BPM Design and Impedance Considerations for a Rotatable Collimator for the LHC Collimation Upgrade

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The Phase II upgrade to the LHC collimation system calls for complementing the 30 high robust Phase I graphite secondary collimators with 30 high Z Phase II collimators. This paper reports on BPM and impedance considerations and measurements of the integrated BPMs in the prototype rotatable collimator to be installed in the Super Proton Synchrotron (SPS) at CERN. The BPMs are necessary to align the jaws with the beam. Without careful design the beam impedance can result in unacceptable heating of the chamber wall or beam instabilities. The impedance measurements involve utilizing both a single displaced wire and two wires ... continued below

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3 pages

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Smith, Jeffrey Claiborne; /SLAC; Keller, Lewis; /SLAC; Lundgren, Steven; /SLAC et al. August 26, 2010.

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Description

The Phase II upgrade to the LHC collimation system calls for complementing the 30 high robust Phase I graphite secondary collimators with 30 high Z Phase II collimators. This paper reports on BPM and impedance considerations and measurements of the integrated BPMs in the prototype rotatable collimator to be installed in the Super Proton Synchrotron (SPS) at CERN. The BPMs are necessary to align the jaws with the beam. Without careful design the beam impedance can result in unacceptable heating of the chamber wall or beam instabilities. The impedance measurements involve utilizing both a single displaced wire and two wires excited in opposite phase to disentangle the driving and detuning transverse impedances. Trapped mode resonances and longitudinal impedance are to also be measured and compared with simulations. These measurements, when completed, will demonstrate the device is fully operational and has the impedance characteristics and BPM performance acceptable for installation in the SPS.

Physical Description

3 pages

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  • Journal Name: Conf.Proc.C100523:TUPEB079,2010; Conference: 1st International Particle Accelerator Conference: IPAC'10, 23-28 May 2010, Kyoto, Japan

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  • Report No.: SLAC-PUB-14177
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 992948
  • Archival Resource Key: ark:/67531/metadc1014215

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • August 26, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Nov. 2, 2017, 7:30 p.m.

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Smith, Jeffrey Claiborne; /SLAC; Keller, Lewis; /SLAC; Lundgren, Steven; /SLAC et al. BPM Design and Impedance Considerations for a Rotatable Collimator for the LHC Collimation Upgrade, article, August 26, 2010; [California]. (digital.library.unt.edu/ark:/67531/metadc1014215/: accessed November 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.