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United States Patent Application

View the Complete Application at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A method for applying an energy dither to a charged particle beam in order to vary the wavelength of the charged particle beam. Bunches of charged particle beams are accelerated by cavities that are operated at a harmonic of the bunch repetition rate. One or more secondary radiofrequency accelerator cavities are added near the wiggler after the primary beam transport to apply a fluctuation between individual bunches with a pseudo-random distribution. The secondary radiofrequency accelerator cavities provide fine variations of the beam energy about a nominal operating point. Operating a free electron laser (FEL) with a 1% change in the electron beam energy via the secondary cavity will result in a 2% wavelength variation of the FEL output.
Powers, Thomas Joseph (Poquoson, VA), Douglas, David R. (Yorktown, VA), Evtushenko, Pavel (Yorktown, VA), Benson, Stephen V. (Yorktown, VA), Neil, George (Williamsburg, VA)
14/ 719,380
May 22, 2015
[0002] The United States Government may have certain rights to this invention under Management and Operating Contract No. DE-ACO5-060R23177 from the Department of Energy.