Abstract :
The Advanced Photon Source (APS) is a 7-GeV, third-generation synchrotron radiation source. To provide more stable beam for users, we are pursuing a new operating mode called “top-up”. In this mode, the beam current is not allowed to decay as it normally would, but instead is maintained at a high level through frequent injection. A safety question with top-up mode is, during injection with photon shutters open can injected beam ever exit a photon beamline? This might happen, for example, due to full or partial shorting of a dipole coil. Extensive, detailed tracking studies were performed to assess the possibility of such an accident given the planned safety measures. We discuss the safety philosophy, the scenarios simulated, and the advanced computational techniques employed. A companion paper discusses analytical estimates of top-up safety
Keywords :
X-ray production; accidents; beam handling equipment; electron accelerators; high energy physics instrumentation computing; particle beam injection; particle beam stability; safety; storage rings; 7 GeV; APS; Advanced Photon Source; accident; computational techniques; frequent injection; photon beamline; photon shutters; stable beam; third-generation synchrotron radiation source; top-up safety; tracking studies; Accidents; Coils; Computational modeling; Electron beams; Particle beam injection; Performance evaluation; Protons; Radiation safety; Safety devices; Synchrotron radiation;
