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Soft X-ray cryogenic radiometer
- NUCLEAR TECHNIQUES Vol. 41, Issue 4, Article number: 040101(2018)
- 作者机构：
1.中国科学院高能物理研究所 北京 100049
2.中国科学院大学 北京 100049
3.中国科学院光电研究院 北京 100094
- 作者简介：
- 基金信息：National Science Instruments Major Project of China;National Natural Science Foundation of China;National Natural Science Foundation of China
DOI：10.11889/j.0253-3219.2018.hjs.41.040101
CLC： O434.12Received：28 November 2017，
Revised：11 January 2018，
Published：10 April 2018
- 稿件说明：
移动端阅览
Xiaoliang ZHAO, Yidong ZHAO, Kun TANG, et al. Soft X-ray cryogenic radiometer[J]. Nuclear techniques, 2018, 41(4): 040101
Xiaoliang ZHAO, Yidong ZHAO, Kun TANG, et al. Soft X-ray cryogenic radiometer[J]. Nuclear techniques, 2018, 41(4): 040101 DOI： 10.11889/j.0253-3219.2018.hjs.41.040101.
摘要
介绍了在北京同步辐射（Beijing Synchrotron Radiation Facility，BSRF）标定源的4B7B实验站上建立的一套软X光低温辐射计系统，用于测量从30nW~1μW范围的软X光功率。经多次实验发现：热沉和吸收体的温度稳定性以及热辐射背底涨落的控制是降低X光功率测量不确定度的关键。热沉的温度稳定是吸收体温度稳定的前提；吸收体上电加热功率根据待测X光功率调节，通过温度控制系统实现；低功率下X光功率测量不确定度受热辐射背底涨落的影响较大，通过优化热沉和吸收体的温度控制系统以及改进热链接的设计及工艺，使热沉的温度标准差控制在10 μK以下，吸收体的在15 μK以下。通过改善吸收体和热沉的受热环境，以及对通光管做特殊设计，控制热辐射背底的涨落在0.06 nW以内。对30 nW光功率的测试结果显示测量不确定度小于1%（
k
=1）。
Abstract
Background
2
There is no commercial soft X-ray cryogenic radiometer available for 4B7B experiment station on Beijing synchrotron radiation facility (BSRF).
Purpose
2
This study aims to design and implement a soft X-ray cryogenic radiometer to measure the X-ray power from 30nW to 1 μW for BSRF.
Method
2
Intensive experiments were performed to find the key points to reduce the uncertainties of X-ray power measurement. The temperature stabilities of the heat sink
the absorber and the control of thermal radiation background fluctuation are principal factors influencing the accuracy whilst the temperature stability of the heat sink is the precondition of the absorber temperature stability. The heating power on the absorber is determined by the X-ray power and adjusted by the temperature control system. And for low X-ray power measurement
the uncertainties can be affected by the fluctuation of thermal radiation background.
Result & Conclusion
2
Through optimizing the temperature control system of the heat sink and the absorber
and improving the design technics of the heat link
the standard deviation of the heat sink can be kept under 10 μK
and the absorber is kept under 15 μK. The fluctuation of thermal radiation background can be stabilized less than 0.06 nW by improving the thermal environment and design special light pipes. The result of 30 nW X-ray power measurement shows that total uncertainties are less than 1% (
k
=1).
关键词
Keywords
references
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