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TY - CONF AU - Krejcik, P. AU - Bowden, G.B. AU - Condamoor, S. AU - Ding, Y. AU - Dolgashev, V.A. AU - Eichner, J.P. AU - Franzi, M.A. AU - Haase, A.A. AU - Lewandowski, J.R. AU - Maxwell, T.J. AU - Tantawi, S.G. AU - Wang, J.W. AU - Xiao, L. AU - Xu, C. ED - Schaa, Volker RW TI - Sub-fs Resolution with the Enhanced Operation of the X-band Transverse Deflecting Cavity using an RF pulse Compression SLED Cavity J2 - Proc. of IBIC2016, Barcelona, Spain, Sept. 13-18, 2016 C1 - Barcelona, Spain T2 - International Beam Instrumentation Conference T3 - 5 LA - english AB - The successful operation of the x-band transverse deflecting cavity (XTCAV) installed downstream of the LCLS undulator has been further enhanced by the recent addition of an RF pulse compression "SLED" cavity that doubles the temporal resolving power of this powerful diagnostic system for measurement of the longitudinal profile of both the electron bunch and the x-ray FEL pulse. RF pulse compression has allowed us to use the existing SLAC X-band klystron with nominal output power of 50 MW and extend the RF pulse length by a factor 4 to give us 4 times the peak power after compression. A new, innovative SLED cavity was designed and built at SLAC to operate efficiently at X-band*. The elegant design uses a small spherical cavity combined with a polarizing mode coupler hybrid. We will report on the installation, commissioning and beam measurements demonstrating the sub-femtosecond resolution of the XTCAV system. PB - JACoW CP - Geneva, Switzerland SP - 834 EP - 836 KW - cavity KW - klystron KW - electron KW - operation KW - photon DA - 2017/02 PY - 2017 SN - 978-3-95450-177-9 DO - 10.18429/JACoW-IBIC2016-WEPG77 UR - http://jacow.org/ibic2016/papers/wepg77.pdf ER -