Investigation of passive vibration damping methods for the Advanced Photon Source storage ring girders.

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Beam stability is a major concern for the operation of the APS. One of the many contributing factors to electron-beam instability is mechanical vibration of the accelerator components especially the focusing magnets. The electron beam should be stable to 5% of its rms size to maintain the specified photon beam stability. The APS uses steel girders to support the conventional magnets and vacuum chambers in the storage ring (SR). Three pedestal and jack assemblies support the girders. Damping pads are presently installed between the pedestals and the jacks. These damping pads have been shown to be very effective in reducing ... continued below

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7 pages

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Sharma, S. & Doose, C. September 11, 2002.

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Description

Beam stability is a major concern for the operation of the APS. One of the many contributing factors to electron-beam instability is mechanical vibration of the accelerator components especially the focusing magnets. The electron beam should be stable to 5% of its rms size to maintain the specified photon beam stability. The APS uses steel girders to support the conventional magnets and vacuum chambers in the storage ring (SR). Three pedestal and jack assemblies support the girders. Damping pads are presently installed between the pedestals and the jacks. These damping pads have been shown to be very effective in reducing the fundamental girder-vibration mode. The horizontal vibration levels of the SR quadrupole magnets are presently within specification at between two and four times the ground motion, i.e., 50-100 nm rms (4-50 Hz). Future improvements to the APS beam quality would require a further reduction in girder vibration. Several options for reducing the vibration of the girders and magnets are discussed, and the measurement results are presented.

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7 pages

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  • 2nd International Workshop on Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation (MEDSI 2002), Argonne, IL (US), 09/05/2002--09/06/2002

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  • Report No.: ANL/XFD/CP-107674
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 801619
  • Archival Resource Key: ark:/67531/metadc736351

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  • September 11, 2002

Added to The UNT Digital Library

  • Oct. 19, 2015, 7:39 p.m.

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  • March 25, 2016, 12:01 p.m.

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Sharma, S. & Doose, C. Investigation of passive vibration damping methods for the Advanced Photon Source storage ring girders., article, September 11, 2002; Illinois. (digital.library.unt.edu/ark:/67531/metadc736351/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.