Self-Modulation of a Relativistic Electron Beam in a Wiggler

James MacArthur, Joseph Duris, Zhirong Huang, Agostino Marinelli, Zhen Zhang, Schaa, Volker RW (Ed.), Satogata, Todd (Ed.)
2018
Users at x-ray free-electron laser (FEL) facilities have shown strong interest in using single spike, coherent x-ray pulses to probe attosceond dynamics in atoms and molecules. Sub-femtosecond soft x-ray pulses may be obtained from an electron beam that has been modulated in a wiggler resonant with an external laser, the enhanced-SASE technique. We discuss a new way to produce this energy modulation, wherein the external laser is replaced by coherent radiation from the current spike on the tail
more » ... t spike on the tail of the electron beam. We calculate the modulation expected in a wiggler from both a single frequency perspective and a coherent synchrotron radiation (CSR) perspective.
doi:10.18429/jacow-ipac2018-thpmk083 fatcat:2khpr2p4a5az5groekkwv35j3m