Cathode Barrier Plate Enhances Electron Blocking
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Solution Overview
Problem
Cathodes with surface emitters face challenges in achieving high electron emission and long lifespan while maintaining effective blocking capability, especially in applications requiring fast electron emission blocking, due to their larger radiating surface which makes them difficult to block using electrical fields, leading to higher field strengths and increased design complexity.
Innovation Solution
Incorporating at least one electrically conductive barrier plate galvanically separated from the surface emitter, which can be at a different potential than the cathode head, to enhance blocking capability without increasing heating currents or design complexity, allowing for efficient electron emission and extended lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a surface emitter with large radiating surface is used, then electron emission is improved, but blocking capability deteriorates
Solution Approach 1:
An electrically conductive barrier plate is introduced as an intermediary element between the surface emitter and the external blocking field. This barrier plate, which is galvanically separated from the surface emitter, acts as a mediator that enhances the blocking capability by creating a localized high-field region near the emitter surface, thereby compensating for the reduced effectiveness of external blocking fields on large-area surface emitters.
2Ease of operation
If higher field strengths are applied to block surface emitter, then blocking capability is improved, but device complexity and minimum distances increase
Solution Approach 1:
The barrier plate creates a localized high electric field region specifically at the cathode head surface where electron emission occurs. This local field enhancement allows effective blocking without requiring uniformly high field strengths across the entire device, thereby reducing minimum distance requirements and avoiding additional construction expenditure while maintaining blocking capability.
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
The solution enables effective blocking of electron emission with reduced field strengths and minimal design modifications, maintaining high electron emission and extended cathode lifespan, suitable for applications like pulsed x-ray radiation.
Implementation Method 1
a surface emitter is arranged that emits electrons upon application of a heating voltage
Implementation Method 2
at least one electrically conductive barrier plate that is galvanically separated from the surface emitter extends up to the surface emitter
Data Source
AI summary
A cathode has a cathode head in which is arranged a surface emitter is arranged that emits electrons upon the application of a heating voltage. At least one electrically conductive barrier plate that is galvanically separated from the surface emitter extends up to the surface emitter. This cathode has a longer lifespan, a high electron emission and a good blocking capability.