• N.P. Sobenin, M. Gusarova, V.I. Kaminsky, S.V. Kutsaev, M.V. Lalayan
  MEPhI, Moscow
• L.V. Kravchuk, S.G. Tarasov
  RAS/INR, Moscow

A new computer code for 3D simulation of multipacting phenomenon in axisymmetric and non-axisymmetric rf structures is presented. The goal of the simulation is to determine resonant electron trajectories and electron multiplication in rf structure. Both SW and TW structures of normal- and superconductivity have been studied. Simulation results are compared with theoretical calculations and experimental measurements.

• N.P. Sobenin, S.V. Kutsaev, M.V. Lalayan, V.A. Makarov
  MEPhI, Moscow
• A.A. Krasnov
  ScanTech, Atlanta, Georgia
• V.I. Shvedunov
  MSU, Moscow
• A.A. Zavadtsev
  Introscan, Moscow

Analysis of input coupler asymmetry influence on beam dynamics in superconducting cavities of Energy Recovery Linac (ERL) injector is presented. Both coaxial and waveguide, single and twin input couplers were analyzed. Using computer simulation electromagnetic fields distribution in accelerating cavity was obtained and recalculated to the transverse-kick to the bunch passing the coupler. Also calculation of external coupling was done. RTMTRACE code was adapted for particle beams dynamic simulation. Acceptable transverse emittance growth was achieved for twin-coaxial (4%) and waveguide (5%) input coupler designs.

Slides