Ramp-rate sensitivity of SSC dipole magnet prototypes

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One of the major achievements of the magnet R&D program for the Superconducting Super Collider (SSC) is the fabrication and test of a series of 20 5-cm aperture, 15-m long dipole magnet prototypes. The ramp rate sensitivity of these magnets appears to fall in at least two categories that can be correlated to the manufacturer and production batch of the strands used for the inner-coil cables. The first category, referred to as type-A, is characterized by a strong quench current degradation at high ramp rates, usually accompanied by large distortions of the multipole fields and large energy losses. The second ... continued below

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129 p.

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Devred, A. & Ogitsu, T. July 1, 1994.

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Description

One of the major achievements of the magnet R&D program for the Superconducting Super Collider (SSC) is the fabrication and test of a series of 20 5-cm aperture, 15-m long dipole magnet prototypes. The ramp rate sensitivity of these magnets appears to fall in at least two categories that can be correlated to the manufacturer and production batch of the strands used for the inner-coil cables. The first category, referred to as type-A, is characterized by a strong quench current degradation at high ramp rates, usually accompanied by large distortions of the multipole fields and large energy losses. The second category, referred to as type-B, is characterized by a sudden drop of quench current at low ramp rates, followed by a much milder degradation at larger rates. The multipole fields of the type-B magnets show little ramp-rate sensitivity, and the energy losses are smaller than for the type-A magnets. The behavior of the Type-A magnets can be explained in terms of inter-strand eddy currents arising from low and non-uniform resistances at the crossovers between the strands of the two-layer Rutherford-type cable. Anomalies in the transport-current repartition among the cable strands are suggested as a possible cause for the type-B behavior. The origins of these anomalies have not yet been clearly identified. The SSC project was canceled by decision of the United States Congress on October 21, 1994.

Physical Description

129 p.

Notes

INIS; OSTI as DE95011162

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  • Other Information: PBD: Jul 1994

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  • Other: DE95011162
  • Report No.: SSCL-Preprint--568
  • Grant Number: AC35-89ER40486
  • DOI: 10.2172/71687 | External Link
  • Office of Scientific & Technical Information Report Number: 71687
  • Archival Resource Key: ark:/67531/metadc708773

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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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  • July 1, 1994

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 29, 2016, 5:54 p.m.

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Devred, A. & Ogitsu, T. Ramp-rate sensitivity of SSC dipole magnet prototypes, report, July 1, 1994; Dallas, Texas. (digital.library.unt.edu/ark:/67531/metadc708773/: accessed April 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.