主讲人(Lecturer)：Prof. Richard M. Talman, Cornell University,USA 

　　主持人(Chair)：Prof. Chuang Zhang, IHEP 

　　讲座题目(Theme)：The Luminosity of Circular e+e- Higgs Factories 

　　内容摘要 (Abstract)： 

　　The luminosity of circular e+e- Higgs Factories is discussed. It is shown that a single ring is superior to two rings. Beam separation is possible over the energy range from Z0 through Higgs to WW threshold. For various reasons it will be difficult to reduce the vertical beta function at the crossing point below 1 cm. Naively, this would cause a reduction in luminosity by a factor of 10 compared to the 1 mm value that some people have (optimistically but erroneously) adopted. But it is shown that the reduction in luminosity will only be about a factor of three, not ten (because the beam-beam tune-shift parameter can be increased). 

　　演讲人简介 (Lecturer’s short bio): 

　　I grew up in London, Canada, attended Ryerson (the same public school as Dave Jackson and Roger Penrose) and received B.A. and M.A. (mathematics) at University of Western Ontario.  I received PhD in Physics at Caltech in 1962 and have been at Cornell University ever since.  Initially I did experimental particle physics, for example building dE/dx detector of CLEO at CESR. Since then I have mainly been involved in accelerator physics, (sadly) including being group leader of instrumentation Group at the SSC. 

　　（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5月13日（星期二）下午14：00 (May 13, 14:00) 

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