Particle Beam Generator Emission Current Stabilization
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Solution Overview
Problem
Existing particle beam generators, particularly ion beam generators, face challenges in maintaining a constant emission current due to inherent physical characteristics, leading to fluctuations that require frequent realignment and adjustment of the ion beam path, resulting in inefficiencies and potential exhaustion of the ion source.
Innovation Solution
A method involving a particle beam generator with adjustable extractor and suppressor voltages allows for precise control of the emission current, ensuring a specific emission current is maintained without realigning the ion beam path, using a liquid metal ion source and varying voltages within suitable ranges to stabilize the emission current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the emission current is allowed to fluctuate according to inherent physical characteristics, then the device complexity is reduced, but the reliability deteriorates due to frequent realignment requirements
Solution Approach 1:
The patent implements a feedback control system that continuously monitors the emission current and automatically adjusts the extractor voltage to maintain a constant current. The control unit receives signals about the actual emission current and modifies the extractor voltage accordingly, creating a closed-loop system that eliminates fluctuations without adding complex mechanical realignment mechanisms.
Solution Approach 2:
The patent changes the electrical parameter (extractor voltage) dynamically to compensate for emission current fluctuations. By adjusting the extractor voltage based on the actual emission current, the system maintains stable operation without requiring mechanical realignment or complex structural modifications.
2Manufacturing precision
If the suppressor voltage is adjusted to maintain specific emission current, then the manufacturing precision is improved, but the ease of operation worsens due to additional control requirements
Solution Approach 1:
The control unit continuously monitors the emission current and automatically adjusts the suppressor voltage to maintain the desired emission current level. This automated feedback mechanism eliminates the need for manual adjustments, improving precision while actually simplifying operation through automation.
Solution Approach 2:
The system performs self-adjustment by automatically modifying the suppressor voltage based on real-time emission current measurements. The particle beam generator regulates its own operation without external intervention, maintaining precise emission current while reducing operational complexity.
3Reliability
If frequent realignment of the ion beam path is performed to compensate for emission current fluctuations, then the reliability is improved, but the loss of time increases due to repeated adjustments
Solution Approach 1:
The patent ensures continuous stable emission current through automated voltage control, eliminating the need for periodic realignment interruptions. The feedback control system maintains constant current continuously, allowing the particle beam device to operate without time-loss interruptions for realignment.
Solution Approach 2:
The real-time feedback control prevents emission current fluctuations before they require realignment correction. By continuously monitoring and adjusting the extractor voltage, the system maintains stable beam conditions, eliminating the need for time-consuming realignment operations.
4Productivity
If the extractor voltage is varied to stabilize emission current, then the productivity is improved, but the device complexity increases due to additional voltage control mechanisms
Solution Approach 1:
The patent uses a feedback control system that automatically adjusts the extractor voltage based on real-time emission current measurements. This automated control improves productivity by eliminating manual intervention and maintaining optimal operation continuously, while the complexity is managed through standard control electronics rather than complex mechanical systems.
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 stabilizes the emission current, reducing the need for frequent realignment and maintaining the ion beam's focus on the object, thereby enhancing operational efficiency and extending the ion source's lifespan.
Implementation Method 1
at least one extractor electrode (102, 331C) configured to extract the charged particles from the particle source (331A)
Implementation Method 2
at least one suppressor electrode (101A, 331B) configured to suppress emissions of the charged particles from a side surface of the particle source (331A)
Implementation Method 3
In particular, the particle source (331A) may be a liquid metal ion source (LMIS), for example a gallium liquid metal ion source
Data Source
AI summary
A method for operating a particle beam generator for a particle beam device, and a particle beam device for carrying out this method, are provided. An extractor voltage may be set to an extractor value using a first variable voltage supply unit. An emission current of the particle beam generator may be measured. When the emission current of the particle beam generator decreases, a suppressor voltage applied to a suppressor electrode may be adjusted using a second variable voltage supply unit such that a specific emission current of the particle beam generator is reached or maintained. When the emission current of the particle beam generator increases, the extractor voltage applied to the extractor electrode may be adjusted using the first variable voltage supply unit such that the specific emission current of the particle beam generator is reached or maintained.