L-Shaped RF Coupler with Insulated Cooling Passage
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Solution Overview
Problem
Existing radio frequency couplers require additional space for the protruding portion of the waveguide, which limits their compactness due to the need to avoid crossing the radio frequency transmission space with a metal passage tube.
Innovation Solution
A radio frequency coupler design featuring a waveguide with an L-shaped bend and a refrigerant passage part where the passage tube, exposed to the radio frequency transmission space, is made of an insulator, allowing the waveguide to be bent towards the acceleration cavity without branching, thus saving space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a T-shaped waveguide is used to prevent the passage tube from crossing the radio frequency transmission space, then the radio frequency transmission is protected, but additional space is required for the protruding portion
Solution Approach 1:
The waveguide is bent in an L-shape at a bend section, changing the spatial arrangement from a T-shaped configuration to an L-shaped configuration. This dimensional change allows the passage tube to penetrate from the outside of the waveguide toward the acceleration cavity side without requiring a protruding portion, thereby reducing space requirements while maintaining the integrity of the radio frequency transmission space
Solution Approach 2:
An insulator is introduced as an intermediary material for the portion of the passage tube exposed to the radio frequency transmission space. This insulator allows the passage tube to cross the radio frequency transmission space without causing harmful electromagnetic interference, eliminating the need for a T-shaped waveguide configuration and reducing space requirements
2Strength
If the passage tube is made of metal to ensure structural strength, then the mechanical strength is improved, but the passage tube cannot cross the radio frequency transmission space
Solution Approach 1:
The passage tube is constructed with different materials for different portions: a metal portion for the part requiring structural strength (inside the acceleration cavity) and an insulator portion for the part exposed to the radio frequency transmission space. This local differentiation of material properties allows the passage tube to maintain mechanical strength while avoiding electromagnetic interference with the radio frequency transmission
Solution Approach 2:
The passage tube is formed as a composite structure combining metal and insulator materials. The metal portion provides the necessary structural strength and thermal conductivity for cooling, while the insulator portion prevents electromagnetic interference with the radio frequency transmission space, allowing the passage tube to cross the transmission space without requiring complex waveguide configurations
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 design enables a space-saving configuration by avoiding the need for a protruding portion on the opposite side of the acceleration cavity, allowing the waveguide to be formed in an L shape while maintaining effective cooling of the inner conductor tip portion.
Implementation Method 1
cooling is performed by causing a refrigerant to flow through the passage tube
Implementation Method 2
causing a refrigerant to flow through the passage tube
Implementation Method 3
a portion of the passage tube, which is exposed to a radio frequency transmission space which is formed between the outer conductor and the inner conductor, being formed of an insulator
Data Source
Figure 1
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Figure 4
AI summary
A high-speed coupler comprises: a waveguide having an outer conductor and an inner conductor provided in a coaxial tube shape, the waveguide extending in a straight line from a power-supply side, being bent in an L shape at a bend section, and extending in a straight line toward an acceleration cavity; and a refrigerant passage part that passes through the outer conductor and the inner conductor at the bend section from the outside of the waveguide toward the acceleration cavity and is connected to the interior of the inner conductor, the refrigerant passage part having a passage tube through which refrigerant is caused to pass between the inner part of the tip on the acceleration cavity side of the inner conductor, and the outer part of the waveguide, and the portion of the passage tube that is exposed to a high-frequency transmission space formed between the outer conductor and the inner conductor being formed of an insulator.