VIBRATIONAL STABILITY OF GLC/NLC LINEAR COLLIDER: STATUS AND R& D PLANS

Multiple feedback systems are foreseen to ensure stable luminosity for the X-band linear collider. Beam-based train-by-train steering feedbacks will be used in the linac and at the IP. Active stabilization of the final doublet is being developed to counteract the possibility of excessive vibration from the detector. Another option is fast intra- train feedback that could recover a major part of the luminosity while other systems are being commissioned. An important part of the strategy is to limit vibration of collider components and their contribution to beam jitter.