RF Grounded Pathway for Plasma Extension and Concentration
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Solution Overview
Problem
Existing plasma processing technologies face challenges in effectively extending and concentrating plasma downstream from the source, leading to reduced reactive neutral species concentration and increased energy photon and electrical charge exposure on treated articles.
Innovation Solution
The implementation of a RF grounded pathway coupled to the exhaust side of the plasma discharge chamber allows for the selective extension and concentration of plasma by dissociating gases, including inert and reactive gases, using RF power to create and direct a concentrated plasma to the treatment chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the plasma source parameters (dissociating power and pressure) are increased to extend the plasma, then the plasma extension distance is improved, but the device complexity and energy consumption increase significantly
Solution Approach 1:
A dielectric barrier layer is introduced as an intermediary between the plasma source and the article. This barrier layer enables plasma extension through electrical field coupling without requiring direct plasma contact, thereby extending the plasma reach while maintaining simpler source parameters and reducing overall system complexity
Solution Approach 2:
The patent replaces the mechanical approach of increasing plasma source power and pressure with an electrical field-based approach. By applying RF power through the dielectric barrier, the plasma is extended electromagnetically rather than mechanically, reducing the need for high-power plasma sources and associated complexity
2Length of stationary object
If the plasma source parameters are increased to extend the plasma, then the plasma extension distance is improved, but the energy consumption increases
Solution Approach 1:
The dielectric barrier acts as an energy-efficient intermediary that allows electrical field penetration and plasma extension without requiring proportionally high energy input. The barrier enables energy transfer through capacitive coupling, which is more efficient than direct plasma contact methods
Solution Approach 2:
RF power is applied periodically through the dielectric barrier, creating oscillating electrical fields that efficiently drive plasma extension. This periodic action allows energy to be delivered in controlled pulses, improving energy efficiency compared to continuous high-power plasma generation
3Quantity of substance
If reactive gases are used to increase reactive species concentration, then the treatment effectiveness is improved, but the harmful effects from high energy photons and electrical charges increase
Solution Approach 1:
The dielectric barrier serves as a protective intermediary that filters harmful high-energy photons and electrical charges while allowing the beneficial electrical field to pass through and maintain plasma extension. This selective filtering protects the article from harmful effects while preserving treatment effectiveness
Solution Approach 2:
The patent creates different zones with different properties: the plasma source region has high reactive species concentration for effective treatment, while the barrier region filters harmful components, and the article region receives protected plasma exposure. This spatial differentiation of qualities allows simultaneous achievement of high reactive species concentration and reduced harmful exposure
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 method enhances the concentration of reactive species at the article's surface, reducing energy photon and electrical charge exposure while maintaining a high reactant density over a large distance, thereby improving the plasma treatment efficiency.
Implementation Method 1
applying RF power to dissociate the one or more gases and create a plasma
Implementation Method 2
RF power to dissociate one or more gases in the first source and create a first plasma
Implementation Method 3
the RF grounded pathway selectively extends and concentrates a plasma in the RF grounded pathway
Data Source
AI summary
An apparatus and method to extend and concentrate a plasma from one or more plasma sources through at least one RF grounded pathway. A first embodiment of the invention involves a method to extend and concentrate a plasma. A second embodiment of the invention involves an apparatus to extend and concentrate a plasma. In some embodiments, an electrostatic rod inserted inside a RF grounded pathway assists the extension and concentration of a plasma that can treat one or more articles.