Experimental study on domestic C-band miniaturized accelerator
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摘要: 为了在国产化配套条件下，开展C波段小型化加速器整机技术研究，中国工程物理研究院应用电子学研究所在研制出了多种C波段小型化驻波加速管的基础上，建立了以国产零部件（磁控管、环形器、高压电源等）为主要构件的C波段加速器X射线源整机系统，并进一步利用该加速器X射线源整机系统作为测试平台，开展了大功率热测实验工作。在热测实验中，按照国标《GB/T 20129-2015无损检测用电子直线加速器》规定的测试原理和方法，测试了加速器的主要性能指标：利用钢衰减法测试了加速器的能量、利用“三明治”测试了加速器的焦点尺寸等。最终的测试结果表明，加速器焦点尺寸约为1.2 mm，加速器的能量在3～4 MeV范围可实现连续可调，20 min内加速器的剂量率波动小于±3%。该研究结果表明，国内C波段小型化加速器整机配套环境和整机性能已经基本上可以满足当前部分能量段的小型化加速器整机系统的研制和使用需求。Abstract: To carry out research on the overall technology of C-band miniaturized accelerators under localization conditions, the Institute of Applied Electronics of the Chinese Academy of Engineering Physics has developed various C-band miniaturized standing wave accelerator tubes. At the same time, a C-band accelerator X-ray source system with mainly domestic components (magnetron, ring resonator, high-voltage power supply, etc.) has been established, and further high-power hot test experiments have been carried out using the accelerator as a testing platform. In the hot test experiment, the main performance indicators of the accelerator were tested according to the testing principles and methods specified in the national standard “GB/T 20129-2015 Electron Linear Accelerator for Non-destructive Testing”. The energy of the accelerator was tested using the steel attenuation method, and the focal size of the accelerator was tested using the “sandwich” method. The final test results indicate that the accelerator focal size is approximately 1.2 mm, and the accelerator’s energy can be continuously adjusted within the range of 3-4 MeV. The dose rate fluctuation of the accelerator within 20 minutes is less than ± 3%. The research results indicate that the supporting environment and overall performance of domestic C-band miniaturized accelerator can basically meet the development and use requirements of miniaturized accelerator systems.
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Key words:
- C-band /
- accelerator /
- X-ray source /
- domestication /
- miniaturization
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图 2 低能档工作时测得的不同厚度钢块下X射线剂量率（点）及其拟合曲线
Figure 2. X-ray dose rate (points) and its fitting curve under different thickness steel block measured at low energy level
图 3 高能档工作时测得的不同厚度钢块下X射线剂量率（点）及其拟合曲线
Figure 3. X-ray dose rate (points) and its fitting curve under different thickness steel block measured at high energy level
图 5 不同位置处测得的胶片图像的像素分析情况
Figure 5. Pixel analysis of film images measured at different positions
表 1 测焦点尺寸的“三明治”法测试结果
Table 1. Test results of “sandwich” method for measuring focus size
position distance from target/mm spot diameter/mm position 1 300 1.5 position 2 500 1.8 position 3 800 2.1 
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