IHEP-NDL低增益雪崩探测器（LGAD）的波束测试结果
Beam test results of IHEP-NDL Low Gain Avalanche Detectors(LGAD)
摘要：
为了满足即将到来的高亮度大型强子对撞机（HL-LHC）对时间分辨率的要求，ATLAS正在研究一种基于低增益雪崩探测器（LGAD）的新型探测器--高粒度定时探测器（HGTD）。中国科学院高能物理研究所（IHEP）与北京师范大学新器件实验室（NDL）合作研制了两种IHEP-NDL LGAD（BV 60和BV 170），目前正在进行详细研究。这些探测器在DESY用$5GeV$电子束进行了测试。选择SiPM探测器作为参考探测器，以获得LGAD的时间分辨率。通过高斯函数拟合提取LGAD和SiPM之间的时差波动。采用CFD方法消除了时间游走的影响。分别得到了BV 60和BV 170下的$41 \pm 1 ps$和$63 \pm 1 ps$的时间分辨率。
英文摘要：
To meet the timing resolution requirement of up-coming High Luminosity LHC (HL-LHC), a new detector based on the Low-Gain Avalanche Detector(LGAD), High-Granularity Timing Detector (HGTD), is under intensive research in ATLAS. Two types of IHEP-NDL LGADs(BV60 and BV170) for this update is being developed by Institute of High Energy Physics (IHEP) of Chinese Academic of Sciences (CAS) cooperated with Novel Device Laboratory (NDL) of Beijing Normal University and they are now under detailed study. These detectors are tested with $5GeV$ electron beam at DESY. A SiPM detector is chosen as a reference detector to get the timing resolution of LGADs. The fluctuation of time difference between LGAD and SiPM is extracted by fitting with a Gaussian function. Constant fraction discriminator (CFD) method is used to mitigate the effect of time walk. The timing resolution of $41 \pm 1 ps$ and $63 \pm 1 ps$ are obtained for BV60 and BV170 respectively.
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