【7.21; Seminar】2025年粒子天体物理全国重点实验室系列学术报告 #18 & 19：Introduction to the Semiconductor Tracker in High Energy Physics & Ultra-Fast Silicon Detector: Low Gain Avalanche Diode and 3D Detector

时间/Time: 7月21日周五上午10:00 & 下午3:00/Monday, July 21, 10:00 a.m. & 15:00

地点/Location: 多学科楼312会议室/Meeting Room 312, Multidisciplinary building

报告人/Speaker: 张登峰 (University of  Sheffield)

主持人/Host: 刘佳研究员/ Dr. LIU Jia

#腾讯会议：899-712-065

题目1/Title1: Introduction to the Semiconductor Tracker in High Energy Physics

摘要1/Abstract1:

The semiconductor detector was proposed to be used in particle detection in 1950s. In the past decades, it has been developing rapidly, various semiconductor detector technologies have been developed and applied in high energy physics, nuclear physics, medical imaging, etc. The semiconductor detector has the advantages of fast response, high energy resolution, high spatial resolution, radiation hardness, and so on, making it a  preferred technology for particle tracking in HEP experiments. It was used as the tracker for the first time on HEP detector in 1981, since then it has been adopted as the charged particle tracker on almost every HEP detector.

In this report, I will give a brief introduction to the semiconductor detector, including its history, working principle, design and fabrication, etc. Various semiconductor detector technologies and their applications on the HEP detector will also be presented. In addition, I will also present some of its application in other fields, like medical imaging, spectroscopic imaging, etc.

题目2/Title2: Ultra-Fast Silicon Detector: Low Gain Avalanche Diode and 3D Detector

摘要2/Abstract2:

Currently, there are two main detector technologies of Ultra-Fast Silicon Detector(UFSD): Silicon Low Gain Avalanche Diode (LGAD) and 3D Detector.  In LGAD, a gain layer is implemented beneath the surface electrode of the thin sensor to achieve an ultra-fast signal. 3D Detector features columnar electrodes etched perpendicularly to the wafer surface, this structure decouples the sensor thickness and the distance charge carriers must travel to the electrodes, enabling the rapid signal collection and enhanced radiation tolerance, etc. Both detector technologies have attracted extensive investigations, a time resolution of below 30 ps have been achieved on both thin LGAD and small pitch 3D Detector.

This report will cover the design and working principle of the LGAD and 3D Detector. The preliminary measurement results of the LGAD fabricated by Teledyne e2v and the 3D-Trench Pixel Detector fabricated by IMECAS will also be presented.

个人简介/Biography:

Dr. Dengfeng Zhang is a postdoctoral research fellow at the University of Sheffield. Dr. Zhang obtained his PhD in particle physics and nuclear physics from Shandong University in 2018. Prior that, he studied at Shandong University at Weihai from 2009 to 2013 and obtained his B.S. and B.E. in 2013. After his PhD graduation in 2018, he joined Tsinghua University as a postdoctoral research assistant. In 2021 he joined the University of Sheffield.