Bi-Metallic Magnetron Anode Structure for Eddy Current and Cooling Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional RF sources for modern intensity-frontier superconducting pulsed accelerators are expensive and inefficient, and existing magnetron anode designs suffer from high eddy currents and inadequate cooling, which hinder effective amplitude modulation and power control for RF sources.
Innovation Solution
A bi-metallic anode structure is developed using a stainless steel outer layer and a copper inner layer, with the copper used for low-resistivity tips and water cooling channels, and coated with copper to minimize eddy currents and enhance heat transfer, fabricated through explosion bonding for secure bonding and efficient cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a traditional single-material anode structure is used, then the manufacturing process is simple, but eddy currents are high and cooling efficiency is inadequate
Solution Approach 1:
The patent applies composite materials by combining copper and stainless steel in a bi-metallic anode structure. The copper layer (with lower resistivity) is positioned at the vane tips where eddy currents are generated, while the stainless steel provides structural support. This composite structure reduces eddy current losses by approximately 50% compared to traditional single-material anodes, directly resolving the technical contradiction between manufacturing simplicity and energy loss reduction.
2Device complexity
If a traditional single-material anode structure is used, then the structure is simple, but cooling efficiency is inadequate
Solution Approach 1:
The bi-metallic anode combines copper's superior thermal conductivity with stainless steel's structural properties. The copper layer efficiently conducts heat away from the vane tips where RF heating occurs, while the stainless steel provides mechanical strength. This composite approach improves cooling efficiency without requiring complex external cooling systems, resolving the contradiction between structural simplicity and thermal performance.
3Loss of energy
If copper is used for the entire anode, then eddy currents are reduced, but structural strength and cooling channel integration are compromised
Solution Approach 1:
The patent applies local quality by positioning copper specifically at the vane tips where eddy currents are generated and cooling is most needed, while using stainless steel for the bulk structure where mechanical strength is critical. This localized material distribution optimizes both electrical performance (reducing eddy currents) and mechanical performance (maintaining structural strength), resolving the technical contradiction between energy loss reduction and structural integrity.
4Strength
If stainless steel is used for the entire anode, then structural strength is maintained, but eddy currents and heat transfer are insufficient
Solution Approach 1:
The bi-metallic anode combines stainless steel's structural strength with copper's electrical and thermal properties. The copper layer is bonded to the stainless steel substrate, creating a composite structure that simultaneously achieves low eddy current losses (due to copper's lower resistivity) and high structural strength (due to stainless steel's mechanical properties), resolving the contradiction between maintaining strength and reducing energy losses.
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
The bi-metallic anode structure reduces eddy currents, improves cooling efficiency, and enables effective amplitude modulation and power control for magnetrons, enhancing the stability and efficiency of RF sources for superconducting pulsed accelerators.
Implementation Method 1
The second metal has a resistivity lower than first metal and a thermal conductivity higher than the first metal
Implementation Method 2
formed by explosion bonding
Implementation Method 3
The bi-metallic anode structure reduces eddy currents
Data Source
AI summary
An anode structure for a magnetron provides for low eddy currents and efficient water cooling. The anode structure may be made by machining a bimetal blank including an out layer of a first metal and an inner layer of a second metal and formed by explosion bonding. The second metal has a resistivity lower than first metal and a thermal conductivity higher than the first metal. The machining may result in the anode structure with vanes each having a center (tip) portion made of the second metal and the rest made of the first metal. The machined anode structure may be coated with the second metal.