Author: Goryashko, V.A.
Paper Title Page
TUPPP064 Microbunching Instability Studies in SwissFEL 1744
  • S. Bettoni, B. Beutner
    Paul Scherrer Institut, Villigen, Switzerland
  • V.A. Goryashko
    NASU/IRE, Kharkov, Ukraine
  Shot noise or an initial intensity modulation in the beam pulse may have a strong effect in the FEL linacs and also severely degrade the machine performances in terms of FEL performances. In this paper we present the simulations done to study this effect in SwissFEL, the future free electron laser under design at Paul Scherrer Institute. In particular we calculated the gain of the microbunching instability in the low and high energy part and we performed start-to-end simulations using as initial distribution something as close as possible to the laser profile measured at the SwissFEL injector test facility. We finally present the preliminary calculations to estimate the effect of the laser heater to mitigate this effect.