Reduction of iron saturation in cosine theta dipoles

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A procedure is presented for systematically perturbing the circular iron aperture of a cosine-theta dipole in such a way as to postpone saturation effects up to the point where insufficient iron is present on the midplane. The resulting configuration has little loss in field compared to the alternative procedure of putting a large annulus between the coils and the iron. The necessary saturable iron program used was MDP, but the procedure could be performed with any program. The perturbation functions used to modify the iron shape provide good separation of effects so that only one perturbation per harmonic is needed, ... continued below

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Pages: 4

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Morgan, G. January 1, 1986.

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Description

A procedure is presented for systematically perturbing the circular iron aperture of a cosine-theta dipole in such a way as to postpone saturation effects up to the point where insufficient iron is present on the midplane. The resulting configuration has little loss in field compared to the alternative procedure of putting a large annulus between the coils and the iron. The necessary saturable iron program used was MDP, but the procedure could be performed with any program. The perturbation functions used to modify the iron shape provide good separation of effects so that only one perturbation per harmonic is needed, thus minimizing the amount of computation required. A coil and aperture configuration with low-field harmonic content approaching the stringent RHIC requirements is presented which requires no b/sub 4/ or higher order correction coils up to 4.1 T, with a good field aperture at low field of 32 mm and at 4.1 T, 30 mm. The b/sub 2/ correction required is largest at an intermediate field, and has a maximum amplitude of about -3.2. The transfer function of the configuration is about 2% higher than that of the reference design.

Physical Description

Pages: 4

Notes

NTIS, PC A02/MF A01; 1.

Source

  • International Committee for Future Accelerators workshop on superconducting magnets and cryogenics, Upton, NY, USA, 12 May 1986

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  • Other: DE87003487
  • Report No.: BNL-38974
  • Report No.: CONF-860583-5
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 6853639
  • Archival Resource Key: ark:/67531/metadc1191189

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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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  • January 1, 1986

Added to The UNT Digital Library

  • July 2, 2018, 10:52 p.m.

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  • Nov. 5, 2018, 7:35 p.m.

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Morgan, G. Reduction of iron saturation in cosine theta dipoles, article, January 1, 1986; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc1191189/: accessed March 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.