Spatial distribution of radiation from the Beam Line VIII-W 15-period wiggler

We have written a computer program to calculate the spatial distribution of the radiation from insertion devices operating in nominal wiggler mode (K = 15.6), for which the incoherent emission dominates, and our assumption of negligible coherent emission is valid. This program has been applied to the 15-period wiggler now being designed by the Lawrence Berkeley Laboratory for Beam Line VIII-W on the Stanford Positron-Electron Accumulation Ring (SPEAR). An approximate spreading function has been applied at each photon energy to account for the intrinsic photon divergence. The effects of the finite wiggler length and the spatial and angular spread of the electron beam have been included. Graphical plots are provided for three different electron energies, 1.8 GeV, 3.0 GeV, and 3.4 GeV, and for a range of photon energies. Separate plots are provided for total radiation, parallel polarization component, and perpendicular polarization component. 3 refs., 71 figs., 63 tabs.