Isothermal Ion Source Heating for Uniform Beam Output
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Solution Overview
Problem
Existing ion sources face inefficiencies due to frequent shutdowns for cleaning, non-uniform ion beams, and temperature gradients leading to condensation and reduced operational consistency.
Innovation Solution
Incorporation of auxiliary heaters and thermocouples for closed-loop control to balance heat, combined with water-cooling and reflector electrodes to maintain uniform temperature and gas density, reducing temperature gradients and condensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the ion source operates continuously without temperature control, then productivity increases, but temperature gradients cause condensation and non-uniform ion beams reducing reliability
Solution Approach 1:
The patent applies parameter changes by introducing auxiliary heaters that modify the thermal parameters of the chamber. These heaters adjust the temperature distribution dynamically to maintain uniformity across the chamber volume, preventing condensation and ensuring consistent ion beam quality during continuous operation.
Solution Approach 2:
The patent implements feedback control through thermocouples positioned at multiple locations within the chamber. These sensors continuously monitor temperature gradients and provide feedback to the control system, which adjusts the auxiliary heater power accordingly to maintain uniform temperature distribution and prevent condensation formation.
2Manufacturing precision
If auxiliary heaters are added to balance temperature, then manufacturing precision of ion beam improves, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the heating function into multiple auxiliary heaters positioned at different locations within the chamber. This segmentation allows independent control of temperature in different regions, enabling precise compensation of local temperature gradients while maintaining overall system manageability.
Solution Approach 2:
The patent implements local quality by placing auxiliary heaters and thermocouples at specific strategic locations within the chamber based on identified temperature gradient patterns. This targeted approach applies heating and monitoring only where needed, improving ion beam uniformity without requiring complete system-wide modification.
3Productivity
If the filament emits electrons for ionization, then ion production efficiency increases, but heat generation creates temperature gradients leading to condensation
Solution Approach 1:
The patent converts the harmful effect of filament-generated heat into a beneficial control parameter. By introducing auxiliary heaters that can add controlled heat to specific regions, the system uses thermal energy management to counteract the temperature gradients caused by the filament, transforming a harmful side effect into a controllable variable.
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
Enables continuous operation for several days with consistent plasma uniformity and reduced contamination, enhancing production efficiency and ion beam quality.
Implementation Method 1
a source filament at the first end of the chamber and the ion source configured to emit electrons
Implementation Method 2
one or more heaters positioned within the chamber and between the second end and the beam aperture and operable to provide a second amount of heat
Implementation Method 3
a water-cooling system. The support posts extend from the chamber to the water-cooling system which is configured to remove heat from the plurality of support posts
Implementation Method 4
a reflector electrode at the second end of the chamber and configured to reflect the electrons away from the second end
Data Source
AI summary
An ion source includes a chamber having a first end, a second end opposite the first end, a first wall extending from the first end to the second end, and a second wall opposite the first wall. The ion source also includes a source filament at the first end of the chamber and configured to emit electrons and a first amount of heat, a beam aperture at the second wall of the chamber, and one or more heaters positioned within the chamber and between the second end and the beam aperture and operable to provide a second amount of heat. The one or more heaters are positioned and operable such that the second amount of heat balances the first amount of heat to reduce or eliminate a temperature gradient in the chamber.