Standing Wave Linear Accelerator Quick Beam Emission
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Solution Overview
Problem
Conventional standing wave electron linear accelerators have a long time delay from emitting a beam instruction to achieving stable X-ray dosage output, making them unsuitable for applications requiring quick responsiveness, such as rapid container inspection systems.
Innovation Solution
The microwave power system operates independently before the electron gun power system, allowing the accelerator to generate a stable X-ray beam within 100 ms by separating high voltage applying instructions and beam emitting instructions, with the electron gun power supply controlling the emission process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional standing wave accelerator system uses soft startup and AFC frequency stabilization loops, then the system achieves stable X-ray dosage output, but the time delay from beam emitting instruction to stable output becomes too long (0.5-5 seconds)
Solution Approach 1:
The microwave power system is activated in advance to pre-heat the accelerating tube and establish the electromagnetic field before the electron beam is emitted. This preliminary action reduces the time required for the AFC loop to stabilize the frequency when the beam is actually needed, thereby decreasing the overall time delay while maintaining stable X-ray dosage output.
Solution Approach 2:
The system is divided into two independent power systems: the microwave power system and the electron gun power system. The microwave power system operates independently to prepare the accelerating field, while the electron gun system is triggered only when beam emission is required. This segmentation allows the microwave system to pre-stabilize without waiting for the beam instruction, reducing the time delay while ensuring reliable stable output when needed.
2Reliability
If the accelerator system uses repeated frequency operation with high microwave power, then the characteristic frequency stability is maintained through AFC, but the temperature change of the accelerating tube causes frequency variation
Solution Approach 1:
The microwave power system is activated in advance to gradually heat the accelerating tube to its operating temperature before electron beam emission begins. This preliminary thermal conditioning reduces thermal shock and minimizes frequency drift during actual beam operation, allowing the AFC system to maintain better frequency stability despite temperature changes.
Solution Approach 2:
The AFC (automatic frequency control) system continuously monitors the characteristic frequency of the accelerating tube and provides real-time feedback adjustment to the microwave source. This feedback mechanism compensates for frequency variations caused by temperature changes, maintaining stable operation during repeated high-power frequency cycles.
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 enables rapid and precise control of X-ray beam emission, enhancing inspection efficiency and safety by allowing continuous and rapid vehicle inspection, reducing inspection time from minutes to seconds, and enabling precise dosage control for medical applications.
Implementation Method 1
a microwave device (12) having a magnetron configured to generate microwave
Implementation Method 2
an accelerating device (17) configured to receive the microwave generated by the microwave device and form a microwave electric field, to accelerate electron beams
Implementation Method 3
an electron beam emitting device configured to emit electron beam; the electron gun pulse power supply generates an electron gun pulse with the electron gun triggering pulse
Implementation Method 4
to accelerate electron beams generated from the electron beam emitting device and undertake the accelerated electron beam targeting to emit X ray beam
Data Source
AI summary
The present invention discloses a standing wave linear accelerator, comprising: a microwave device configured to generate microwave; an electron beam emitting device configured to emit electron beam; an accelerating device configured to receive the microwave generated by the microwave device and form a microwave electric field, to accelerate electron beams generated from the electron beam emitting device and undertake the accelerated electron beam targeting to emit X ray beam; a synchronous device generating synchronous pulse signal; and a quick beam emitting device receiving the synchronous pulse signal generated by the synchronous device, wherein the microwave device runs and generates microwave in advance before the operation of the electron beam emitting device based on the synchronous pulse signal, and the quick beam emitting device drives the electron beam emitting device to emit electron beam after power of the microwave generated by the microwave device reaches stable state, so that the accelerating device emits X ray beam. In the accelerator, the microwave system and the electron beam emitting device do not work at the same time, and the accelerator electron beam emitting system is started only when the AFC is put into operation and runs stably.