LHC on-line model

The LHC machine will be a very demanding accelerator from a beam control perspective. There are tight constraints on the key beam parameters in the presence of large non-linearities and dynamic persistent current effects. Particle loss in the LHC must be actively minimized to avoid damage to the machine. Therefore any adjustment to the machine parameters would ideally be checked beforehand with a proper modeling tool. The LHC On-Line Model is an attempt to provide such an analysis tool based mainly on the MAD-X code. The goal is not to provide a real-time interactive system to control the LHC, but rather a way to speed up interaction with the power of MAD-X and to facilitate off-line analysis to give results within appropriate time constraints. There will be a rich spectrum of potential applications such as closed orbit correction, beta-beating analysis, optimization of non-linear correction and knob settings. We report the status of the on-line model software which is at present being developed for the beginning of the LHC commissioning.