Design for Fermilab main injector magnet ramps which account for hysteresis

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Although the dominant fields in accelerator electromagnets are proportional to the excitation current, precise control of accelerator parameters requires a detailed understanding of the fields in Main Injector magnets including contribution from eddy currents, magnet saturation, and hysteresis. Operation for decelerating beam makes such considerations particularly significant. Analysis of magnet measurements and design of control system software is presented. Field saturation and its effects on low field hysteresis are accounted for in specifying the field ramps for dipole, quadrupole and sextupole magnets. Some simplifying assumptions are made which are accepted as limitations on the required ramp sequences. Specifications are provided ... continued below

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5 p.

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Brown, B.C.; Bhat, C.M.; Harding, D.J.; Martin, P.S. & Wu, G. May 1, 1997.

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Description

Although the dominant fields in accelerator electromagnets are proportional to the excitation current, precise control of accelerator parameters requires a detailed understanding of the fields in Main Injector magnets including contribution from eddy currents, magnet saturation, and hysteresis. Operation for decelerating beam makes such considerations particularly significant. Analysis of magnet measurements and design of control system software is presented. Field saturation and its effects on low field hysteresis are accounted for in specifying the field ramps for dipole, quadrupole and sextupole magnets. Some simplifying assumptions are made which are accepted as limitations on the required ramp sequences. Specifications are provided for relating desired field ramps to required current ramps for the momentum, tune, and chromaticity control.

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5 p.

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INIS; OSTI as DE97053316

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  • 17. IEEE particle accelerator conference, Vancouver (Canada), 12-16 May 1997

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  • Other: DE97053316
  • Report No.: FNAL/C--97/147
  • Report No.: CONF-970503--303
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 555398
  • Archival Resource Key: ark:/67531/metadc691693

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Office of Scientific & Technical Information Technical Reports

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

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • May 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • April 1, 2016, 6:20 p.m.

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Brown, B.C.; Bhat, C.M.; Harding, D.J.; Martin, P.S. & Wu, G. Design for Fermilab main injector magnet ramps which account for hysteresis, article, May 1, 1997; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc691693/: accessed December 12, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.