Author: Kaiser, M.G.
Paper Title Page
MOAL4 First Results from the Bunch Arrival-Time Monitor at the SwissFEL Test Injector 8
  • V.R. Arsov, M.M. Dehler, S. Hunziker, M.G. Kaiser, V. Schlott
    PSI, Villigen PSI, Switzerland
  Non-destructive electron bunch arrival-time monitors (BAMs) with resolution <10 fs, sensitivity down to 10 pC and high intrinsic bandwidth for double bunch detection are required for reliable operation of SwissFEL. To achieve this ultimate goal, such a monitor based on a Mach-Zehnder electro-optical intensity modulator has been under development at the SwissFEL Test Injector. The high timing precision is derived by a stable pulsed optical reference system. The first BAM is located before the bunch compressor where the bunch energy is 230 MeV and the pulse length is approximately 3 ps. At this position, the bunch arrival time is sensitive to the laser- and gun timing. In this paper, we report on the commissioning of the RF- and optical front ends, the first arrival-time jitter and drift measurements with the entire system, as well as correlation of the arrival-time with different machine and environmental parameters. We achieve a resolution of 20 fs down to 60 pC.  
slides icon Slides MOAL4 [1.228 MB]