Author: Ha, G.
Paper Title Page
MOPS035 Energy Spreads by Transient Beam Loading Effect in Pulsed RF Linac 679
  • S.H. Kim, M.-H. Cho, G. Ha, H.R. Yang
    POSTECH, Pohang, Kyungbuk, Republic of Korea
  • W. Namkung, S.J. Park
    PAL, Pohang, Kyungbuk, Republic of Korea
  • J.-S. Oh
    NFRI, Daejon, Republic of Korea
  Funding: Work partly supported by KAPRA and POSTECH Physics BK21 Program
RF linacs for high power beams are operated in the fully beam-loaded condition for the power efficiency. In this condition, temporal energy spreads are induced by the transient beam loading effect. Irradiation sources require the beam energy of less than 10 MeV to prevent undesirable neutron production. In order to maximize the beam power and maintain the beam energy in a safe value, we need to suppress the temporal energy spreads. In an L-band traveling-wave linac for irradiation sources, the high energy electrons are suppressed by the beam current modulation with the RF power modulation. As a result, the average beam energy and the corresponding beam power are improved by nearly 60% compared to the case without any modulations.