Status of the short dipole model program for the LHC

The model program for the LHC main dipoles is dedicated to the study and va lidation of design variants and assembly parameters to achieve reproducible performance and optimise components and assembly costs. The topics investi gated in the last year include the material of the coil end spacers, the us e of polyimide films from different manufacturers, the definition of optimu m azimuthal and longitudinal coil pre-stress values, shimming of coil ends, collaring around the "cold bore" and different layouts of the yoke ends. T his paper presents the main characteristics of such recent models, the resu lts obtained during cold tests and the plans for the final phase of the mod el program for the LHC dipoles.