Synchrocyclotron RF Frequency Matching by Phase Feedback
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Solution Overview
Problem
In particle accelerators like cyclotrons, the acceleration of charged particles becomes non-uniform due to relativistic mass increase, leading to asynchronous arrival at the gap with the applied voltage peaks, which existing technologies like isochronous and synchrocyclotrons partially address but with limitations.
Innovation Solution
A synchrocyclotron system with magnetic yokes defining a resonant cavity, a voltage-controlled oscillator, and feedback circuitry to match the frequency of the input voltage to the resonant frequency, using a phase detector and control circuit to adjust the frequency of the input voltage, and a tunable resonant circuit to maintain resonance over a broad frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the frequency of the input voltage is kept constant, then the device complexity is reduced, but the acceleration uniformity deteriorates due to relativistic mass increase
Solution Approach 1:
The patent applies dynamics by making the frequency of the input voltage dynamically adjustable rather than fixed. The frequency is varied in real-time to match the changing resonant frequency of the cavity as particles gain energy and their orbital period changes, thereby maintaining uniform acceleration despite relativistic mass increase.
Solution Approach 2:
The patent employs feedback through a phase detector that monitors the phase difference between the input voltage and the cavity response. This feedback signal is used to adjust the frequency of the input voltage, ensuring it continuously matches the resonant frequency of the cavity, thus resolving the contradiction between constant frequency simplicity and acceleration uniformity.
2Stability of the object's composition
If the frequency of the input voltage is varied to match relativistic mass increase, then the acceleration uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent employs feedback through a phase detector that monitors the phase difference between the input voltage and the cavity response. This feedback signal is used to adjust the frequency of the input voltage, ensuring it continuously matches the resonant frequency of the cavity, thus resolving the contradiction between constant frequency simplicity and acceleration uniformity.
Solution Approach 2:
The system achieves self-service by using the cavity's own resonant response to generate the feedback signal needed for frequency adjustment. The phase detector utilizes the cavity's natural resonance characteristics to automatically regulate the input frequency, reducing the need for external complex control mechanisms.
3Adaptability or versatility
If a broad frequency range is covered, then the adaptability is improved, but the loss of energy increases due to frequency mismatch
Solution Approach 1:
The feedback mechanism continuously adjusts the input voltage frequency to match the cavity's resonant frequency across the broad frequency range. This ensures that energy transfer remains efficient throughout the frequency sweep, preventing energy loss that would occur with static frequency settings.
Solution Approach 2:
By dynamically adjusting the frequency to follow the cavity's resonant frequency as it sweeps through a broad range, the system maintains optimal energy transfer efficiency at each moment, thereby achieving both broad adaptability and minimal 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
Ensures uniform acceleration of charged particles by dynamically matching the resonant frequency of the cavity to the input voltage frequency, effectively addressing the non-uniform acceleration caused by relativistic mass increase, thereby maintaining efficient energy transfer and beam focus.
Implementation Method 1
a resonant frequency of the resonant cavity that changes over time
Implementation Method 2
a source to provide an input voltage to the resonant cavity, the source comprising a voltage controlled oscillator (VCO)
Implementation Method 3
The feedback circuitry may comprise a phase detector to detect a phase difference between the frequency of the input voltage and the resonant frequency
Implementation Method 4
A cyclotron accelerates charged particles in an axial magnetic field by applying an alternating voltage to one or more dees in a vacuum chamber
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A synchrocyclotron includes magnetic structures that define a resonant cavity, a source to provide particles to the resonant cavity, a voltage source to provide radio frequency (RF) voltage to the resonant cavity, a phase detector to detect a difference in phase between the RF voltage and a resonant frequency of the resonant cavity that changes over time, and a control circuit, responsive to the difference in phase, to control the voltage source so that a frequency of the RF voltage substantially matches the resonant frequency of the resonant cavity.