Advanced Collimator Systems for the NLC

The Next Linear Collider accelerator will include a large (kilometer scale) and complex collimation system. Its size and complexity could be reduced if the collimator jaws were made immune to damage from the electron beam. We describe two collimation systems currently under development. Construction of a prototype system, which uses wheels that can be moved to a new position after damage, is underway. The second system, currently in the R+D phase, will use rotors that are continuously reformed from a bath of liquid metal as the collimation surface. This second system should allow operation at beam intensities that damage the jaws on ever y pulse. We describe results of tests on both systems.