Studies on Bremsstrahlung sources in the BTH and LCLS undulator Irradiation of the FEE by Bremsstrahlung beams from these sources

The bremsstrahlung power generated in the BTH and undulator and reaching the FEE has been simulated with the FLUKA [1] intra-nuclear cascade code. Calculations contain a detailed description of all 33 segments, quadrupoles, collimators, dump systems and surrounding walls and halls. Three bremsstrahlung sources are surveyed. The first one describes the photons arising from the interception of the beam by a wire scanner. The second analyzes the interaction of the beam halo with the C{x/y}31-38 collimators. In the third case a tune up beam dump is placed in the beam path. A separate paper [2] will cover the prompt dose rate implications of each of these scenarios. Results for the first case are greater than previous assumptions (800 mW) for carbon wires and render the use of tungsten wires inadvisable. The photon powers originated in the second and third cases are much lower. Studies on Bremsstrahlung sources in the LCLS undulator Irradiation of the FEE by Bremsstrahlung beams from the undulator M. Santana, A. Fassò