Injection Locked Magnetron Vector Control for SRF Cavities
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Solution Overview
Problem
Existing RF power sources for particle accelerators, such as vacuum tube technologies, are expensive and inefficient, lacking the necessary high degree of vector control for stable accelerating gradients, particularly in narrow band devices like Superconducting Radio Frequency (SRF) cavities.
Innovation Solution
The use of injection locked magnetrons with carrier amplitude modulation by spectral energy spreading via phase modulation provides stable output phase and high dynamic range control of amplitude, enabling efficient vector control of RF signals in SRF cavities, coupled with a digital controller module for feedback regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional vacuum tube amplifiers (triodes, tetrodes, klystrons, IOTs) are used for RF power generation, then reliable RF power output is achieved, but cost increases to $5-$25 per watt and efficiency is limited to approximately 60%
Solution Approach 1:
The patent replaces expensive, high-maintenance vacuum tube amplifiers with magnetrons that are significantly cheaper and more efficient. While magnetrons were traditionally considered less reliable for accelerator applications, the invention uses injection locking to stabilize their output, making them a viable replacement that reduces both cost and energy loss.
Solution Approach 2:
The patent fundamentally changes the operating parameters of magnetrons by applying injection locking techniques. This transforms magnetrons from unstable, free-running oscillators into devices with stable frequency and phase characteristics, enabling them to meet the stringent requirements of particle accelerator applications while maintaining their cost and efficiency advantages.
2Power
If traditional vacuum tube amplifiers are used, then sufficient power output is achieved, but vector control capability is insufficient for stable accelerating gradients in narrow band devices
Solution Approach 1:
The patent implements feedback control through injection locking, where a portion of the desired output signal is fed back to control the magnetron's oscillation. This feedback mechanism provides precise vector control of both amplitude and phase, enabling stable accelerating gradients in narrow band SRF cavities while maintaining high power output.
Solution Approach 2:
The patent replaces the traditional mechanical/vector control systems with electronic phase and amplitude modulation techniques. By using injection locking and signal processing, the system achieves precise vector control without the complexity and limitations of traditional mechanical adjustment mechanisms.
3Loss of energy
If magnetrons are used without injection locking, then cost per watt is reduced to under $10 and efficiency reaches 70%-80%, but output phase stability is insufficient for particle accelerator applications
Solution Approach 1:
The patent applies injection locking feedback to magnetrons to stabilize their output phase. A controlled signal is injected into the magnetron to lock its oscillation frequency and phase to the desired value, providing the stability required for particle accelerator applications while preserving the magnetron's high efficiency of 70%-80%.
Solution Approach 2:
The patent introduces an intermediary injection signal as a mediator between the control system and the magnetron. This intermediary signal enables precise control of the magnetron's output phase without directly modifying the magnetron's internal structure, thereby maintaining its efficiency while achieving the required stability.
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 allows for tens of megavolts per meter accelerating gradients with modest RF drive power, achieving high efficiency and stability in particle acceleration while minimizing energy dissipation in superconducting cavities.
Implementation Method 1
Magnetrons are another vacuum tube technology. Unlike the other devices listed, magnetrons are oscillators, not an amplifier. Magnetrons are the devices used in kitchen microwave ovens, industrial heating systems, and military radar applications.
Implementation Method 2
The present invention includes injection locking means used to provide a very stable output phase and provides high dynamic range control of the amplitude with additional signal conditioning as disclosed herein.
Implementation Method 3
vector control of radio frequency signals in narrow band devices such as Superconducting Radio Frequency (SRF) cavities driven by injection locked magnetrons using carrier amplitude modulation by spectral energy spreading via phase modulation
Data Source
AI summary
A method, system, and apparatus for vector control of radio frequency signals in narrow band devices such as Super-conducting Radio Frequency (SRF) cavities driven by injection locked magnetrons using carrier amplitude modulation by spectral energy spreading via phase modulation comprises coupling a magnetron to a cavity associated with a particle accelerator and injection locking the magnetron. A modulated amplitude and modulated phase of a drive signal is provided to the magnetron powering the cavity associated with the particle accelerator by removing power from a carrier according to a modulation scheme and providing vector control of the cavity radio frequency vector.