Curved Additive Manufactured Cooling Channels for RF Cavity Thermal Management
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Solution Overview
Problem
Existing RF accelerating structures face challenges in thermal management due to non-uniform and inefficient cooling methods, leading to hot spots and reduced beam quality, particularly in high-duty factor applications, where conventional cooling channels with sharp angles and brazed components hinder effective heat extraction.
Innovation Solution
The RF accelerator features a conductive housing with a homogeneous, curved cooling channel system fabricated using metal additive manufacturing, ensuring gentle flow direction changes and increased surface roughness for turbulent fluid flow, eliminating the need for brazing and providing enhanced cooling uniformity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional cooling channels with sharp angles are used, then the housing structure can be cooled, but the cooling uniformity is poor and hot spots occur
Solution Approach 1:
The cooling channels are designed with curved configurations instead of sharp angles, allowing coolant to flow smoothly through the housing structure. This curvature eliminates flow discontinuities and ensures uniform heat extraction across all regions of the RF accelerator, preventing hot spot formation while maintaining structural integrity.
2Ease of manufacture
If brazed components are used to form cooling channels, then the housing can be assembled, but the homogeneity of the structure is reduced and cooling efficiency decreases
Solution Approach 1:
The cooling channels are integrated directly into the housing structure as a unified component rather than being assembled from separate brazed parts. This merging of the channel system with the housing eliminates brazed joints, ensures homogeneous material composition throughout, and maintains consistent thermal and mechanical properties across the entire structure.
Solution Approach 2:
The manufacturing method is changed from conventional brazing to additive manufacturing, which enables the creation of complex curved cooling channels within a homogeneous housing structure. This parameter change in the manufacturing process allows for both assembly capability and structural homogeneity to be achieved simultaneously.
3Loss of energy
If water flow channels are provided in the housing, then heat can be extracted, but the flow path creates discontinuities that slow fluid flow and reduce cooling rate
Solution Approach 1:
The cooling channels are designed with smooth curved paths that guide coolant flow through the housing without sharp angles or discontinuities. This curved configuration maintains high fluid flow speed by eliminating flow separation and turbulence, while still providing sufficient surface area for effective heat extraction from the RF accelerator structure.
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 configuration enhances cooling uniformity and heat extraction rates, reducing hot spots and improving the overall performance and reliability of the RF accelerator by maintaining a constant metal thickness and minimizing gradient discontinuities in the cooling channels.
Implementation Method 1
A flow path through which coolant flows to forcibly cool the conductive housing is configured to extend through the housing
Implementation Method 2
forcing water to flow through the channels in combination with cooling the water on the outside of the housing by conventional heat dissipation means such as by radiator
Implementation Method 3
increased surface roughness for turbulent fluid flow
Data Source
AI summary
In an electron accelerator, a conductive housing defines a cavity. Photoelectrons are emitted from a photocathode into the cavity when light is applied to the photocathode. Via an opening formed in a wall of the conductive housing, the photoelectrons are output to the outside of the cavity. Coolant is flowed through a flow path formed in the wall of the conductive housing, to suppress a temperature rise of the conductive housing. The wall of the conductive housing is made by a metal additive manufacturing technique in such a way as to produce a flow path that has a gentle trajectory without discontinuities in gradient.