The effect of flux creep on the magnetization field in the SSC diopole magnets

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The sextuple fields of model SSC dipole magnets have been observed to change with time when the magnets are held at constant current under conditions similar to injection into the SSC accelerator. The changes in the sextupole component have close to a linear log time dependence, and is felt to be caused by flux creep decay of the magnetization currents in the superconductor filaments. Measurements of this decay have been made under various conditions. The conditions include various central field inductions and changes of field prior to when the decay was measured. The measured field decay in the dipole's sextupole ... continued below

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Pages: (9 p)

Creation Information

Gilber, W.S.; Althaus, R.F.; Barale, P.J.; Benjegerdes, R.W.; Green, M.A.; Green, M.I. et al. June 1, 1989.

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Description

The sextuple fields of model SSC dipole magnets have been observed to change with time when the magnets are held at constant current under conditions similar to injection into the SSC accelerator. The changes in the sextupole component have close to a linear log time dependence, and is felt to be caused by flux creep decay of the magnetization currents in the superconductor filaments. Measurements of this decay have been made under various conditions. The conditions include various central field inductions and changes of field prior to when the decay was measured. The measured field decay in the dipole's sextupole is proportional to the magnitude and sign of the sextupole due to magnetization which was measured at the start of the decay. This suggests that the decay is a bulk superconductivity flux creep. Proximity coupling appears to play only a minor role in the flux creep according to recent LBL measurements with a stable power supply. 4 refs., 6 figs., 3 tabs.

Physical Description

Pages: (9 p)

Notes

NTIS, PC A02/MF A01; OSTI; INIS; GPO Dep.

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  • International cryogenic materials conference, Los Angeles, CA (USA), 24-28 Jul 1989

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  • Other: DE90000124
  • Report No.: LBL-26598
  • Report No.: CONF-890701--6
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 5519827
  • Archival Resource Key: ark:/67531/metadc1092291

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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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  • June 1, 1989

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  • Feb. 10, 2018, 10:06 p.m.

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  • April 24, 2018, 7:04 p.m.

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Gilber, W.S.; Althaus, R.F.; Barale, P.J.; Benjegerdes, R.W.; Green, M.A.; Green, M.I. et al. The effect of flux creep on the magnetization field in the SSC diopole magnets, article, June 1, 1989; [Berkeley,] California. (digital.library.unt.edu/ark:/67531/metadc1092291/: accessed April 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.