Hendrickson, L.

Paper	Title	Page
THP35	Development of a Non-Magnetic Inertial Sensor for Vibration Stabilization in a Linear Collider	681
	J. Frisch, A. Chang, V. Decker, L. Hendrickson, T. Markiewicz, R. Partridge, A. Seryi SLAC, Menlo Park, California D. Eric, T. Himel SLAC/NLC, Menlo Park, California
	One of the options for controlling vibration of the final focus magnets in a linear collider is to use active feedback based on accelerometers. While commercial geophysics sensors have noise performance that substantially exceeds the requirements for a linear collider, they are physically large, and cannot operate in the strong magnetic field of the detector. Conventional nonmagnetic sensors have excessive noise for this application. We report on the development of a non-magnetic inertial sensor, and on a novel commercial sensor both of which have demonstrated the required noise levels for this application.
	Transparencies
THP36	Vibration Stabilization of a Mechanical Model of a X-Band Linear Collider Final Focus Magnet	684
	J. Frisch, A. Chang, V. Decker, L. Hendrickson, T. Markiewicz, R. Partridge, A. Seryi SLAC, Menlo Park, California E. Eric, L. Eriksson, T. Himel SLAC/NLC, Menlo Park, California
	The small beam sizes at the interaction point of a X-band linear collider require mechanical stabilization of the final focus magnets at the nanometer level. While passive systems provide adequate performance at many potential sites, active mechanical stabilization is useful if the natural or cultural ground vibration is higher than expected. A mechanical model of a room temperature linear collider final focus magnet has been constructed and actively stabilized with an accelerometer based system.
THP37	Approaches to Beam Stabilization in X-Band Linear Colliders	687
	J. Frisch, L. Hendrickson, T. Markiewicz, A. Seryi SLAC, Menlo Park, California P. Burrows, S. Molloy, G. White Queen Mary University of London, London C. Perry OXFORDphysics, Oxford, Oxon T.O. Raubenheimer, T. Thomas SLAC/NLC, Menlo Park, California
	In order to stabilize the beams at the interaction point, the X-band linear collider proposes to use a combination of techniques: inter-train and intra-train beam-beam feedback, passive vibration isolation, and active vibration stabilization based on either accelerometers or laser interferometers. These systems operate in a technologically redundant fashion: simulations indicate that if one technique proves unusable in the final machine, the others will still support adequate luminosity. Experiments underway for all of these technologies, have already demonstrated adequate performance.