Plasma Ion Source Insulation via Flow Restrictor
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Solution Overview
Problem
Conventional plasma ion sources face challenges in maintaining desired insulation properties without increasing the overall size of the apparatus, which leads to higher costs and longer vacuuming and gas replacement times, especially when dealing with different gas types and increased electrode distances.
Innovation Solution
A plasma ion source design featuring a gas introduction chamber, a plasma generation chamber, a high-frequency coil, and an electrode with through-holes smaller than the plasma sheath length, along with an insulation member, to maintain high conductance and prevent plasma intrusion, thus ensuring a desired insulation property without enlarging the apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between electrodes is increased to ensure insulation, then insulation property is improved, but the size of the plasma ion source increases
Solution Approach 1:
The patent introduces a flow restrictor as an intermediary component between the gas supply and plasma generation chamber. This flow restrictor creates a pressure drop that suppresses arc discharge, thereby providing insulation functionality without requiring increased electrode distance or apparatus size.
Solution Approach 2:
The patent changes the pressure parameter by introducing a flow restrictor that creates a localized pressure drop. By controlling the pressure differential across the plasma generation chamber, the system achieves insulation against arc discharge while maintaining compact dimensions.
2Reliability
If the pressure of gas is increased to ensure insulation, then insulation property is improved, but the time required for vacuuming and gas replacement increases
Solution Approach 1:
The flow restrictor acts as a mediator that enables insulation at lower pressures. By creating a pressure drop specifically at the restrictor location rather than throughout the entire chamber, the system achieves arc discharge suppression without requiring high overall gas pressure, thus reducing vacuuming and gas replacement times.
Solution Approach 2:
The patent locally changes the pressure parameter at the flow restrictor location while maintaining lower overall chamber pressure. This localized parameter change achieves the insulation effect without the penalty of increased vacuuming time associated with high overall pressure.
3Reliability
If the distance between electrodes is increased to prevent discharge, then insulation property is improved, but the cost of configuration increases
Solution Approach 1:
Instead of increasing electrode distance or using complex insulation structures, the patent employs a simple flow restrictor as an intermediary component. This cost-effective solution achieves arc discharge suppression through pressure control rather than through increased physical separation or expensive insulation materials.
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 effectively prevents the increase in size of the plasma ion source, maintains desired insulation properties, and reduces the time required for vacuuming and gas replacement, even when using multiple gas types, by optimizing the pressure and distance between electrodes based on Paschen's Law.
Implementation Method 1
a coil that is wound along an outer circumference of the plasma generation chamber and to which high-frequency power is applied
Implementation Method 2
a size of the through-holes is smaller than a length of a plasma sheath
Data Source
AI summary
A plasma ion source includes: a gas introduction chamber, into which raw gas is introduced; an insulation member provided in the gas introduction chamber; a plasma generation chamber connected to the gas introduction chamber; a coil that is wound along an outer circumference of the plasma generation chamber and to which high-frequency power is applied; and an electrode arranged at a boundary between the gas introduction chamber and the plasma generation chamber and having a plurality of through-holes formed therein, wherein a size of the through-holes is smaller than a length of a plasma sheath.