Beam diagnostic analysis of the accelerator systems commissioning line in the Early Neutron Source Project

This study summarizes the final stage of work done at NCBJ in conjunction with the ongoing large scale International Fusion Materials Facility: Demo Oriented Neutron Source (DONES) project. DONES will be a neutron source with sufficiently high intensity and spectral range of neutrons generated in D-T reactions to enable the generation of structural defects in materials at the level of 20 dpa. Currently existing devices cannot achieve these properties. Our work optimized proton and deuteron beam delivery from a commissioned quadruple accelerator to the entry point of a planned high energy beam transport (HEBT) section in the DONES system. We considered two variants: a beam led by solenoids and a beam led by quadruples. Additional specifications required the insertion of a diagnostic plate that could not be separated by any other component, such us a solenoid or a quadruple. Using beam dynamics calculations, we delivered each beam from the radio frequency quadruple (RFQ) section to the entrance of HEBT section with the goal of minimizing any possible beam losses. We used TraceWin code developed by CEA Saclay for linear and non-linear, 2D or 3D, charged particle beam dynamics calculations and optimization of beam parameters. Based on the performed calculations and optimizations we recommended implementing a commissioning line with solenoids as leading elements.