Thermal modeling of the Tevatron magnet system

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Operation of the Tevatron at lower temperatures, for the purpose of allowing higher energies, has resulted in a renewed interest in thermal modeling of the magnet strings. Static heat load and AC loses in the superconducting coils are initially transported through subcooled liquid helium. Heat exchange between the subcooled liquid and a counter flowing two-phase stream transfers the load to the latent heat. Stratification of the two-phase helium stream has resulted in considerably less heat exchange compared to the original design. Spool pieces have virtually no heat transfer to the two-phase resulting in a ''warm'' dipole just downstream. A model ... continued below

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8 pages

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Theilacker, Jay C. & Klebaner, Arkadiy L. July 20, 2004.

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Description

Operation of the Tevatron at lower temperatures, for the purpose of allowing higher energies, has resulted in a renewed interest in thermal modeling of the magnet strings. Static heat load and AC loses in the superconducting coils are initially transported through subcooled liquid helium. Heat exchange between the subcooled liquid and a counter flowing two-phase stream transfers the load to the latent heat. Stratification of the two-phase helium stream has resulted in considerably less heat exchange compared to the original design. Spool pieces have virtually no heat transfer to the two-phase resulting in a ''warm'' dipole just downstream. A model of the magnet string thermal behavior has been developed. The model has been used to identify temperature profiles within magnet strings. The temperature profiles are being used in conjunction with initial magnet quench performance data to predict the location of quench limiting magnets within the Tevatron. During thermal cycles of magnet strings, the model is being used to ''shuffle'' magnets within the magnet string in order to better match the magnets quench performance with its actual predicted temperature. The motivation for this analysis is to raise the operating energy of the Tevatron using a minimal number of magnets from the spares pool.

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8 pages

Source

  • 2001 Cryogenic Engineering Conference, Madison, WI (US), 07/2001

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  • Report No.: FERMILAB-Conf-01/481-AD
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 826006
  • Archival Resource Key: ark:/67531/metadc788632

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  • July 20, 2004

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  • Dec. 3, 2015, 9:30 a.m.

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  • Aug. 5, 2016, 3:39 p.m.

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Theilacker, Jay C. & Klebaner, Arkadiy L. Thermal modeling of the Tevatron magnet system, article, July 20, 2004; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc788632/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.