Hollow cathode discharge assistant transformer coupled plasma source and operation method of the same
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Solution Overview
Problem
Existing transformer coupled plasma (TCP) technology struggles to generate stable high-density plasma under high gas pressure and high gas flow rates, often requiring high-voltage ignition devices and resonance operations, which can lead to plasma instability and equipment damage.
Innovation Solution
The integration of a hollow cathode discharge mechanism with a transformer coupled plasma source, allowing the hollow cathode discharge to initiate and maintain plasma in different regions of the reaction chamber, thereby enhancing the TCP mechanism's ability to form an annular plasma structure and achieve high-power coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a ferrite transformer magnetic core is used to generate induced electric field in an annular vacuum chamber, then plasma generation is achieved, but the electric field concentrates in the electrical barrier area causing regional discharge and potential damage to the ceramic ring plate and drive power supply
Solution Approach 1:
A dielectric layer is introduced as an intermediary between the ferrite transformer magnetic core and the annular vacuum chamber. This dielectric layer acts as a mediator that distributes the electric field more uniformly across the chamber wall, preventing concentration at the electrical barrier area and eliminating regional discharge while maintaining effective plasma generation
Solution Approach 2:
The electrical properties of the chamber wall are modified by coating it with a dielectric material. This changes the electrical parameters (permittivity, surface resistance) of the chamber wall, allowing for more uniform electric field distribution and preventing the field concentration that leads to ceramic ring plate damage and power supply failure
2Power
If high-voltage devices or high AC voltage are introduced to generate local radio-frequency glow discharge, then plasma ignition is achieved under high gas pressure and flow rate, but the service life of the high-voltage discharge device and vacuum window is limited
Solution Approach 1:
The patent replaces the mechanical/electrical high-voltage discharge device with an electromagnetic field-based solution. By using the ferrite transformer magnetic core to generate an induced electric field that couples with the plasma, the system achieves plasma ignition and maintenance under high pressure without relying on high-voltage electrodes or discharge devices, thereby eliminating their service life limitations
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 composite plasma source effectively generates high-power and high-density plasma under challenging conditions, improving stability and reducing the risk of equipment damage, while eliminating the need for high-voltage ignition devices and resonance operations.
Implementation Method 1
The power supply is connected to a primary-side coil of the ferrite transformer magnetic core 502 to generate a magnetic field, and a magnetic flux in the magnetic core induces an electric field in the annular vacuum chamber 500 to drive an electron drift current
Implementation Method 2
the second voltage is applied to at least one hollow cylindrical tube of the reaction chamber to excite a working gas in the annular channel into a plasma through a hollow cathode discharge mechanism
Data Source
AI summary
Disclosed are a hollow cathode discharge assistant transformer coupled plasma source and an operation method of the same. A reaction chamber with an annular channel is provided, and a ferrite transformer with a first ferrite magnetic core wound with a first coil and a second ferrite magnetic core wound with a second coil and a drive power source is provided. The drive power source applies an AC power supply with a first voltage to the first coil to generate an alternating magnetic field. The second coil generates a second voltage by inducing the alternating magnetic field to excite a working gas in the annular channel into a plasma through a hollow cathode discharge mechanism. The annular channel induces the alternating magnetic field through a transformer coupled plasma mechanism to generate an induced electric field to excite the plasma to form an electric current in the annular channel.