Coherent Radiation in Insertion Devices-II
  We represent results of calculations of coherent synchrotron radiation (CSR) of the relativistic bunch in an undulator with a vacuum chamber of arbitrary cross section with a new algorithm. This algorithm associated with direct calculations of electric field rather than the vector potential. CSR normalized to the incoherent one and compared with analytical calculations for a free space. 
E.G.Bessonov, A.A.Mikhailichenko
physics.acc-ph