RF Window Temperature Control in Immersed Antenna Ion Sources
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Solution Overview
Problem
The dielectric window in plasma-based ion sources experiences significant temperature variations due to lack of cooling, leading to non-uniform environmental conditions within the plasma chamber, which negatively impacts the quality of the ion beam extracted.
Innovation Solution
A temperature regulation system is integrated into the ion source, monitoring the dielectric enclosure's temperature and adjusting the gas flow and heating/cooling through conductive antennas to maintain temperature uniformity within the plasma chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the dielectric window is not cooled, then the system structure remains simple, but temperature variations occur leading to non-uniform environmental conditions
Solution Approach 1:
The patent combines the antenna structure with the temperature regulation function by integrating heating elements directly into the antenna assembly. The antenna serves dual purposes: generating electromagnetic fields for plasma ignition and providing temperature control to the dielectric window, thereby reducing overall system complexity while achieving temperature uniformity.
Solution Approach 2:
The antenna assembly is designed to perform multiple functions simultaneously: plasma generation through inductive coupling and temperature regulation of the dielectric window. This multi-functionality eliminates the need for separate cooling systems, maintaining structural simplicity while solving the temperature uniformity problem.
2Temperature
If water cooling systems are used for the dielectric window, then temperature uniformity is improved, but the system complexity and structural modifications increase
Solution Approach 1:
The patent merges the temperature control function with the existing antenna structure by integrating heating elements into the antenna assembly. This approach avoids the need for separate water cooling systems and their associated manifolds, channels, and connection points, thereby maintaining ease of manufacture while achieving temperature uniformity.
Solution Approach 2:
The patent uses gas flow through the dielectric window for temperature regulation instead of liquid water cooling systems. This pneumatic approach simplifies the manufacturing process by eliminating complex water channel integration while still achieving effective temperature control and uniformity.
3Stability of the object's composition
If the dielectric window is cooled, then environmental uniformity is improved, but the ion beam quality deteriorates due to structural modifications
Solution Approach 1:
The patent combines plasma generation and temperature control functions within the antenna assembly, allowing precise control of the dielectric window temperature without introducing external cooling structures that could disrupt plasma uniformity. This integrated approach maintains environmental uniformity while preserving ion beam quality.
Solution Approach 2:
The patent controls temperature by adjusting the power delivered to the heating elements in the antenna assembly, enabling precise regulation of the dielectric window temperature. This parameter-based control allows optimization of both environmental uniformity and ion beam quality without structural modifications.
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 achieves improved temperature uniformity within the plasma chamber, enhancing the quality of the ion beam extracted and maintaining existing system configurations without significant structural alterations.
Implementation Method 1
a plurality of conductive antennas extending through the dielectric enclosure, the conductive antennas having respective gas ports formed therein for delivering a gas into the dielectric enclosure
Implementation Method 2
A temperature regulation system is integrated into the ion source, monitoring the dielectric enclosure's temperature and adjusting the gas flow and heating/cooling through conductive antennas to maintain temperature uniformity within the plasma chamber
Implementation Method 3
adjusting the gas flow and heating/cooling through conductive antennas to maintain temperature uniformity
Data Source
AI summary
A processing system including an ion source having a plasma chamber to house a plasma, an extraction assembly, disposed along a side of the plasma chamber, and including at least one extraction aperture, and an antenna assembly extending through the plasma chamber. The antenna assembly may include a dielectric enclosure and a plurality of conductive antennas extending through the dielectric enclosure, the conductive antennas having respective gas ports formed therein for delivering a gas into the dielectric enclosure. The processing system may further include a temperature regulation system coupled to the conductive antennas and to the dielectric enclosure for monitoring a temperature of the dielectric enclosure and regulating the gas delivered to the conductive antennas for regulating the temperature of the dielectric enclosure.