LLRF Controls Upgrade for the LCLS XTCAV project at SLAC

Shantha Condamoor, Yuantao Ding, Patrick Krejcik, Henrik Loos, Timothy Maxwell, Jeff Olsen, Schaa, Volker RW (Ed.), Corvetti, Lou (Ed.), Riches, Kathleen (Ed.)
SLAC's Low Level Radio Frequency (LLRF) controls software for the S-Band deflecting structures needed to be upgraded significantly when a new X-Band transverse deflecting cavity (XTCAV) was installed downstream of the LCLS undulators in Spring 2013 to assist in FEL diagnostics such as characterizing the temporal profile of X-ray pulses that vary shot-to-shot. The unique location of the XTCAV in the beamline posed several challenges. A new design of the Modulator and Klystron control Support
more » ... control Support Unit (MKSU-II) for interlocking was added at the XTCAV controls station that required new software development. The timing setup was also different from the rest of the Linac. This paper outlines the LLRF controls layout for the XTCAV and discusses the manner in which the challenges were addressed. XTCAV has now become a successful tool for gathering data that enables reconstruction of X-ray FEL power profiles with greater resolution.
doi:10.18429/jacow-icalepcs2015-mopgf014 fatcat:hsobl2vmtbfx5oymmv5apofvp4