Hollow Cathode Arc Plasma Device Bipolar Pulsed Voltage
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Solution Overview
Problem
Existing hollow cathode arc discharge plasma devices face limitations in generating high-intensity and large-volume plasmas due to complex structures and requirements for maintaining electrical conductivity, especially when dealing with insulating materials, and struggle to maintain plasma stability at higher ambient pressures.
Innovation Solution
A device comprising two plasma-generating units with hollow cathodes and ring-shaped electrodes, connected by a pulse generator producing bipolar medium-frequency voltage, eliminating the need for a DC voltage source and utilizing magnetic coils to enhance plasma generation and stability, allowing for high-intensity and large-volume plasma creation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a longitudinal magnetic field is generated to bind higher-energy beam electrons, then plasma density is maintained at a distance from the substrate, but the build-up of high self-bias potential is prevented and the device structure becomes complex
Solution Approach 1:
The patent extracts the magnetic field generating device from the system, eliminating the need for complex magnet systems while maintaining plasma generation capability through the hollow cathode arc discharge mechanism alone
Solution Approach 2:
The hollow cathode structure itself generates the necessary plasma and electron acceleration without requiring external magnetic field generation, making the system self-sufficient and structurally simpler
2Reliability
If a ring anode is arranged directly in front of the hollow cathode, then insulating layer deposition is avoided, but charge carrier density in the plasma is significantly reduced
Solution Approach 1:
The patent transitions from a two-dimensional ring anode configuration to a three-dimensional hollow cathode structure with radial electron emission, enabling plasma generation throughout the hollow cathode volume and achieving high charge carrier density without insulating layer deposition issues
3Volume of stationary object
If two plasma-generating devices with DC voltage sources are arranged to create bipolar pulsed voltage, then large-volume plasma is generated, but the structure becomes technically demanding with many process parameters to regulate
Solution Approach 1:
The patent employs periodic switching of a single DC voltage source between two hollow cathodes to generate bipolar pulsed voltage, achieving large-volume plasma through temporal alternation rather than simultaneous dual-device operation, thereby simplifying the overall structure
Solution Approach 2:
The patent combines the functions of two separate plasma-generating devices with DC voltage sources into a single device with one DC voltage source that alternates between two hollow cathodes, reducing structural complexity while maintaining plasma volume
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
The solution enables the generation of stable, high-intensity plasmas with a large volume, even at higher ambient pressures, simplifying the device structure and reducing the complexity of process parameter regulation, while effectively supporting both conductive and insulating material vaporization.
Implementation Method 1
hollow cathode arc discharge sources
Implementation Method 2
generating dense plasmas for vacuum processes
Implementation Method 3
If a longitudinal magnetic field is generated by suitable magnetic field generating devices in such a way that some of its field lines lead from the hollow cathode to the anode, higher-energy beam electrons remain bound in the area of the connecting field lines
Implementation Method 4
a ring-shaped anode (a so-called ring anode) is arranged directly in front of the hollow cathode in order to generate the plasma that is effective for plasma activation solely through the beam electrons which penetrate the opening of the ring anode
Implementation Method 5
A device according to the invention also includes a pulse generator which is electrically connected to the two hollow cathodes and which generates a bipolar medium-frequency pulsed electrical voltage between the two hollow cathodes
Implementation Method 6
a large-volume hollow cathode arc discharge plasma is created
Data Source
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AI summary
The invention relates to a device for generating a hollow cathode arc discharge plasma, consisting of two plasma sources (11; 12), each comprising a hollow cathode (13; 14) and an electrode (15; 16) that is associated with the hollow cathode (13; 14) and has an opening extending through the electrode (15; 16), wherein the hollow cathodes (13; 14) of the two plasma sources (11; 12) are connected to a pulse generator (17) that generates a bipolar, medium frequency pulsed voltage between the two hollow cathodes (13; 14). In both plasma sources (11; 12), the hollow cathode (13; 14) is connected in an electrically conductive manner to the associated electrode (15; 16), either directly or with the intercalation of at least one component (38; 39) that delimits the current direction.