Thermal Barrier for Charged Particle Beam Drift Control
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Solution Overview
Problem
Charged particle beam systems experience thermal drift due to heat transfer between objective coils and the specimen chamber, leading to inaccurate beam positioning in microfabrication and microscopy applications, which existing methods fail to adequately address.
Innovation Solution
A temperature-controlled device is placed between the lens system and the sample chamber to regulate heat transfer, maintaining a constant temperature and reducing thermal drift by using a high thermal conductivity disc connected to an external heating/cooling system, thereby stabilizing the sample chamber temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If objective coils are positioned in close proximity to the sample chamber to enable effective beam focusing, then beam focusing capability is improved, but thermal drift increases due to heat transfer between coils and sample chamber
Solution Approach 1:
The patent divides the thermal management system into separate functional zones: the objective lens coils remain in close proximity to the sample chamber for effective beam focusing, while a distinct temperature-controlled device (thermal barrier) is positioned between the coils and sample chamber to manage heat transfer. This segmentation allows simultaneous optimization of both beam focusing capability and thermal stability.
Solution Approach 2:
The patent introduces a temperature-controlled device as an intermediary element positioned between the objective lens coils and the sample chamber. This thermal barrier acts as a mediator that selectively controls heat transfer, allowing the coils to operate at higher temperatures for effective focusing while preventing excessive heat from reaching the sample chamber, thereby reducing thermal drift.
2Manufacturing precision
If temperature-controlled device is added to reduce thermal drift, then beam positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The temperature-controlled device serves multiple functions simultaneously: it acts as a thermal barrier to reduce heat transfer, provides a stable thermal reference for the sample chamber, and can be integrated with existing cooling systems. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent modifies the thermal parameters of the system by introducing a controllable thermal barrier with adjustable temperature. By changing the temperature parameter of this intermediary device, the system can dynamically control heat transfer rates, providing a simple mechanism to address thermal drift without requiring complex structural modifications.
3Manufacturing precision
If conventional thermal isolation methods are used, then thermal drift is reduced, but power consumption increases and expensive power supplies are required
Solution Approach 1:
The patent employs a temperature-controlled device that can be integrated with standard, readily available cooling systems rather than requiring expensive, high-precision power supplies. This approach uses more common, cost-effective thermal management components to achieve the required thermal stability, reducing both equipment cost and power consumption.
Solution Approach 2:
The patent acknowledges that the objective lens coils inherently generate heat, but instead of viewing this as purely harmful, the system uses the temperature-controlled device to manage and utilize this thermal energy. By controlling the thermal barrier temperature, the system can dissipate heat efficiently without requiring excessive cooling power, converting the thermal challenge into a manageable parameter.
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 approach significantly reduces thermal drift, minimizing power consumption and eliminating the need for expensive power supplies, while maintaining precise beam positioning and reducing wait times for data collection.
Implementation Method 1
A temperature-controlled device is placed between the lens system and the sample chamber to regulate heat transfer
Implementation Method 2
using a high thermal conductivity disc connected to an external heating/cooling system, thereby stabilizing the sample chamber temperature
Data Source
AI summary
A method and apparatus for reducing drift in a charged particle beam system. The method includes providing a charged particle beam column including a charged particle beam, a lens system, and a sample chamber; disposing a temperature-controlled device between the lens system and the sample chamber to control heat transfer between the lens system and the sample chamber; and controlling the temperature of the temperature-controlled device to reduce or eliminate the thermal drift of the position of a sample within the sample chamber relative to the position of the charged particle beam.