Photocathode Electron Gun Axis Verification With Intermediate Electrode
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Solution Overview
Problem
There is no known method to verify misalignment of an electron beam emitted from a photocathode, which is crucial for ensuring proper alignment and functionality in devices like electron microscopes and free electron laser accelerators.
Innovation Solution
An electron gun design incorporating an intermediate electrode, an electron beam shielding member, a measurement unit, and an electron beam emission direction deflector, which allows for the verification and alignment of the electron beam's emission axis by measuring intensity changes and adjusting the electron beam's path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an electron gun with photocathode is used, then the electron beam brightness and resolution are improved, but there is no known method to verify misalignment of the emission axis
Solution Approach 1:
The patent introduces an intermediate electrode as a mediator between the photocathode and anode. This intermediate electrode enables the verification of emission axis alignment by creating a drift space where electron beam position can be measured without the influence of strong electric fields, thus solving the measurement verification problem while maintaining the brightness advantages of photocathode electron guns.
2Ease of operation
If manual alignment operation is performed, then the alignment work can be completed, but the process is time-consuming and labor-intensive
Solution Approach 1:
The patent implements an automated feedback system that uses the intermediate electrode to detect electron beam position and provides real-time feedback for alignment adjustment. The system includes a control unit that automatically adjusts the photocathode or light source position based on detected misalignment, eliminating manual operation and significantly reducing alignment time.
Solution Approach 2:
The alignment system performs self-service by automatically detecting its own misalignment state through the intermediate electrode and correcting it without external intervention. The control unit autonomously adjusts components to maintain proper alignment, making the system self-correcting and eliminating the need for manual alignment operations.
3Measurement precision
If a drift space is formed in the intermediate electrode, then the electron beam position can be accurately measured, but the device structure becomes more complex
Solution Approach 1:
The intermediate electrode serves multiple functions: it creates the drift space for position measurement, maintains the vacuum seal, and can be integrated with existing electron gun components. By making the intermediate electrode multi-functional, the patent achieves precise measurement capability without proportionally increasing device complexity.
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
Enables accurate verification and alignment of the electron beam's emission axis, ensuring it aligns with the designed center axis, thereby improving the performance and reliability of electron beam-based devices.
Implementation Method 1
a photocathode configured to emit an electron beam in response to receiving light from the light source
Implementation Method 2
an electron beam emission direction deflector arranged between the anode and the electron beam shielding member and configured to change a position where an electron beam that passed through the anode reaches the electron beam shielding member
Data Source
AI summary
An object is to provide an electron gun that makes it possible to verify whether or not an electron beam emitted form a photocathode is misaligned from a designed emission center axis. The object can be achieved by an electron gun including: a light source; a photocathode; and an anode. The electron gun includes an intermediate electrode arranged between the photocathode and the anode, an electron beam shielding member configured to block a part of an electron beam, a measurement unit configured to measure an intensity of an electron beam blocked by the electron beam shielding member, and an electron beam emission direction deflector arranged between the anode and the electron beam shielding member and configured to change a position where an electron beam that passed through the anode reaches the electron beam shielding member. The intermediate electrode has an electron beam passage hole and a drift space.