A solid-nitrogen cooled Nb3Sn NMR magnet operating in the range 8-10 K

Yukikazu Iwasa, Roger Wheatley, Juan Bascuñán, Benjamin Haid, Haigun Lee

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)


This paper presents a reference design of a solid-nitrogen cooled 300-MHz/25 mm Nb3Sn NMR magnet based on a novel design/operation concept. The magnet operates in the temperature range 8-10 K with its cryocooler thermally decoupled from the magnet and idled. A mass of solid nitrogen in thermal contact with the magnet prolongs the magnet warm-up time to 17 h, during which NMR measurement may be performed under a quiet environment free of the cryocooler's microphonics. At 10 K, the magnet is re-coupled to the cryocooler for recooling to 8 K and ready for another 17-h measurement.

Original languageEnglish
Pages (from-to)1636-1639
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2 II
Publication statusPublished - 2003 Jun
Externally publishedYes
Event2002 Applied Superconductivity Conference - Houston, TX, United States
Duration: 2002 Aug 42002 Aug 9

Bibliographical note

Funding Information:
Manuscript received August 5, 2002. This work was supported by the NIH National Institute for Research Resources. Y. Iwasa and J. Bascuñán are with the MIT Francis Bitter Magnet Laboratory (FBML), Cambridge, MA 02139-4208 USA (e-mail: iwasa@jokaku.mit.edu; bascunan@jokaku.mit.edu). R. Wheatley is with American Magnetics, Inc. (AMI), Oak Ridge, TN 37831-2509 USA (e-mail: rogerw@americanmagnetics.com). B. Haid is with the Lawrence Livermore National Laboratory, Livermore, CA 94551 USA (e-mail: haid1@llnl.gov). H. Lee is with FBML, Cambridge, MA 02139-4208 USA, and also with AMI (e-mail: hlee@jokaku.mit.edu). Digital Object Identifier 10.1109/TASC.2003.812851 Fig. 1. T (t) plots in the range 8–10 K each of 25-liter Cu, solid N Ne with 90 mW heat input.


  • Cryocooler-decoupled operation of a superconducting magnet
  • Solid neon
  • Solid nitrogen

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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