Commissioning of the LCLS-II Machine Protection System for MHz CW Beams
154
J.A. Mock, A.S. Fisher, R.T. Herbst, P. Krejcik, L. Sapozhnikov
SLAC, Menlo Park, California, USA
Beam power at the LCLS-II linac and FEL can be as high as several hundered kW with CW beam rates up to 1 MHz. The new MPS has a latency of less than 100 µs to prevent damage when a fault or beam loss is detected. The MPS architecture encompasses the multiple FEL beamlines served by the SC linac and can mitigate a fault in one beamline without impacting the beam rate in a neighboring beamline. The MPS receives inputs from various devices including loss monitors and charge monitors as well as magnet power supplies and BPMs to pre-emptively turn of the beam if a fault condition is detected. Link nodes distributed around the facility gather the input data and stream it back to a central processor that signals other link nodes connected to beam rate control devices. Commmissioning and experience with the new system will be described.
Proposal for a Low-Cost Wakefield Deflector for CW X-ray FEL Operation
D.K. Bohler, P. Krejcik, A.A. Lutman, A. Novokhatski
SLAC, Menlo Park, California, USA
SLAC National Accelerator Laboratory is undertaking a project to develop a dielectric wakefield deflector with the goal of enhancing Free-Electron Laser (FEL) operational modes and providing comprehensive bunch diagnostics. The project aims to re-establish and optimize the Fresh-slice operation modes in the recently upgraded Soft X-ray Line (SXR) of the LCLS, a scheme noted for its success in delivering femtosecond, high-power double-pulses within the SXR wavelength range and contributing significantly to research published in high-impact journals. The novel wakefield deflector design incorporates an L-shaped bar and a dielectric wakefield deflector using an anodized aluminum bar, drawing from the successful approaches of teams at DESY and PSI. This single straight, rectangular aluminum L-shaped bar, coated with an aluminum oxide dielectric layer, represents a marked improvement over previous corrugated metal jaw designs. Furthermore, this project explores the potential of this passive streaker as a diagnostic tool for electron bunch phase space, promising exciting advancements in the field of accelerator technologies
LCLS-II Timing System and Synchronous Bunch Data Acquisition
453
C. Bianchini Mattison, K.H. Kim, P. Krejcik, M. Weaver, S. Zelazny
SLAC, Menlo Park, California, USA
The new timing system for the LCLS-II SC linac and FEL meets the challenging requirements for delivering multiple interleaved timing patterns to a number of different destinations at rates up to 1 MHz. The timing patterns also carry information on bunch charge and beam energy to prevent inadvertent selection of beam dumps beyond their rated beam power. Beamline instruments are equipped with a timing receiver that performs bunch-by-bunch synchronous data acquisition based on the timing pattern for that location. Data is buffered in on-board memory for up to 106 machine pulses (1 second at 1 MHz). The large data volume can be locally processed and and analysed before transmission to clients on the network. Commissioning and experience with the new system will be presented.
Right click on video for Picture-in-Picture mode or Full screen display.