Beam Collimation and Machine-Detector Interface at the International Linear Collider

Synchrotron radiation, beam-gas scattering and beam halo interactions with collimators and other components in the ILC beam delivery system (BDS) would create fluxes of muons and other secondaries which could exceed the tolerable levels at a detector by a few orders of magnitude. It is shown that with a multi-stage collimation system and magnetized iron spoilers which fill the tunnel one can meet the design goals. Results of modeling with the STRUCT [1] and MARS15 [2] codes of beam loss and energy deposition effects are presented in this paper. We focus on the collimation system and mask performance optimization, short-and long-term survivability of the critical components (spoilers, absorbers and magnets), dynamic heat loads and radiation levels in magnets and other components, and machine-related backgrounds in collider detectors.