Background noise in Compton radiography diagnostic
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摘要: 康普顿照相是用于压缩靶丸成像、诊断内爆压缩对称性的一种有效技术手段。如何屏蔽成像过程中的背景噪声是康普顿照相技术的重点问题，同时也是一个难点问题。分析了靶环境以及各种背景信号的来源，并提出了相应的屏蔽建议。通过分析可以看到，在中子产额小于1013 sr-1、压缩靶丸中心温度小于5 keV时，通过使用相应的屏蔽措施并采用合适的诊断措施和记录设备，可以把背景噪声降至109 sr-1以下，使康普顿照相中的面密度测量精度达到5%左右。Abstract: As an important diagnostic, Compton Radiography provides a means to measure the areal density and asymmetries of the DT fuel in an ICF capsule near the time of peak compression. How to mitigate background noise is very important but difficult. This paper analyzes each source of background noise in detail, and point out how to reduce the background noise, respectively. By optimizing the configuration of the detector and minimizing noise onto the detector, it will achieve 20 signal to noise ratio for neutron yields up to 1013 sr-1 and electron temperature of capsule core up to 5 keV, allowing fuel areal density to be measured with an accuracy of 5%.
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Key words:
- Compton Radiography /
- background noise /
- hard X-ray /
- implosion /
- fuel areal density
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