The liquid helium thermosyphon for the GEM detector magnet

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The GEM detector magnet, a horizontal solenoid 19.5 m in diameter and wound with a niobium-titanium cable in conduit, will be located with it`s axis 19.5 m below grade. The conductor is wound on the inside of an aluminum bobbin which is cooled by liquid helium which flows by natural convection in a thermosyphon loop from a large storage dewar located at the ground surface. The function of the thermosyphon system is to absorb the environmental heat load as well as any internally generated heat. In the first category is included that heat which is transfered to the magnet by ... continued below

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5 p.

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Warren, R. P. May 4, 1993.

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Description

The GEM detector magnet, a horizontal solenoid 19.5 m in diameter and wound with a niobium-titanium cable in conduit, will be located with it`s axis 19.5 m below grade. The conductor is wound on the inside of an aluminum bobbin which is cooled by liquid helium which flows by natural convection in a thermosyphon loop from a large storage dewar located at the ground surface. The function of the thermosyphon system is to absorb the environmental heat load as well as any internally generated heat. In the first category is included that heat which is transfered to the magnet by way of the mechanical supports, the insulation and the current leads. The internally generated heat includes the resistive heating within the normally conducting conductor splices and the inductive heating of the bobbin during current transients. Though similar systems have been employed elsewhere, there are some unique aspects to the present design. By taking advantage of the large vertical head available, the parallel heat exchanger passes within the magnet remain sub-cooled, thus insuring single phase coolant within the magnet. It is believed that this will be the first instance of such a large vertical head being used to this advantage in a helium system.

Physical Description

5 p.

Notes

OSTI; NTIS; GPO Dep.

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  • 5. annual international industrial symposium on the Super Collider and exhibition,San Francisco, CA (United States),6-8 May 1993

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  • Other: DE93018638
  • Report No.: UCRL-JC--113960
  • Report No.: CONF-930537--92
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 10178362
  • Archival Resource Key: ark:/67531/metadc1339648

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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.

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  • May 4, 1993

Added to The UNT Digital Library

  • Nov. 28, 2018, 2:33 p.m.

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  • Dec. 5, 2018, 7:42 p.m.

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Warren, R. P. The liquid helium thermosyphon for the GEM detector magnet, article, May 4, 1993; California. (digital.library.unt.edu/ark:/67531/metadc1339648/: accessed January 17, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.