Development of a transmittance monitor for high-intensity photon beams

Development of a transmittance monitor for high-intensity photon beams
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高强度光子束透射率监测仪的开发

DOI:
10.1016/j.nima.2018.06.025
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发表时间:
2018
期刊:
Nuclear Instrument and Method A
影响因子:
--
通讯作者:
Y. Matsumura et al.
Y. Matsumura et al.
中科院分区:
--
文献类型:
--
作者:
H. Yamashiro;K. Kawagoe;T. Suehara;T. Yoshioka;K. Fujii and A. Miyamoto;Y. Matsumura et al.

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日本东北大学电子光子科学研究中心研制了第二条标记光子束线的透射率监测器。在这条光束线中,一个内部辐射器被用来产生轫致辐射光子束的循环电子在同步加速器。应确定透射率,其定义为当用光子标记计数器检测到电子时发现光子到达目标位置的概率,以推断光诱导反应的横截面。所开发的监视器包括一个望远镜的薄塑料反射器与正电子和电子转换器,和一个专用的电路实现在一个现场可编程门阵列芯片。透射率可以用该监视器测量对应于20 MHz标记信号的高强度光子束。测量的透射率被发现是恒定的相对于每个光子标记通道的光子强度。
A transmittance monitor has been developed for the second tagged-photon beamline at the Research Center for Electron Photon Science, Tohoku University, Japan. In this beamline, an internal radiator is employed to produce the bremsstrahlung photon beam out of circulating electrons in a synchrotron. The transmittance, which is defined as the probability of finding a photon coming to the target position when an electron is detected with a photon-tagging counter, should be determined to deduce cross sections for photo-induced reactions. The developed monitor consists of a telescope of thin plastic scintillators with a positron and electron converter, and a dedicated circuit implemented in a field-programmable gate array chip. The transmittance can be measured with this monitor for high-intensity photon beams corresponding to 20 MHz tagging signals. The measured transmittance is found to be constant with respect to the photon intensity for each photon-tagging channel.
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DOI: --
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