Simulations of Ip Feedback and Stabilization in the Nlc *

Keeping nanometer-sized beams in collision is an essential component in achieving design luminosity in a linear collider. The NLC stabilization strategy is conservative by including enough redundancy so that if some part does not work to specification or the incoming beam motion is worse than expected, the beams will still be kept in collision. We show simulation results with both realistic and pessimistic assumptions about the response of the ground motion, inertial stabilization, intratrain and intertrain feedback systems. By providing backup systems, and by allowing some systems to perform more poorly than design, it is possible to have a high level of confidence that the beams can be stabilized successfully.