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ground-motion

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MOPCH120 Ground Motion Study and the Related Effects on the J-PARC site, simulation, KEK, beam-losses 327
 
  • S. Takeda, N. Yamamoto, M. Yoshioka
    KEK, Ibaraki
  • Y. Nakayama
    JPOWER, Kanagawa-ken
  The power spectrum density, coherence and cross-spectrum density of the ground motion in the J-PARC site are studied to get the guideline of the beam control systems. J-PARC consists of a 600 MeV linac, a 3 GeV Rapid-cycling synchrotron (RCS) and a 50 GeV synchrotron (MR). MR provides a beam current of 15 micro-A with a period of 3 sec to either the nuclear physics experimental area or the neutrino production target. MR is a very high beam power machine, so its optimum beam loss must be kept fewer than 0.01% of an accelerated beam in order to decrease the radiation damage of accelerator components and to get easy accessibilty to them. From the point of view of beam loss, we give some detailed discussion about the relation between the MR operation and the ground motion using the observed data.  
 
MOPCH121 Ground Motion Measurement at J-PARC site, KEKB, KEK, SLAC 330
 
  • Y. Nakayama, K. Tada
    JPOWER, Kanagawa-ken
  • S. Takeda, M. Yoshioka
    KEK, Ibaraki
  In the next generation accelerator, construction of the machine on the stable ground is preferable for accelerator beam operation. We have measured ground motion at the J-PARC site under construction, where the ground is very close to the Pacific Ocean. In this paper, some of the observed results are shown, comparing the results of the previous observation at some accelerator facilities and next generation accelerator candidate sites in Japan.  
 
MOPLS064 Measurement of Ground Motion in Various Sites site, DESY, LHC, synchrotron 691
 
  • W. Bialowons, R. Amirikas, A. Bertolini, D. Kruecker
    DESY, Hamburg
  This presentation will be an overview of a study program, initiated in DESY, to measure ground vibration of various sites which can be used for site characterization for the International Linear Collider (ILC) design. Commercial broadband seismometers have been used to measure ground motion, correlation and surface wave velocity. The database of measured ground vibrations is available to the scientific community. A parameterization of the spectra will also be presented.  
 
WEPCH140 Recent Improvements of PLACET CLIC, linac, simulation, luminosity 2251
 
  • A. Latina, H. Burkhardt, L. Neukermans, G. Rumolo, D. Schulte, R. Tomas
    CERN, Geneva
  • P. Eliasson
    Uppsala University, Uppsala
  • J. Resta-López
    IFIC, Valencia
  The tracking code PLACET is used to simulate the beam transport in linear colliders from the damping ring to the interaction point and beyond. Recent improvements of the code are presented. They include the possibility to simulate bunch compressors and to use parallel computer systems.  
 
THPLS027 Vibration Measurement at Diamond and the Storage Ring Response DIAMOND, storage-ring, synchrotron, site 3338
 
  • H.C. Huang, J. Kay
    Diamond, Oxfordshire
  Controlling and minimising the sources and transmission of vibration in Synchrotron Light Sources is an important factor in achieving the stability needed to generate the very brightest beams. This paper describes the equipment that has been used at Diamond to measure vibration and reports the results of measurements taken on the accelerator floor and on the girder structures carrying the Storage Ring. A description is given of the intensively piled foundations and a comparison is made between the measured response and the modelled response. The contribution to vibration from water and ventilation services is also discussed.