Focused Ion Beam Emitter Tip Cleaning via Gas Pressure Control
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Solution Overview
Problem
Ion beam devices face stability issues due to contamination of the emitter tip, requiring frequent and costly ultra-high vacuum cleaning to maintain performance, which is inefficient and resource-intensive.
Innovation Solution
A method and apparatus for a focused ion beam device that uses a gas field ion source with a controlled gas inlet and outlet to increase the partial pressure in the emitter tip region for cleaning, replacing contaminating gases with desired gas atoms, allowing for effective cleaning at reduced vacuum requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultra-high vacuum cleaning is used to remove contamination from the emitter tip, then cleaning effectiveness is improved, but device complexity and operating costs increase
Solution Approach 1:
The invention changes the pressure parameter in the emitter tip region from ultra-high vacuum to a higher pressure environment during cleaning operations. By introducing gas at elevated pressure into the emitter tip region, the cleaning process becomes effective without requiring complex ultra-high vacuum systems, thus resolving the contradiction between cleaning effectiveness and device complexity
Solution Approach 2:
The invention converts the harmful effect of gas pressure (which could interfere with ion beam generation) into a beneficial cleaning mechanism. By temporarily increasing gas pressure in the emitter tip region, contaminating particles are flushed away, and the gas flow itself serves as the cleaning agent, eliminating the need for complex vacuum cleaning systems
2Reliability
If ultra-high vacuum is maintained for emitter cleaning, then contaminant removal is improved, but operating costs and time consumption increase
Solution Approach 1:
The invention changes the pressure parameter from ultra-high vacuum to elevated pressure gas environment, enabling cleaning to occur much faster. The high pressure gas flow rapidly flushes contaminants from the emitter tip region without requiring the time-consuming vacuum pumping process, thus reducing cleaning cycle time while maintaining cleaning effectiveness
Solution Approach 2:
The invention replaces the mechanical vacuum pumping system with a gas flow-based cleaning mechanism. Instead of using mechanical pumps to remove contaminants, the system uses directed gas flow to flush contaminants away, significantly reducing the time required for cleaning operations
3Productivity
If gas pressure is increased in the emitter tip region for cleaning, then cleaning effectiveness is improved, but ion beam generation may be interfered with
Solution Approach 1:
The invention segments the device into distinct functional regions: the emitter tip region where cleaning occurs at elevated pressure, and the ion beam generation region where vacuum conditions are maintained. By spatially separating these functions, the system can increase gas pressure locally for cleaning without interfering with ion beam generation in other regions
Solution Approach 2:
The invention uses periodic switching between cleaning mode and ion beam generation mode. During cleaning, gas pressure is increased in the emitter tip region; during ion beam generation, the system returns to vacuum conditions. This periodic action allows both cleaning effectiveness and ion beam stability to be maintained at different times in the operational cycle
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 simplifies and enhances the cleaning process, improving ion beam stability and reducing vacuum requirements, thereby decreasing costs and extending the lifespan of the emitter tip.
Implementation Method 1
Charged particle beams, in particular ion beams, offer superior spatial resolution compared to photon beams, due to their short wave lengths at comparable particle energy
Implementation Method 2
By heating the emitter, contaminating particles may be released from the emitter and its surroundings
Implementation Method 3
introducing the gas into the emitter tip region such that the gas has a second partial pressure of at least two times the first pressure
Data Source
AI summary
A method of operating a focused ion beam device for emitting during operation a focused ion beam including ions of a gas generated at a first partial pressure, comprising cleaning an emitter tip positioned in an emitter tip region of the focused ion beam device, the cleaning comprises introducing the gas into the emitter tip region such that the gas has a second partial pressure of at least two times the first pressure. Further, a focused ion beam device is provided, comprising a gas field emitter tip (13) in an emitter tip region emitting an ion beam including ions of a gas, a gas inlet for supplying a gas with different pressures (110), a gas outlet (120), a pressure measurement device for measuring the pressure in the emitter tip region and a control unit (130) for controlling switching between an operation mode and a cleaning mode, further controlling the pressures in the emitter tip region and being connected to the pressure measurement device.