Shielding Design for a 500 kW Electron Accelerator at TRIUMF

                                 Anne Trudel
                                   TRIUMF

Abstract:
TRIUMF is constructing a 50 MeV, 10 mA superconducting electron linear
accelerator as part of its future Advanced Rare IsotopE Laboratory (ARIEL).  The
old Proton Hall adjacent to the 500 MeV cyclotron vault is being repurposed to
house the e-Linac.  FLUKA was used to assess the shielding design for the new
Electron Hall that will house the e-Linac.  In addition, the shielding design
needed to include a possible future expansion to a  75 MeV, 6.7 mA ring with
wigglers for a Free Electron Laser.  The shielding design addressed both chronic
losses for continuous operation and accidental point losses at different points
along the accelerator.  Point losses were readily simulated with a conventional
beam hitting a target.  The continuous loss was simulated using a distributed
source along the length of the e-Linac.  Results of the shielding simulation
will be presented and compared with those from empirical methods.