主讲人 (Lecturer)：Dr. Yuhong Zhang, Jefferson Lab (JLAB), USA 

　　主持人 (Chair)：Prof. Jie Gao, IHEP 

　　讲座题目 (Theme)：An Overview of Electron-Ion Collider Proposals Worldwide 

　　内容摘要 (Abstract)： 

　　An electron-ion collider (EIC) is likely to be one of the future large accelerator facilities for high energy and nuclear physics. It has long been considered a perfect gluon microscope to explore the fundamental structure of matter. At very high energies, EIC can also be utilized as a Higgs factory. Presently, there are five EIC proposals under active development worldwide. They are LHeC at CERN and ENC at GSI in Europe; eRHIC at BNL and MEIC at JLab in the USA; and HIAF at IMP in China. Four proposals will utilize either an existing or under construction facility for delivering one of two colliding beams while the Chinese proposal is a green field design. Each of these proposed facilities covers a distinct energy range and adopts either ring-ring or linac (ERL)-ring collider scenarios. In order to deliver high performance to satisfy the science needs, an array of advanced accelerator concepts and technologies has been integrated into to the machine designs. However, these facility proposals share many common accelerator R&D elements, such as energy recovery linacs, beam cooling, polarized particle sources and polarized beams. In this seminar, I will present an overview of these EIC proposals. The talk will focus on design concepts, features, present status as well as technical innovations and accelerator R&D challenges. Finally, it is interesting to know that two new EIC proposals, both in extreme high energy range and based on future circulator colliders (FCC and CEPC-SppC), are emerging. They will be mentioned very briefly. 

　　演讲人简介 (Lecturer’s short bio): 

　　Yuhong Zhang graduated from Fudan University in 1983 with a BS degree in physics. He received a Ph.D. degree in Physics from University of Maryland at College Park in 1990. His thesis is in the area of general relativity theory and cosmology. Yuhong Zhang joined Jefferson Lab in 2001. He has conducted research in the areas of space charge/photo-injector, electron-ion collider, beam-beam and electron cooling.  He is currently a Senior Staff Scientist at JLAB, and the leader of the electron-ion collider design team at JLAB since 2008. Before joining JLAB, he also conducted research in chemical physics and biophysics.  

　　（参加此系列讲座可计入职工继续教育2小时）(Permanent Education Program) 

　　时间 (Time)：2014年4月29日（星期二）下午14：00 (April 29, 14:00) 

　　地点 (Place)：5#厅二楼会议室（Hall No.5, Meeting Room）