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Method of controlling coherent synchroton radiation-driven degradation of beam quality during bunch length compression

United States Patent

July 10, 2012
View the Complete Patent at the US Patent & Trademark Office
Thomas Jefferson National Accelerator Facility - Visit the Technology Review Committee Website
A method of avoiding CSR induced beam quality defects in free electron laser operation by a) controlling the rate of compression and b) using a novel means of integrating the compression with the remainder of the transport system: both are accomplished by means of dispersion modulation. A large dispersion is created in the penultimate dipole magnet of the compression region leading to rapid compression; this large dispersion is demagnified and dispersion suppression performed in a final small dipole. As a result, the bunch is short for only a small angular extent of the transport, and the resulting CSR excitation is small.
Douglas; David R. (Newport News, VA), Tennant; Christopher D. (Williamsburg, VA)
Jefferson Science Associates, LLC (Newport News, VA)
12/ 381,954
March 18, 2009
The United States of America may have certain rights to this invention under Management and Operating Contract DE-ACO5-060R23177 from the United States Department of Energy.