Klystron Drift Tube Spacing Structure for Thermal Stability
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Solution Overview
Problem
The existing klystron designs face instability due to heat buildup in drift tubes, which causes thermal expansion and frequency shifts, leading to unstable operation, as conventional thin supports block heat diffusion and lead to increased temperatures.
Innovation Solution
A klystron design with a cylindrical body featuring a projection for space adjustment between drift tubes, using a screw mechanism to deform the projection and maintain uniform heat dissipation, preventing excessive temperature and frequency changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a thin wall is provided for the support to adjust drift tube interval, then the position adjustment of drift tubes is enabled, but the heat diffusion from the inner wall of the drift tube is blocked, causing temperature increase
Solution Approach 1:
The support structure is designed with non-uniform thickness: a thin wall portion (thickness 0.5-2mm) at the drift tube interval adjustment location, and a thick wall portion (thickness 5-20mm) at the heat dissipation location. This local quality differentiation enables both drift tube position adjustment through the thin wall and effective heat diffusion through the thick wall, resolving the contradiction between ease of operation and temperature control.
2Stability of the object's composition
If the drift tube temperature increases due to blocked heat diffusion, then the dimensions change due to thermal expansion, but the resonance frequency becomes unstable
Solution Approach 1:
The thick wall portion of the support acts as an intermediary heat conduction path between the drift tube and the surrounding environment. It efficiently conducts heat away from the drift tube, preventing excessive temperature rise and thermal expansion, thereby maintaining both dimensional stability and resonance frequency stability, which resolves the contradiction between composition stability and operational reliability.
3Adaptability or versatility
If the support wall is made thin for space adjustment, then the drift tube interval can be modified, but the heat conduction to the surrounding direction is insufficient
Solution Approach 1:
The support employs local quality differentiation with a thin wall portion for drift tube spacing adjustment and a thick wall portion for heat conduction. The thin wall (0.5-2mm) provides adaptability for modifying drift tube intervals, while the thick wall (5-20mm) ensures efficient heat conduction, thus resolving the contradiction between adaptability and energy loss.
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 design stabilizes klystron operation by ensuring uniform heat dissipation and minimizing thermal expansion, maintaining resonance frequency stability through adjustable drift tube spacing and airtight vacuum maintenance.
Implementation Method 1
the space adjustment means presses the one support toward the projection and adjusts the space between the one and the other drift tubes by plastically deforming the projection
Implementation Method 2
the heat diffusion from the inner wall of the drift tube is blocked by the thin wall, and the heat conduction to the surrounding direction of the disk cannot occur sufficiently
Implementation Method 3
airtight vacuum maintenance
Data Source
AI summary
According to one embodiment, a klystron includes a plurality of cavity resonators arranged next to each other on a coaxial line. The cavity resonators each comprise a cylindrical body, one and another drift tubes provided on respective sides of respective ends of the cylindrical body, one and another support and a space adjustment means which adjusts the space between the one and the other drift tubes. The cylindrical body comprises a projection projecting from one end surface parallel to the axial line, and the one support is provided to abut on the projection, and the space adjustment means presses the one support toward the projection and adjusts the space between the one and the other drift tubes by plastically deforming the projection.