Charged Particle Beam Alignment via Deflector Mediator
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Solution Overview
Problem
In electron microscopes, periodic realignment of charged particle beams is time-consuming and tedious, whether performed manually or automatically, necessitating improved alignment methods.
Innovation Solution
An automated method for charged-particle beam alignment in electron microscopes using a beam deflector and detector system, where the beam is deflected to a reference location to determine alignment, allowing for correction and realignment without technician assistance, even during sample exchange or system venting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If automated beam alignment methods are implemented, then alignment time and effort are reduced, but system complexity increases due to additional components like beam deflectors and detectors
Solution Approach 1:
A beam deflector is introduced as an intermediary component to redirect the charged particle beam to a reference location displaced from the primary axis. This mediator enables automated alignment by allowing the beam to be systematically positioned and detected without manual intervention, resolving the contradiction between reduced alignment time and increased system complexity.
Solution Approach 2:
The patent replaces manual mechanical alignment operations with an automated electronic system comprising a beam deflector controlled by a computer. The computer generates deflection drives to automatically position the beam at the reference location and calculates correction values, substituting tedious manual procedures with automated electronic control to reduce alignment time despite adding system complexity.
2Measurement precision
If a beam deflector is added for automated alignment, then alignment precision is improved, but device complexity increases
Solution Approach 1:
The beam deflector serves as a precision intermediary that enables accurate beam positioning at the reference location. By introducing this controlled deflection mechanism, the system achieves higher alignment precision through automated electronic control rather than manual adjustment, accepting the trade-off of increased device complexity.
Solution Approach 2:
The system employs a feedback mechanism where a detector monitors the beam position at the reference location, and the computer calculates correction values based on detected signals. This closed-loop feedback system continuously refines alignment precision by comparing actual beam position with the desired reference location and applying corrective deflection drives.
3Productivity
If automated alignment is performed during sample exchange or venting, then productivity is improved, but reliability may be affected by environmental changes
Solution Approach 1:
The system performs preliminary alignment actions during sample exchange or venting periods when the beam is not actively being used for imaging. By proactively realigning the beam during these idle periods, the system maintains beam stability and readiness for the next imaging session, improving overall productivity without compromising reliability during actual operations.
Solution Approach 2:
The automated alignment system enables the microscope to perform self-alignment during venting or pumping cycles without requiring technician intervention. The computer-controlled beam deflector and detector system autonomously detects beam position drift and applies corrections, allowing the system to service itself during routine maintenance operations and maintain reliability while improving productivity.
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 efficient and automated charged-particle beam alignment, reducing the time and effort required for realignment and maintaining beam stability during operations like sample imaging and processing.
Implementation Method 1
a beam deflector operable to deflect a CPB
Implementation Method 2
a detector displaced from a primary axis of the CPB microscope for beam alignment
Data Source
AI summary
A charged-particle beam (CPB) is aligned to a primary axis of a CPB microscope by determining a first beam deflection drive to a beam deflector for directing the CPB passing a reference location displaced from the primary axis. The beam deflector is provided with a second beam deflection drive during the working mode of the CPB microscope to propagate the beam along the primary axis. The second beam deflection drive is determined based on the first beam deflection drive.