• 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

• S.V. Kutsaev, A. Anisimov, N.P. Sobenin
  MEPhI, Moscow
• M.A. Ferderer, A.A. Krasnov, A.A. Zavadtsev
  ScanTech, Atlanta, Georgia

The results of analysis and comparison of different linear accelerator designs for 10 MeV facility powered by 4.5 MW klystron on 5712 MHz operation frequencies presented. Several concepts of accelerator including standing wave and traveling wave ones with either rf or magnetic focusing were considered. Cells geometry and beam dynamics parameters in these types of accelerators featuring high capture factor were obtained using numeric simulation methods. The computer simulation code for traveling wave linac optimization based on beam dynamics with space charge consideration was developed. Accelerating structures and input coupler for traveling wave linac along with standing wave one were designed. The task of energy variation was solved.