Plasma Processing Gas Mixing Bending Portion
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Solution Overview
Problem
In plasma processing apparatuses, mixing gases with significantly different molecular weights, such as a main gas and an adjustment gas, poses challenges due to inadequate mixing time, leading to variations in gas concentration and compromised processing uniformity, especially when a compact design is desired.
Innovation Solution
Incorporating a bending portion within the gas pipe where the main and adjustment gases are mixed, effectively lengthening the gas flow path to ensure complete mixing before introduction into the processing chamber, thereby preventing concentration variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the branch pipe length is increased to allow complete mixing of gases with different molecular weights, then gas concentration uniformity is improved, but the apparatus size increases and flow rate control responsiveness deteriorates
Solution Approach 1:
The gas pipe is designed with a bending portion that creates a curved flow path. This curvature increases the effective mixing length within the same physical space, allowing gases to mix more thoroughly without extending the linear distance. The curved path promotes better gas mixing by increasing contact time and turbulence while maintaining a compact apparatus footprint.
Solution Approach 2:
Instead of extending the pipe in a straight line (one dimension), the bending portion utilizes three-dimensional spatial arrangement to create a longer flow path within a compact volume. This transforms the mixing problem from a linear extension issue to a spatial configuration issue, achieving complete mixing without increasing the overall apparatus length.
2Manufacturing precision
If the branch pipe length is increased to allow complete mixing of gases, then processing uniformity is improved, but flow rate control responsiveness deteriorates
Solution Approach 1:
The bending portion creates a curved flow path that enhances mixing efficiency within a shorter physical length. This allows the system to achieve complete gas mixing (improving processing uniformity) without excessively lengthening the pipe, thereby maintaining faster pressure response for flow rate control.
3Manufacturing precision
If the branch pipe length is increased to allow complete mixing, then gas concentration uniformity is improved, but device compactness deteriorates
Solution Approach 1:
The curved bending portion allows the gas pipe to achieve a longer effective mixing length within a compact three-dimensional space. This enables complete gas mixing (improving concentration uniformity) while maintaining apparatus compactness, as the curved path utilizes vertical and lateral space rather than requiring linear extension.
Solution Approach 2:
The bending portion transforms the mixing path from a linear one-dimensional extension to a three-dimensional spatial configuration. This allows the apparatus to achieve complete gas mixing without increasing its overall footprint or volume, maintaining compactness while improving mixing efficiency.
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 solution ensures uniform gas concentration and improved processing uniformity by providing sufficient reaction time for complete mixing of gases with different molecular weights, even in a compact apparatus design.
Implementation Method 1
mixing gases with significantly different molecular weights, such as a main gas and an adjustment gas, poses challenges due to inadequate mixing time
Implementation Method 2
lengthening the gas flow path to ensure complete mixing before introduction into the processing chamber
Data Source
AI summary
A plasma processing apparatus includes an upper electrode arranged at a processing chamber and including a plurality of gas supplying zones, a branch pipe including a plurality of branch parts, an addition pipe connected to at least one of the branch parts, and a plurality of gas pipes that connect the branch parts to the gas supplying zones. The upper electrode supplies a processing gas including a main gas to the processing chamber via the gas supplying zones. The branch pipe divides the processing gas according to a predetermined flow rate ratio and supplies the divided processing gas to the gas supplying zones. The addition pipe adds an adjustment gas. A gas flow path of the gas pipe connected to the branch part to which the addition pipe is connected includes a bending portion for preventing a gas concentration variation according to an adjustment gas-to-main gas molecular weight ratio.