Author: Yi, C.H.
Paper Title Page
TUPPC027 Multi Objective Genetic Optimization for Linac Lattice of PAL XFEL 1224
  • C.H. Yi, M.-H. Cho, S.H. Kim, W. Namkung
    POSTECH, Pohang, Kyungbuk, Republic of Korea
  • H.-S. Kang
    PAL, Pohang, Kyungbuk, Republic of Korea
  • K.-J. Kim
    ANL, Argonne, USA
  Funding: Work supported by MEST and POSTECH Physics BK21 Program.
There are a large number of variables and objectives in design of XFEL linac lattices. Recently, most of accelerator physics field, are applying the multi-objective genetic algorithm (MOGA) for these kinds of problems. MOGA was applied to the PAL XFEL linac lattice design. Longitudinal position of all components was fixed before applying MOGA. RF parameters of RF cavities and bending angles of bunch compressors are selected as variables. Various beam parameters computed by ELEGANT were used as objectives. By using MOGA, new linac lattice designs with 2 and 3 bunch compressors was generated and their beam properties are presented in this paper.
TUPPP062 Start to End Simulation of Three Bunch Compressor Lattice for PAL XFEL 1738
  • H.-S. Kang, M.-H. Cho, J.H. Han, T.-H. Kang, I.S. Ko
    PAL, Pohang, Kyungbuk, Republic of Korea
  • C.H. Yi
    POSTECH, Pohang, Kyungbuk, Republic of Korea
  The PAL XFEL is a 0.1-nm hard X-ray FEL project starting from 2011 to finish in 2014, which aims at achieving higher photon flux than 1012 photons/pulse at 0.1 nm using a 10 GeV electron linac. The PAL XFEL is designed to have a hard x-ray undulator line at the end of linac and a branch line at 2.65 GeV point for soft X-ray undulator line. The three bunch compressor lattice (3-BC) is chosen to minimize emitance growth due to CSR and minimize correlated energy spread. The 3-BC lattice makes it possible to operate soft X-ray FEL undulator line simultaneously and independently from hard X-ray FEL undulator line.