LINAC Phase Control via ADC Clock Delay
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Solution Overview
Problem
Monitoring and controlling the phase and frequency of analog voltages/currents in LINAC cavities is challenging due to difficulties in achieving precise temporal relationships and phase monitoring, which affects the optimal performance of ion acceleration processes.
Innovation Solution
A system comprising an analog-to-digital converter (ADC) with a clock delay generator and a controller that digitizes the analog waveform, allowing for sub-nanosecond resolution and enabling the determination of frequency and phase drift, with the controller adjusting the RF generator output to correct phase and frequency deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional analog to digital converters are used to monitor phase and frequency in LINAC cavities, then the system can detect resonance output, but the measurement precision is insufficient to achieve sub-nanosecond resolution
Solution Approach 1:
The patent introduces a clock delay generator as an intermediary device between the master clock and the ADC sampler. This generator creates a delayed version of the clock signal, and by measuring the time difference between the original and delayed clock signals relative to the analog waveform, the system achieves sub-nanosecond phase and frequency measurement precision without requiring an excessively complex high-speed ADC system
Solution Approach 2:
The patent replaces traditional high-precision analog phase detection circuitry with a digital measurement approach. By converting the analog waveform to digital form and using digital signal processing to measure phase and frequency, the system achieves high measurement precision while avoiding the complexity of ultra-precise analog timing circuitry
2Measurement precision
If the sampling rate of the ADC is increased to improve phase measurement resolution, then measurement precision improves, but the cost and complexity of the ADC increases
Solution Approach 1:
The patent changes the approach from increasing ADC sampling rate to using a clock delay generator that creates a time-delayed clock signal. By measuring the phase difference between the original and delayed clock signals, the system achieves sub-nanosecond resolution using standard ADCs with moderate sampling rates, making the system easier to manufacture and implement
3Productivity
If fixed temporal relationships are maintained between LINAC cavities to maximize acceleration effect, then ion acceleration efficiency improves, but the system becomes difficult to control and adjust
Solution Approach 1:
The patent implements a feedback system where the controller continuously monitors the phase and frequency of the analog waveform from each LINAC cavity using the clock delay generator and ADC. Based on these measurements, the controller adjusts the RF generators to maintain optimal temporal relationships between cavities, thereby maximizing ion acceleration efficiency while allowing for dynamic control and adjustment
Solution Approach 2:
The patent transitions from fixed, static temporal relationships between cavities to a dynamic control system. The controller can continuously adjust the phase and frequency of each cavity's RF generator based on real-time measurements, allowing the system to adapt to changing conditions while maintaining optimal acceleration performance
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 system achieves precise measurement and control of phase and frequency with sub-nanosecond resolution, improving the accuracy and efficiency of ion acceleration processes in LINACs by allowing for real-time adjustments and anomaly detection.
Implementation Method 1
an analog to digital converter to convert the incoming analog waveform to a digital representation
Implementation Method 2
a clock delay generator, which allows a programmable amount of delay to be introduced into the sample clock for the ADC
Implementation Method 3
The controller can then use the digitized representation to determine the frequency of the incoming analog waveform, its phase drift and its phase relative to a master clock
Implementation Method 4
a linear accelerator (or LINAC) may be used to accelerate these ions. In certain embodiments, a LINAC includes a plurality of RF cavities
Implementation Method 5
The LINAC may operate optimally when each of the RF cavities is energized at its respective resonant frequency
Data Source
AI summary
A system for measuring and controlling the phase of an incoming analog waveform is disclosed. The system comprises an analog to digital converter to convert the incoming analog waveform to a digital representation. The system also includes a clock delay generator, which allows a programmable amount of delay to be introduced into the sample clock for the ADC. The system further comprises a controller to manipulate the delay used by the clock delay generator and store the outputs from the ADC. The controller can then use the digitized representation to determine the frequency of the incoming analog waveform, its phase drift and its phase relative to a master clock. The controller can then modify the output of a RF generator in response to these determinations.