GROUND MOTION STUDIES WITH RESPECT TO LINAC PERFORMANCE

The future TeV linear collider should have extremely small beam emittance to achieve the required luminosity. Precise alignment of focusing and accelerating elements is necessary to prevent emittance dilution. Analysis of ground motion is therefore an essential problem. This paper reviews studies of ground mo-tion, focusing on the effects the in main linac. After recalling results of measurements of ground motion collected at different places, the method based on spectral description of ground mo-tion, which allows prediction of emittance dilution, in presence of orbit correction feedback as well, is discussed