Hysteresis and saturation effects with the ALS lattice magnets

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The primary purpose of the magnetic measurements performed on the ALS storage ring lattice magnets was to ascertain their compliance with the strict tolerances established for this third-generation synchrotron light source. In the course of the data evaluation, an approximation method has been developed that leads to four-parameter representations of all magnet transfer functions. The expressions for the transfer functions were now used to change the standard working point of the ALS storage ring from the upper to the lower hysteresis branches of all lattice magnet families, and later to ramp the ring from the customary 1.5 GeV to the ... continued below

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5 p.

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Keller, R. April 1, 1995.

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The primary purpose of the magnetic measurements performed on the ALS storage ring lattice magnets was to ascertain their compliance with the strict tolerances established for this third-generation synchrotron light source. In the course of the data evaluation, an approximation method has been developed that leads to four-parameter representations of all magnet transfer functions. The expressions for the transfer functions were now used to change the standard working point of the ALS storage ring from the upper to the lower hysteresis branches of all lattice magnet families, and later to ramp the ring from the customary 1.5 GeV to the maximum design energy of 1.9 GeV in one uninterrupted process that did not require any intermediate tune correction. This achievement is all the more remarkable as no remnant fields had directly been measured with any of these magnets. A specific remnant field effect that led to anomalous machine behavior-when trying to recuperate the betatron tunes on the lower hysteresis branch at standard energy could be ascribed to the C-shape of the quadrupole yokes.

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5 p.

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OSTI as DE95014798

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  • 16. Institute of Electrical and Electronic Engineers (IEEE) particle accelerator conference, Dallas, TX (United States), 1-5 May 1995

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  • Other: DE95014798
  • Report No.: LBL--36444
  • Report No.: CONF-950512--298
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 105865
  • Archival Resource Key: ark:/67531/metadc622885

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  • April 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • April 5, 2016, 10:06 a.m.

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Keller, R. Hysteresis and saturation effects with the ALS lattice magnets, article, April 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc622885/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.