Standing Wave Linear Accelerator Envelope Signal Control
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Solution Overview
Problem
Existing Automatic Frequency Control (AFC) systems for standing wave linear accelerators, such as phase-locked frequency detection and minimum reflected wave systems, face issues with complex structures, poor reliability, and difficulty in debugging, as well as limited control capabilities, especially when the reflected wave enters a total reflection state.
Innovation Solution
A system and method that utilize a main processor to receive and process envelope signals from a standing wave linear accelerator, determining the rotation direction of a motor based on amplitude thresholds and digital pulse current signals, with pre-processors to generate and filter signals, allowing for precise control of the microwave power source and motor position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a phase-locked frequency detection AFC system is used, then frequency control capability is improved, but system complexity and debugging difficulty increase
Solution Approach 1:
The patent replaces the traditional microwave circuit-based phase-locked frequency detection system with a digital signal processing approach. The envelope detector extracts amplitude information from the reflected wave, and a digital processor implements the frequency control algorithm, substituting complex analog microwave circuits with simpler digital electronics while maintaining frequency control precision.
Solution Approach 2:
The patent extracts only the envelope (amplitude) information from the reflected wave signal using an envelope detector, discarding the phase information. This extraction approach simplifies the system by focusing only on the necessary parameter for frequency control, avoiding the need for complex phase measurement and processing circuits.
2Device complexity
If a minimum reflected wave AFC system is used, then system simplicity is improved, but control capability deteriorates when total reflection occurs
Solution Approach 1:
The patent implements a feedback control system where the envelope detector continuously monitors the reflected wave amplitude, and the digital processor adjusts the magnetron frequency based on the error between the measured envelope and the target minimum. This closed-loop feedback ensures reliable control even during total reflection events by continuously correcting frequency deviations.
Solution Approach 2:
The patent changes the control parameter from direct phase measurement or raw reflected wave amplitude to the envelope of the reflected wave. This parameter transformation provides a more stable and reliable control signal that maintains effectiveness across different operating conditions, including total reflection states where traditional methods fail.
3Measurement precision
If complex microwave circuits are used, then frequency detection precision is improved, but reliability and stability worsen
Solution Approach 1:
The patent substitutes complex microwave circuits with digital signal processing components. The envelope detector and digital processor provide frequency detection functionality with improved reliability, as digital systems are less susceptible to environmental factors like temperature drift, humidity, and electromagnetic interference that affect analog microwave circuits.
Solution Approach 2:
The patent employs simpler, more robust electronic components (envelope detector, digital processor) that are easier to manufacture, more reliable, and less maintenance-intensive than complex microwave circuits. While the detection precision is maintained through algorithmic processing, the hardware becomes more durable and stable in various operating conditions.
Data Source
AI summary
Embodiments of the disclosed technology provide an apparatus for controlling a standing wave linear accelerator. An example standing wave linear accelerator includes an accelerating tube, a motor, and a microwave power source connected between the accelerating tube and the motor. An example apparatus includes a main processor configured to receive an envelope signal of a reflected wave signal output by the accelerating tube, determine whether an amplitude of the envelope signal is greater than an envelope threshold, and if it is determined that the amplitude of the envelope signal is less than the envelope threshold, determine whether to change a rotation direction of the motor by comparing the amplitude of the envelope signal with an envelope reference signal stored in a memory. The memory is connected to the main processor and is configured to store the envelope threshold and the envelope reference signal.