Inertial sensor development for active vibration stabilization

Future Linear Colliders require nanometer stability of the beams at the interaction point. One approach to stabilising the beams is to use feedback based on inertial sensors (accelerometers/seismometers) to control the positions of the final focus magnets. Commercial seismometers developed for geo-science applications have sufficient noise performance (nanometer noise down to a fraction of a hertz), but due to their large size and magnetic sensitivity are unsuitable for use in a linear collider detector. We report on the development of a high sensitivity, compact, non-magnetic inertial sensor for this application. In addition to its use in linear colliders, the sensor is also expected to have application in vibration measurement and control in synchrotron light sources.