Dual Hollow Cathode Ion Source for Contamination-Free Extraction
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Solution Overview
Problem
Ion sources used in various applications, such as substrate treatment and spacecraft acceleration, face complexity due to the need for additional components like electrodes, magnetic fields, and neutralizers to balance electrical imbalances and prevent contamination of vacuum hardware during dielectric deposition processes.
Innovation Solution
A hollow-cathode-based ion source design that eliminates the need for additional electrodes, accelerating grids, magnetic fields, or neutralizers by using two hollow cathodes configured to alternate as electrodes and counter-electrodes, generating a plasma and accelerating ions within the same chamber without external components, thus simplifying the ion source structure and protecting cathode and anode surfaces from contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional components (electrodes, magnetic fields, neutralizers) are added to extract and accelerate ions, then ion beam generation capability is improved, but device complexity increases
Solution Approach 1:
The patent combines the plasma-forming cathode and ion extraction/acceleration functions into a single integrated hollow cathode structure. The hollow cathode generates plasma internally and uses its own electric field to extract and accelerate ions, eliminating the need for separate extraction electrodes, magnetic fields, and neutralizer components that would otherwise be required.
Solution Approach 2:
The hollow cathode serves multiple functions simultaneously: it acts as the plasma-forming component, the ion extraction electrode, and the ion acceleration electrode. This multi-functional design replaces what would traditionally require multiple separate components, thereby reducing device complexity while maintaining ion beam generation capability.
2Object-affected harmful factors
If additional components are added to balance electrical imbalance, then vacuum hardware protection is improved, but device complexity increases
Solution Approach 1:
The hollow cathode structure generates its own plasma and electric field, which automatically balances the charge extraction process. The internal plasma environment provides the necessary electrons to balance the positive ion extraction, eliminating the need for external neutralizer components that would otherwise be required to protect vacuum hardware from electrical imbalance.
3Productivity
If separate anode structure is used for ion extraction, then ion extraction efficiency is improved, but device complexity and contamination risk increase
Solution Approach 1:
The patent merges the anode function into the hollow cathode structure itself. The hollow cathode's electric field and plasma environment directly enable efficient ion extraction without requiring a separate anode structure, thereby maintaining ion extraction efficiency while reducing device complexity and contamination risk.
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 design enables the creation of an energetic ion beam without additional components, reducing complexity and contamination risks, while maintaining effective ion extraction and acceleration, suitable for applications like PECVD processes and substrate coating.
Implementation Method 1
The first hollow cathode and the second hollow cathode are configured to alternatively function as electrode and counter-electrode to generate a plasma
Implementation Method 2
Each of the first ion acceleration cavity and the second ion acceleration cavity are sufficient to enable the extraction and acceleration of ions
Data Source
AI summary
A method of extracting and accelerating ions is provided. The method includes providing a ion source. The ion source includes a chamber. The ion source further includes a first hollow cathode having a first hollow cathode cavity and a first plasma exit orifice and a second hollow cathode having a second hollow cathode cavity and a second plasma exit orifice, the first and second hollow cathodes being disposed adjacently in the chamber. The ion source further includes a first ion accelerator between and in communication with the first plasma exit orifice and the chamber. The first ion accelerator forms a first ion acceleration cavity. The ion source further includes a second ion accelerator between and in communication with the second plasma orifice and the chamber. The second ion accelerator forms a second ion acceleration cavity. The method further includes generating a plasma using the first hollow cathode and the second hollow cathode. The first hollow cathode and the second hollow cathode are configured to alternatively function as electrode and counter-electrode. The method further includes extracting and accelerating ions. Each of the first ion acceleration cavity and the second ion acceleration cavity are sufficient to enable the extraction and acceleration of ions.