Comparison of the calculated and measured stability of a NbTi cable-in-conduit conductor

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Calculated curves of cable-in-conduit conductor energy stability margins vs. current are compared to experimental curves obtained at Oak Ridge National Laboratory for NbTi single triplex conductors. The conductors ranged in length from 1.8 m to 4.8 m, and had no imposed helium flow. The initiating heat pulse was applied for 16.7 ms over the entire conductor length. The calculated stability curves display the large decrease in energy margin from the low current and high energy margin {open_quotes}well-cooled{close_quotes} stability region, to the high current and low energy margin {open_quotes}ill-cooled{close_quotes} region that was determined experimentally. The calculated {open_quotes}limiting current{close_quotes} of 250 A ... continued below

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6 p.

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Wong, R.L. & Yeaw, C.T. October 13, 1994.

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  • Wong, R.L. Lawrence Livermore National Lab., CA (United States)
  • Yeaw, C.T. Univ. of Wisconsin, Madison, WI (United States). Nuclear Engineering and Engineering Physics

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Description

Calculated curves of cable-in-conduit conductor energy stability margins vs. current are compared to experimental curves obtained at Oak Ridge National Laboratory for NbTi single triplex conductors. The conductors ranged in length from 1.8 m to 4.8 m, and had no imposed helium flow. The initiating heat pulse was applied for 16.7 ms over the entire conductor length. The calculated stability curves display the large decrease in energy margin from the low current and high energy margin {open_quotes}well-cooled{close_quotes} stability region, to the high current and low energy margin {open_quotes}ill-cooled{close_quotes} region that was determined experimentally. The calculated {open_quotes}limiting current{close_quotes} of 250 A (boundary between the ill-cooled and well-cooled regions) also agrees with experiment. The multi-valued stability margins measured for lengths of 3.1 and 3.8 m could not be obtained by the computer model. Excluding the multiple stabilities, the calculated margins are generally 30% lower than the experimental values. The decrease in energy margin in the ill-cooled region was found to be due to the low critical to operating temperature difference (2.2 K at 250 A). This prevents an initiating pulse in the ill-cooled region from being able to generate significant Joule heating without quenching, limiting the energy margin.

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6 p.

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OSTI as DE95007964

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  • Applied superconductivity conference, Boston, MA (United States), 16-21 Oct 1994

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  • Other: DE95007964
  • Report No.: UCRL-JC--116965
  • Report No.: CONF-941013--26
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 26569
  • Archival Resource Key: ark:/67531/metadc671037

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  • October 13, 1994

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  • June 29, 2015, 9:42 p.m.

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  • Feb. 18, 2016, 12:05 p.m.

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Wong, R.L. & Yeaw, C.T. Comparison of the calculated and measured stability of a NbTi cable-in-conduit conductor, article, October 13, 1994; California. (digital.library.unt.edu/ark:/67531/metadc671037/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.