Construction and test results of a compact 0.8 meter warm bore 1.5-tesla high-homogeneity superconducting magnet for mr-spectroscopy

S. Nenonen, E. Friman, O. Ikkala, S. Islander, H. Seppälä, J. Pekola, A. Sarjala, H. K. Collan

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

A superconducting magnet aimed at whole body MRI and spectroscopic studies was designed, constructed and tested. Magnet was wound with a 2 mm diameter NbTi/Cu multiftlamentary composite conductor. The design field was B o =1.5 T, the design value for field homogeneity AB/B 0 = 0.1 ppm over a 20 cm diameter spherical volume, and the design value for the field stability dB o dt/B o <0.1 ppm/h. During construction of the magnet, special emphasis was put into evaluating the winding accuracy which is attainable in practice. Dimensional measurements on the coil were compared with subsequent field measurements. The magnet was designed to be fully self-protective in the event of a quench. The quench calculations were verified by test quench measurements. The magnet was cooled by immersion in a 300 liter LHe-bath of an annular helium cryostat having an 0.8 m diameter GRP room temperature bore tube, with a 7 I/d LHe boil-off. Constructional and design aspects are discussed and test results are given.

Original languageEnglish
Pages (from-to)637-640
Number of pages4
JournalIEEE Transactions on Magnetics
Volume28
Issue number1
DOIs
Publication statusPublished - Jan 1992
MoE publication typeA1 Journal article-refereed

Keywords

  • high homogeneity magnets
  • NMR spectroscopy
  • superconducting magnets

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