• C.D. Nantista, C. Adolphsen, K.L.F. Bane, Z. Huang, Z. Li, F. Wang, F. Zhou
  SLAC, Menlo Park, California

With the growing demand for FEL light sources, cost issues are being revaluated. To make the machines more compact, higher-frequency room-temperature linacs are being considered, in particular, ones using C-band (5.7 GHz) rf technology where 40 MV/m gradients are possible. In this paper, we show that an X-band (11.4 GHz) linac using the technology developed for NLC/GLC can provide an even lower cost solution. In particular, stable operation is possible at gradients of 100 MV/m for single bunch operation, and 70 MV/m for multibunch operation. The concern of course is whether the stronger wakefields will lead to unacceptable emittance dilution. However, we show that the small emittances produced in a 250 MeV, low bunch charge, LCLS-like S-band injector and bunch compressor can be preserved in a multi-GeV X-band linac with reasonable alignment tolerances.

• J.C. Frisch, R. Akre, J. Arthur, C. Bostedt, J.D. Bozek, A. Brachmann, P.H. Bucksbaum, R.N. Coffee, F.-J. Decker, Y.T. Ding, D. Dowell, S.A. Edstrom, P. Emma, A.S. Fisher, J.N. Galayda, A. Gilevich, J.B. Hastings, G.R. Hays, P. Hering, Z. Huang, R.H. Iverson, H. Loos, M. Messerschmidt, A. Miahnahri, S.P. Moeller, H.-D. Nuhn, D.F. Ratner, J.A. Rzepiela, D.C. Schultz, T.J. Smith, H. Tompkins, J.L. Turner, J.J. Welch, J. Wu, G. Yocky
  SLAC, Menlo Park, California
• R.M. Bionta
  LLNL, Livermore, California
• G. Pile
  ANL, Argonne

The LCLS FEL began user operations in September 2009, with photon energies from 800eV to 2 KeV and pulse energies above 2 mJ. Both long pulse (50-200 femtosecond FWHM) and short pulse (<10 femtosecond FWHM at 150 uJ) pulses were delivered at user request. In addition the FEL was operated at fundamental photon energies up to 10 KeV in preparation for hard X-ray experiments. FEL operating parameters, performance and reliability results will be presented, in addition to plans for upgrades to the facility.

Slides