Ion Source Chlorine Co-Gas Control for DMAC Buildup
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Solution Overview
Problem
Prolonged use of DMAC in ion sources for generating aluminum ions leads to the buildup of decomposition material, such as aluminum carbide, which causes nonuniform ion beams and reduces gas flow, necessitating frequent cleaning and affecting component integrity.
Innovation Solution
Introducing a chlorine-containing gas, either continuously or periodically, to control the buildup of decomposition material by forming HCl and preventing carbon-rich deposits, while maintaining ion beam uniformity and extending operational life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If DMAC is used to generate aluminum ions, then ion beam production is achieved, but decomposition material buildup occurs in the arc chamber
Solution Approach 1:
A chlorine-containing gas is introduced as an intermediary substance that reacts with carbon-rich decomposition materials to form volatile HCl and aluminum chloride. This mediator prevents carbon deposit formation by converting it into removable compounds, thereby resolving the contradiction between maintaining ion production and preventing decomposition buildup.
Solution Approach 2:
The chemical composition of the gas environment is changed by adding chlorine-containing gas. This parameter change transforms the decomposition pathway of DMAC, shifting from carbon-rich deposit formation to formation of volatile aluminum chloride and HCl, thus preventing buildup while maintaining ion generation.
2Productivity
If DMAC is used continuously, then ion beam generation is maintained, but gas flow is reduced due to buildup around gas bushing
Solution Approach 1:
The chlorine-containing gas acts as a protective intermediary that prevents decomposition materials from accumulating around the gas bushing. By converting potential deposits into volatile compounds, it maintains clear gas flow paths, ensuring both continuous operation and stable gas flow delivery.
3Duration of action of moving object
If DMAC is used for extended periods, then ion production continues, but repeller shorts due to decomposition buildup
Solution Approach 1:
The harmful decomposition materials that would otherwise cause shorting are converted into beneficial volatile compounds (HCl and aluminum chloride) through reaction with chlorine-containing gas. This transforms a harmful accumulation process into a protective cleaning mechanism, extending component life and operational duration.
Solution Approach 2:
The chlorine-containing gas serves as a protective intermediary layer that prevents direct contact between decomposition materials and the repeller surface. By forming volatile reaction products in the gas phase, it eliminates the shorting pathway while allowing continuous operation.
4Manufacturing precision
If extraction aperture is blocked by whiskers, then ion beam uniformity deteriorates, but cleaning processes are required
Solution Approach 1:
The system performs self-cleaning through the chemical reaction between chlorine-containing gas and decomposition materials. The volatile reaction products are naturally removed from the arc chamber, maintaining aperture cleanliness and beam uniformity without requiring external cleaning interventions.
Solution Approach 2:
The chlorine-containing gas acts as a self-cleaning intermediary that continuously removes decomposition materials from the extraction aperture. By converting deposits into volatile compounds, it maintains aperture openness and ion beam uniformity without requiring manual cleaning.
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
Reduces decomposition material buildup, maintains ion beam uniformity, and extends operational time to over 500 hours without requiring dedicated cleaning processes.
Implementation Method 1
Introducing a chlorine-containing gas, either continuously or periodically, to control the buildup of decomposition material by forming HCl
Implementation Method 2
The filament emits thermionic electrons, which are accelerated toward and heat the cathode, in turn causing the cathode to emit electrons into the arc chamber
Implementation Method 3
In some embodiments, a magnetic field is used to further confine the electrons within the arc chamber
Data Source
AI summary
An ion source for generating an ion beam containing aluminum ions is disclosed. The ion source includes a first gas source to introduce an organoaluminium compound into the arc chamber of the ion source. A second gas, different from the first gas, which is a chlorine-containing gas is also introduced to the arc chamber. The chloride co-flow reduces the buildup of decomposition material that occurs within the arc chamber. This buildup may occur at the gas bushing, the extraction aperture or near the repeller. In some embodiments, the second gas is introduced continuously. In other embodiments, the second gas is periodically introduced, based on hours of operation or the measured uniformity of the extracted ion beam. The second gas may be introduced from second gas source or from a vaporizer.