分类： 物理学 >> 核物理学 提交时间： 2025-05-23
Guo, Dr. Yuhang
Li, Dr. Qiang
bao, Dr. yu
Pan, Mr. Ziwen
Lv, Dr. You
Stewart, Dr. Rhea
Hillier, Prof. Adrian
Cottrell, Prof. Stephen
Baker, Prof. Peter
Lord, Prof. James
liu, Mr. lei
Liang, Prof. Zhijun
Li, Dr. Mengzhao
Zhao, Prof. Mei
Gaobo, Dr. Xu
Feng, Dr. Meichan
摘要： Muon Spin Rotation/Relaxation/Resonance (μSR) is a versatile and powerful non-destructive technology for investigating the magnetic properties of materials at the microscopic level. The μSR technique typically utilizes fully spin polarized beams of positive muons generated at particle accelerator facilities and measures the evolution of the muon spin polarization inside a sample to extract information about the local magnetic environment in materials. With the development of accelerator technologies, intensities of muon beams are being continuously improved, which will cause a pile-up problem to the μSR spectrometer. This problem is becoming especially challenging at intense pulsed muon sources since the instantaneous data rates are expected to be much higher. The first muon source in China, named MELODY, is currently under construction and will be a pulsed source of muons operated at a repetition frequency of only 1 Hz due to limitations of the accelerator system at CSNS. Consequently, there is a strong motivation to operate MELODY at significantly higher muon intensities. This necessitates an upgrade of the detector system inside the spectrometer, which should be smaller and faster to accommodate the increased intensity per pulse of muons. The Low Gain Avalanche Diode (LGAD), characterized by a typical pulse width of 2 ns and a segmentation size in the centimeters range, has the potential to significantly improve the counting rates of μSR spectrometers that utilize a high intensity pulsed muon source. Thus, it is expected that the LGAD detector is a promising candidate to enhance the performance of μSR spectrometers at the new MELODY muon source. To validate this, tests on the LGAD were conducted at the ISIS pulsed muon source at the Rutherford Appleton Laboratory, UK. This paper will describe the setup of the candidate LGAD devices and the subsequent analysis of the experiment data.
分类： 物理学 >> 核物理学 提交时间： 2025-01-22
Qi, Dr. Huirong 祁辉荣
Chang, Miss Yue
She, Mr. Xin
Zhang, Miss Jinxian
Dai, Dr. Hongliang
Yu, Chunxun
Wu, Prof. Linghui
Zhao, Dr. Guang
Wang, Jianchun
Deng, Dr. Zhi
Wang, Prof. Yifang
Chen, Prof. Yuanbo
Zhang, Miss Jian
摘要： Time Projection Chambers (TPCs) are extensively used in collider experiments due to their superior physical performance. Particularly for future positron-electron colliders in Higgs physics studies, the next-generation TPC technology must provide better momentum resolution and improved spatial resolution. The avalanche fluctuation factor, a crucial parameter affecting spatial resolution, is challenging to measure accurately, whether directly or indirectly. This research leveraged the exceptional stability and ionization properties of ultraviolet lasers to achieve a precise determination of the avalanche fluctuation factor. The test outcomes were found to agree with the calculated values at the same gain levels, thereby validating the reliability of the experimental findings.
分类： 物理学 >> 核物理学 提交时间： 2024-12-02
Qi, Dr. Huirong 祁辉荣
Chang, Miss Yue
She, Mr. Xin
Zhang, Miss Jinxian
Dai, Dr. Hongliang
Yu, Chunxun
Wu, Prof. Linghui
Zhao, Dr. Guang
Wang, Jianchun
Deng, Dr. Zhi
Wang, Prof. Yifang
Chen, Prof. Yuanbo
Zhang, Miss Jian
摘要： Time Projection Chambers (TPCs) are extensively used in collider experiments due to their superior physical performance. Particularly for future positron-electron colliders in Higgs physics studies, the next-generation TPC technology must provide better momentum resolution and improved spatial resolution. The avalanche fluctuation factor, a crucial parameter affecting spatial resolution, is challenging to measure accurately, whether directly or indirectly. This research leveraged the exceptional stability and ionization properties of ultraviolet lasers to achieve a precise determination of the avalanche fluctuation factor. The test outcomes were found to agree with the calculated values at the same gain levels, thereby validating the reliability of the experimental findings.
分类： 核科学技术 >> 粒子加速器 提交时间： 2023-06-18 合作期刊: 《Nuclear Science and Techniques》
WU Fang-Fang
ZHOU Ze-Ran
YANG Yong-Liang
SUN Bao-Gen
ZOU Jun-Yin
LU Ping
CHENG Chao-Cai
LUO Qing
XU Jun
摘要： The four electrodes in the stripline beam position monitor (BPM) for Hefei Light Source (HLS II) storage ring are of axially symmetric type. We have derived a new calibration method of electrode gains for this type stripline BPM. The gain fit error of different data grids was analyzed, and the � 5 mm by � 5 mm grid is the best. The electrode gains of two stripline BPMs (HLS II SR-BD-STLB1 and HLS II SR-BD-STLB2) were obtained based on offline calibrated data. The results show that data after fitting gains are improved, with the electrode gains being between 0.94 and 1.15.
分类： 物理学 >> 核物理学 提交时间： 2016-09-13
LEI Xiang-Cui
HENG Yue-Kun
QIAN Sen
XIA Jing-Kai
LIU Shu-Lin
WU Zhi
YAN Bao-Jun
XU Mei-Hang
WANG Zheng LI Xiao-Nan
RUAN Xiang-Dong
Wang Xiao-Zhuang
YANG Yu-Zhen
WANG Wen-Wen
FANG Can
LUO Feng-Jiao
LIANG Jing-Jing 1,4 YANG Lu-Ping 1,7 YANG Biao 1,2
摘要： The neutrino detector of the Jiangmen Underground Neutrino Observatory (JUNO) is designed to use 20 kilotons of liquid scintillator and approximately 16,000 20-inch photomultipliers (PMTs).One of the options is to use the 20-inch R12860 PMT with high quantum efficiency which has recently been developed by Hamamatsu Photonics. The performance of the newly developed PMT preproduction samples is evaluated. The results show that its quantum efficiency is�0%燼t�00nm. Its Peak/Valley (P/V) ratio for the single photoelectron is 4.75 and the dark count rate is�7kHz燼t the threshold of 3 mV while the gain is at��07. The transit time spread of a single photoelectron is2.86ns. Generally the performances of this new 20-inch PMT are improved over the old one of R3600.
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