How the Performance of a Superconducting Magnet is affected by theConnection between a small cooler and the Magnet

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As low temperature cryocoolers become more frequently used to cool superconducting magnets, it becomes increasingly apparent that the connection between the cooler and the magnet has an effect on the design and performance of the magnet. In general, the use of small coolers can be considered in two different temperature ranges; (1) from 3.8 to 4.8 K for magnet fabricated with LTS conductor and (2) from 18 to 35 K for magnets fabricated using HTS conductor. In general, both temperature ranges call for the use of a two-stage cooler. The best method for connecting a cooler to the magnet depends ... continued below

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Green, Michael A. September 8, 2005.

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Description

As low temperature cryocoolers become more frequently used to cool superconducting magnets, it becomes increasingly apparent that the connection between the cooler and the magnet has an effect on the design and performance of the magnet. In general, the use of small coolers can be considered in two different temperature ranges; (1) from 3.8 to 4.8 K for magnet fabricated with LTS conductor and (2) from 18 to 35 K for magnets fabricated using HTS conductor. In general, both temperature ranges call for the use of a two-stage cooler. The best method for connecting a cooler to the magnet depends on a number of factors. The factors include: (1) whether the cooler must be used to cool down the magnet from room temperature, (2) whether the magnet must have one or more reservoirs of liquid cryogen to keep the magnet cold during a loss of cooling, and (3) constraints on the distance from the cooler cold heads and the magnet and its shield. Two methods for connecting low temperature coolers to superconducting magnets have been studied. The first method uses a cold strap to connect the cold heads directly to the loads. This method is commonly used for cryogen-free magnets. The second method uses a thermal siphon and liquid cryogens to make the connection between the load being cooled and the cold head. The two methods of transferring heat from the magnet to the cooler low temperature cold head are compared for the two temperature ranges given above.

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  • Journal Name: IEEE Transactions on Applied Superconductivity; Journal Volume: 16; Journal Issue: 1; Related Information: Journal Publication Date: March 2006

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  • Report No.: LBNL--59006
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 917816
  • Archival Resource Key: ark:/67531/metadc889698

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  • September 8, 2005

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  • Sept. 22, 2016, 2:13 a.m.

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  • Sept. 29, 2016, 8:37 p.m.

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Green, Michael A. How the Performance of a Superconducting Magnet is affected by theConnection between a small cooler and the Magnet, article, September 8, 2005; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc889698/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.