Linear collider IR and final focus -- introduction

The Linear Collider subgroup of the Accelerator Physics working group concerned itself with all aspects of the Next Linear Collider (NLC) design from the end of the accelerating structure to and through the interaction region. Within this region are: (1) a collimation section, (2) muon protection (of the detector from the collimator), (3) final focus system, (4) interaction point physics, and (5) detector masking from synchrotron radiation and beam-beam pair production. The parameters for the Next Linear Collider are still in motion, but attention has settled on a handful of parameter sets. Energies under consideration vary from 0.5 to 1.5 TeV in the center of mass, and luminosities vary from 1033 to 1034 cm-2s-1. To be concrete the authors chose as a guide for their studies the parameter sets labeled F and G. These cover large and small crossing angle cases and 0.4 m to 1.8 m of free length at the interaction point