Title :
Simulation studies of a XUV/soft X-ray harmonic-cascade FEL for the proposed LBNL recirculating linac
Author :
Fawley, W.M. ; Barletta, W.A. ; Corlett, J.N. ; Zholents, A.
Author_Institution :
Lawrence Berkeley Lab., Berkeley, CA, USA
Abstract :
Presently there is significant interest at LBNL in designing and building a facility for ultrafast (i.e. femtosecond time scale) X-ray science based upon a superconducting, recirculating RF linac. In addition to producing synchrotron radiation pulses in the 1-15 keV energy range, we are also considering adding one or more free-electron laser (FEL) beamlines using a harmonic cascade approach to produce coherent XUV & soft X-ray emission beginning with a strong input seed at ∼200 nm wavelength obtained from a "conventional" laser. Each cascade is composed of a radiator together with a modulator section, separated by a magnetic chicane. The chicane temporally delays the electron beam pulse in order that a "virgin" pulse region (with undegraded energy spread) be brought into synchronism with the radiation pulse, which together then undergo FEL action in the modulator. We present various results obtained with the GINGER simulation code examining final output sensitivity to initial electron beam parameters. We also discuss the effects of external laser noise and shot noise upon this particular cascade approach which can limit the final output coherence.
Keywords :
accelerator RF systems; electron beams; free electron lasers; laser noise; linear accelerators; shot noise; 1 to 15 keV; FEL; GINGER simulation code; LBNL recirculating linac; XUV; electron beam parameters; electron beam pulse; external laser noise; free-electron laser beamlines; harmonic cascade approach; magnetic chicane; recirculating RF linac; shot noise; soft X-ray emission; soft X-ray harmonic-cascade; synchrotron radiation pulses; Buildings; Electron beams; Free electron lasers; Linear particle accelerator; Pulse modulation; Quantum cascade lasers; Radio frequency; Superconducting device noise; Synchrotron radiation; X-ray lasers;
Conference_Titel :
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the
Print_ISBN :
0-7803-7738-9
DOI :
10.1109/PAC.2003.1289541