Construction and performance of 128-channel segmented pulsed μSR and μe detection system at Dai Omega
Construction and performance of 128-channel segmented pulsed μSR and μe detection system at Dai Omega
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DOI：
10.1016/j.nima.2005.08.051
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发表时间：
2005-12
影响因子：
1.4
通讯作者：
Hiroyuki Tanaka;K. Nagamine;H. Miyadera;K. Shimomura;Y. Ikedo;K. Nishiyama;K. Ishida
中科院分区：
文献类型：
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作者：
Hiroyuki Tanaka;K. Nagamine;H. Miyadera;K. Shimomura;Y. Ikedo;K. Nishiyama;K. Ishida
为了利用韩国科学院大立体角轴向聚焦超导表面μ子通道Dai Omega现有的4 MeV瞬时强脉冲μ子束进行μSR和μe测量，对传统数字技术中的探测器分段进行了改进，使其能够接受2.0× 104 μ子/溢出的预测事件率。设计了一个新的探测系统，用128个双符合探测器收集强μe衰变正电子。新的检测系统的一个主要特点是采用多阳极光电管（MAPMT），使检测系统紧凑。我们采用一种特殊的光纤保持器来缓解通道间的串扰问题。通过μSR和μe测试实验验证了该检测系统的性能。
In order to perform μSR and μe measurements with an instantaneously intense pulsed 4-MeV muon beam currently available at Dai Omega, which is a large solid-angle-axial focusing superconducting surface muon channel at KEK-MSL, the detector segmentation in the conventional digital technique was improved to accept the predicted event rate of 2.0×104muons/spill. A new detection system was designed to collect intense μe decay positrons with 128 two-fold coincidence detector elements. A major feature of the new detection system was an employment of multi-anode phototubes (MAPMT) to make the detection system be compact. We mitigated the problems related cross talks among channels by employing a special fiber holder. The performance of the detection system was confirmed by μSR and μe test experiments.