintains precise alignment over the electron beam gun's service life, enhancing thermal stability and operational performance.
Implementation Method 1
a first one of the two cathode blocks is substantially more massive than a second of the two cathode blocks, and wherein within the first cathode block is integrally formed a beam former so that heat is conducted away from beam former to the first cathode block
Implementation Method 2
Two filament buss bars 28 and 30 are in turn connected to sides 14 and 16 of filament block 12 to apply an electric current across sides 14 and 16 of cathode block 12, and thus, filament 18. The electric current causes filament 18 to emit electrons.
Implementation Method 3
An anode 56 is provided to accelerate electrons emitted by filament 18
Data Source
Figure 1
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Figure 3~5
AI summary
An electron beam gun with an arched shaped beam former as an integral part of a massive cathode block which conducts heat away from the beam former and with a filament mounted to the cathode block for improved alignment.