Ground motions measurements for synchrotron / D. Ziemiański, M. P. Nowak // W: MEDSI 2016 : Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation, COSMOCAIXA, Science Museum, ... więcej

Ground motions measurements for synchrotron / D. Ziemiański, M. P. Nowak // W: MEDSI 2016 : Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation, COSMOCAIXA, Science Museum, Barcelona, Spain, September 11-16, 2016 -Dokument elektroniczny] / eds. Isidre Costa [et al.]. – [Genewa] : JACoW, 2017. – S. 15-16 : tab., wykr. – Tryb dostępu: http://accelconf.web.cern.ch/AccelConf/medsi2016/papers/proceed.pdf. – Abstr. – doi: 10.18429/JACoW-MEDSI2016-MOPE07. – ISBN 978-3-95450-188-5

For more than two decades, ground vibration measurements were made by different teams for feasibility studies of linear accelerators. Recent measurements were performed in the SPS tunnel and at different ... więcej

For more than two decades, ground vibration measurements were made by different teams for feasibility studies of linear accelerators. Recent measurements were performed in the SPS tunnel and at different CERN sites on the surface. The devices to measure vibrations of magnitude ranging in nanometres, the analysis techniques and the results are critically discussed and compared with the former measurements. The implication of the measured integrated R.M.S. displacements for the Crab cavities cavern are mentioned. The equipment used in this study consists of 2 state-of the-art Guralp broadband triaxial seismometers. Models CMG-T60-0004 (Guralp Systems) performed measurements in three directions V, N/S and E/W. The first analysis was to evaluate the power spectral density for each direction of sensors and event. The power spectral density is calculated from the auto power spectrum. The power spectral density shows a typical curve for the geophones with the micro seismic peak between 0.2 and 0.4 [Hz]. It is important to point that ground vibrations should not be ignored in planning accelerator facility. Actually it is one of the limiting factor in the optimization of future accelerators.