SEMINAR      Thursday, 13 July 2004 - h. 15:00  Auditorium B. Touschek   John Byrd (Lawrence Berkeley National Laboratory) Coherent synchrotron radiation in a storage ring Abstract Coherent synchrotron radiation (CSR) was anticipated in storage rings  almost a century ago. However, it is only recently that we have been able to observe and study it.    I will present a summary of our present understanding of CSR in rings and how we may be able to use as a powerful source of radiation in the terahertz wavelength region.    The present understanding includes distortion of bunch shape from the CSR, enhancing higher frequency coherent emission and limits to stable emission due to a microbunching instability excited by the CSR.    This model is supported by observations of CSR at several facilities such the BESSY-II  and ALS storage rings.    I will show recent results of CSR emission from 150 femtosecond modulations in the bunch generated by laser slicing of the electron beam.