• J.C. Frisch, C. Bostedt, J.D. Bozek, A. Brachmann, R.N. Coffee, F.-J. Decker, Y.T. Ding, D. Dowell, P. Emma, A. Gilevich, G. Haller, G.R. Hays, P. Hering, B.L. Hill, Z. Huang, R.H. Iverson, E.P. Kanter, B. Kraessig, H. Loos, A. Miahnahri, H.-D. Nuhn, A. Perazzo, M. Petree, D.F. Ratner, T.J. Smith, S.H. Southworth, J.L. Turner, J.J. Welch, W.E. White, J. Wu, L. Young
  SLAC, Menlo Park, California
• R.B. Wilcox
  LBNL, Berkeley, California

In ad­di­tion to its nor­mal op­er­a­tion at 250pC, the LCLS has op­er­at­ed with 20pC bunch­es de­liv­er­ing X-ray beams to users with en­er­gies be­tween 800eV and 2 keV and with bunch lengths below 10 fs FWHM. A bunch ar­rival time mon­i­tor and tim­ing trans­mis­sion sys­tem pro­vide users with sub 100 fs syn­chro­niza­tion be­tween a laser and the X-rays for pump / probe ex­per­i­ments. We de­scribe the per­for­mance and op­er­a­tional ex­pe­ri­ence of the LCLS for short bunch ex­per­i­ments.